Unpacking Software Livestream

Join our monthly Unpacking Software livestream to hear about the latest news, chat and opinion on packaging, software deployment and lifecycle management!

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Chocolatey Product Spotlight

Join the Chocolatey Team on our regular monthly stream where we put a spotlight on the most recent Chocolatey product releases. You'll have a chance to have your questions answered in a live Ask Me Anything format.

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Chocolatey Coding Livestream

Join us for the Chocolatey Coding Livestream, where members of our team dive into the heart of open source development by coding live on various Chocolatey projects. Tune in to witness real-time coding, ask questions, and gain insights into the world of package management. Don't miss this opportunity to engage with our team and contribute to the future of Chocolatey!

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Calling All Chocolatiers! Whipping Up Windows Automation with Chocolatey Central Management

Webinar from
Wednesday, 17 January 2024

We are delighted to announce the release of Chocolatey Central Management v0.12.0, featuring seamless Deployment Plan creation, time-saving duplications, insightful Group Details, an upgraded Dashboard, bug fixes, user interface polishing, and refined documentation. As an added bonus we'll have members of our Solutions Engineering team on-hand to dive into some interesting ways you can leverage the new features available!

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Chocolatey Community Coffee Break

Join the Chocolatey Team as we discuss all things Community, what we do, how you can get involved and answer your Chocolatey questions.

Watch The Replays
Chocolatey and Intune Overview

Webinar Replay from
Wednesday, 30 March 2022

At Chocolatey Software we strive for simple, and teaching others. Let us teach you just how simple it could be to keep your 3rd party applications updated across your devices, all with Intune!

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Chocolatey For Business. In Azure. In One Click.

Livestream from
Thursday, 9 June 2022

Join James and Josh to show you how you can get the Chocolatey For Business recommended infrastructure and workflow, created, in Azure, in around 20 minutes.

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The Future of Chocolatey CLI

Livestream from
Thursday, 04 August 2022

Join Paul and Gary to hear more about the plans for the Chocolatey CLI in the not so distant future. We'll talk about some cool new features, long term asks from Customers and Community and how you can get involved!

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Hacktoberfest Tuesdays 2022

Livestreams from
October 2022

For Hacktoberfest, Chocolatey ran a livestream every Tuesday! Re-watch Cory, James, Gary, and Rain as they share knowledge on how to contribute to open-source projects such as Chocolatey CLI.

Watch On-Demand

Downloads:

186,801

Downloads of v 1.79.2:

175

Last Update:

19 Sep 2024

Package Maintainer(s):

Software Author(s):

  • Natalie Weizenbaum

Tags:

css preprocessor style sass

Sass

This is not the latest version of Sass available.

  • 1
  • 2
  • 3

1.79.2 | Updated: 19 Sep 2024

Downloads:

186,801

Downloads of v 1.79.2:

175

Maintainer(s):

Software Author(s):

  • Natalie Weizenbaum

Sass 1.79.2

This is not the latest version of Sass available.

Legal Disclaimer: Neither this package nor Chocolatey Software, Inc. are affiliated with or endorsed by Natalie Weizenbaum. The inclusion of Natalie Weizenbaum trademark(s), if any, upon this webpage is solely to identify Natalie Weizenbaum goods or services and not for commercial purposes.

  • 1
  • 2
  • 3

This Package Contains an Exempted Check

Not All Tests Have Passed


Validation Testing Passed


Verification Testing Exemption:

This is failing verification because it depends on a pre-release package, and is broken by https://github.com/chocolatey/choco/issues/1575. Please exempt it from verification until there's a stable version of Dart 2 that it can use.

Details

Scan Testing Successful:

No detections found in any package files

Details
Learn More

Deployment Method: Individual Install, Upgrade, & Uninstall

To install Sass, run the following command from the command line or from PowerShell:

>

To upgrade Sass, run the following command from the command line or from PowerShell:

>

To uninstall Sass, run the following command from the command line or from PowerShell:

>

Deployment Method:

NOTE

This applies to both open source and commercial editions of Chocolatey.

1. Enter Your Internal Repository Url

(this should look similar to https://community.chocolatey.org/api/v2/)


2. Setup Your Environment

1. Ensure you are set for organizational deployment

Please see the organizational deployment guide

2. Get the package into your environment

  • Open Source or Commercial:
    • Proxy Repository - Create a proxy nuget repository on Nexus, Artifactory Pro, or a proxy Chocolatey repository on ProGet. Point your upstream to https://community.chocolatey.org/api/v2/. Packages cache on first access automatically. Make sure your choco clients are using your proxy repository as a source and NOT the default community repository. See source command for more information.
    • You can also just download the package and push it to a repository Download

3. Copy Your Script

choco upgrade sass -y --source="'INTERNAL REPO URL'" --version="'1.79.2'" [other options]

See options you can pass to upgrade.

See best practices for scripting.

Add this to a PowerShell script or use a Batch script with tools and in places where you are calling directly to Chocolatey. If you are integrating, keep in mind enhanced exit codes.

If you do use a PowerShell script, use the following to ensure bad exit codes are shown as failures:


choco upgrade sass -y --source="'INTERNAL REPO URL'" --version="'1.79.2'" 
$exitCode = $LASTEXITCODE

Write-Verbose "Exit code was $exitCode"
$validExitCodes = @(0, 1605, 1614, 1641, 3010)
if ($validExitCodes -contains $exitCode) {
  Exit 0
}

Exit $exitCode

- name: Install sass
  win_chocolatey:
    name: sass
    version: '1.79.2'
    source: INTERNAL REPO URL
    state: present

See docs at https://docs.ansible.com/ansible/latest/modules/win_chocolatey_module.html.


chocolatey_package 'sass' do
  action    :install
  source   'INTERNAL REPO URL'
  version  '1.79.2'
end

See docs at https://docs.chef.io/resource_chocolatey_package.html.


cChocoPackageInstaller sass
{
    Name     = "sass"
    Version  = "1.79.2"
    Source   = "INTERNAL REPO URL"
}

Requires cChoco DSC Resource. See docs at https://github.com/chocolatey/cChoco.


package { 'sass':
  ensure   => '1.79.2',
  provider => 'chocolatey',
  source   => 'INTERNAL REPO URL',
}

Requires Puppet Chocolatey Provider module. See docs at https://forge.puppet.com/puppetlabs/chocolatey.


4. If applicable - Chocolatey configuration/installation

See infrastructure management matrix for Chocolatey configuration elements and examples.

WARNING

There are versions of this package awaiting moderation . See the Version History section below.

Package Approved

This package was approved as a trusted package on 19 Sep 2024.

Description

Sass makes CSS fun again. Sass is an extension of CSS, adding nested rules, variables, mixins, selector inheritance, and more. It's translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.

This package is Dart Sass, the new Dart implementation of Sass.


tools\chocolateyInstall.ps1
$ToolsDir = (Split-Path -parent $MyInvocation.MyCommand.Definition)
Write-Host "Fetching Dart dependencies..."
$SourceDir = "$ToolsDir\source"
Push-Location -Path $SourceDir
dart pub get --no-precompile | Out-Null
Pop-Location

New-Item -Path $PackageFolder -Name "bin" -ItemType "directory" | Out-Null
Write-Host "Building executable..."
$ExePath = "$PackageFolder\bin\sass.exe"
dart compile exe '"-Dversion=1.79.2"' '"-Ddart-version=3.5.3"' '"-Dprotocol-version=3.0.0"' '"-Dcompiler-version=1.79.2"' "$SourceDir\bin/sass.dart" -o $ExePath
Generate-BinFile "sass" $ExePath
tools\chocolateyUninstall.ps1
Remove-BinFile "sass" "$PackageFolder\bin\sass.exe"
tools\LICENSE.txt
Dart Sass license:

Copyright (c) 2016, Google Inc.

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


--------------------------------------------------------------------------------

Dart SDK license:

Copyright 2012, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

_fe_analyzer_shared license:

Copyright 2019, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

_macros and macros license:

Copyright 2024, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

analyzer, protobuf and protoc_plugin license:

Copyright 2013, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

archive license:

The MIT License

Copyright (c) 2013-2021 Brendan Duncan.
All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

--------------------------------------------------------------------------------

args, csslib and logging license:

Copyright 2013, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

async, cli_util, collection, mime, stream_channel and typed_data license:

Copyright 2015, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

boolean_selector, meta and shelf_packages_handler license:

Copyright 2016, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

charcode license:

Copyright 2014, the Dart project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google Inc. nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

checked_yaml license:

Copyright 2019, the Dart project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google Inc. nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

cli_pkg license:

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
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cli_repl license:

Copyright (c) 2018, Jennifer Thakar.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the project nor the names of its contributors may be
      used to endorse or promote products derived from this software without
      specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


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convert, crypto, shelf_static, source_map_stack_trace and vm_service license:

Copyright 2015, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

coverage, dart_style, dartdoc, glob, http, http_parser, matcher, path, pool,
pub_semver, source_span, string_scanner, test and watcher license:

Copyright 2014, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

dart_mappable and type_plus license:

MIT License

Copyright (c) 2021 Kilian Schulte

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

--------------------------------------------------------------------------------

ffi and package_config license:

Copyright 2019, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

file license:

Copyright 2017, the Dart project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google Inc. nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

--------------------------------------------------------------------------------

fixnum, http_multi_server, oauth2, shelf, shelf_web_socket, source_maps and
stack_trace license:

Copyright 2014, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

frontend_server_client license:

Copyright 2020, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

grinder and webkit_inspection_protocol license:

Copyright 2013, Google Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
    * Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

html license:

Copyright (c) 2006-2012 The Authors

Contributors:
James Graham - [email protected]
Anne van Kesteren - [email protected]
Lachlan Hunt - [email protected]
Matt McDonald - [email protected]
Sam Ruby - [email protected]
Ian Hickson (Google) - [email protected]
Thomas Broyer - [email protected]
Jacques Distler - [email protected]
Henri Sivonen - [email protected]
Adam Barth - [email protected]
Eric Seidel - [email protected]
The Mozilla Foundation (contributions from Henri Sivonen since 2008)
David Flanagan (Mozilla) - [email protected]
Google LLC (contributed the Dart port) - [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


--------------------------------------------------------------------------------

io, stream_transform and term_glyph license:

Copyright 2017, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

js license:

Copyright 2012, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

json_annotation license:

Copyright 2017, the Dart project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google Inc. nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

lints license:

Copyright 2021, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

markdown license:

Copyright 2012, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

native_stack_traces license:

Copyright 2020, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

native_synchronization license:

Copyright 2023, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

node_interop license:

Copyright (c) 2017, Anatoly Pulyaevskiy.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the <organization> nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

node_preamble license:

The MIT License (MIT)

Copyright (c) 2015 Michael Bullington

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

===

Copyright 2012, the Dart project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google Inc. nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


--------------------------------------------------------------------------------

petitparser and xml license:

The MIT License

Copyright (c) 2006-2023 Lukas Renggli.
All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.


--------------------------------------------------------------------------------

pub_api_client license:

MIT License

Copyright (c) 2020 Leo Farias

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


--------------------------------------------------------------------------------

pubspec license:

Copyright (c) 2015, Anders Holmgren.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the <organization> nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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--------------------------------------------------------------------------------

pubspec_parse license:

Copyright 2018, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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quiver and retry license:


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test_api and test_core license:

Copyright 2018, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
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    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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test_descriptor and web_socket_channel license:

Copyright 2016, the Dart project authors. 

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
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    * Redistributions of source code must retain the above copyright
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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test_process license:

Copyright 2017, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
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    * Neither the name of Google LLC nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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uri license:

Copyright 2013, the Dart project authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
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      notice, this list of conditions and the following disclaimer.
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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web license:

Copyright 2023, the Dart project authors.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
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web_socket license:

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      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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yaml license:

Copyright (c) 2014, the Dart project authors.
Copyright (c) 2006, Kirill Simonov.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
tools\source\bin\sass.dart
 
tools\source\lib\sass.dart
 
tools\source\lib\src\ast\css.dart
 
tools\source\lib\src\ast\css\at_rule.dart
 
tools\source\lib\src\ast\css\comment.dart
 
tools\source\lib\src\ast\css\declaration.dart
 
tools\source\lib\src\ast\css\import.dart
 
tools\source\lib\src\ast\css\keyframe_block.dart
 
tools\source\lib\src\ast\css\media_query.dart
 
tools\source\lib\src\ast\css\media_rule.dart
 
tools\source\lib\src\ast\css\modifiable.dart
 
tools\source\lib\src\ast\css\modifiable\at_rule.dart
 
tools\source\lib\src\ast\css\modifiable\comment.dart
 
tools\source\lib\src\ast\css\modifiable\declaration.dart
 
tools\source\lib\src\ast\css\modifiable\import.dart
 
tools\source\lib\src\ast\css\modifiable\keyframe_block.dart
 
tools\source\lib\src\ast\css\modifiable\media_rule.dart
 
tools\source\lib\src\ast\css\modifiable\node.dart
 
tools\source\lib\src\ast\css\modifiable\stylesheet.dart
 
tools\source\lib\src\ast\css\modifiable\style_rule.dart
 
tools\source\lib\src\ast\css\modifiable\supports_rule.dart
 
tools\source\lib\src\ast\css\node.dart
 
tools\source\lib\src\ast\css\README.md
# CSS Abstract Syntax Tree

This directory contains the abstract syntax tree that represents a plain CSS
file generated by Sass compilation. It differs from other Sass ASTs in two major
ways:

1. Instead of being created by [a parser], it's created by [the evaluator] as it
   traverses the [Sass AST].

   [a parser]: ../../parse/README.md
   [the evaluator]: ../../visitor/async_evaluate.dart
   [Sass AST]: ../sass/README.md

2. Because of various Sass features like `@extend` and at-rule hoisting, the CSS
   AST is mutable even though all other ASTs are immutable.

**Note:** the CSS AST doesn't have its own representation of declaration values.
Instead, declaration values are represented as [`Value`] objects. This does mean
that a CSS AST can be in a state where some of its values aren't representable
in plain CSS (such as maps)—in this case, [the serializer] will emit an error.

[`Value`]: ../../value/README.md
[the serializer]: ../../visitor/serialize.dart

## Mutable and Immutable Views

Internally, the CSS AST is mutable to allow for operations like hoisting rules
to the root of the AST and updating existing selectors when `@extend` rules are
encountered. However, because mutability poses a high risk for "spooky [action
at a distance]", we limit access to mutating APIs exclusively to the evaluator.

[action at a distance]: https://en.wikipedia.org/wiki/Action_at_a_distance_(computer_programming)

We do this by having an _unmodifiable_ interface (written in this directory) for
each CSS AST node which only exposes members that don't modify the node in
question. The implementations of those interfaces, which _do_ have modifying
methods, live in the [`modifiable`] directory. We then universally refer to the
immutable node interfaces except specifically in the evaluator, and the type
system automatically ensures we don't accidentally mutate anything we don't
intend to.

[`modifiable`]: modifiable

(Of course, it's always possible to cast an immutable node type to a mutable
one, but that's a very clear code smell that a reviewer can easily identify.)

## CSS Source Files

A lesser-known fact about Sass is that it actually supports _three_ syntaxes for
its source files: SCSS, the indented syntax, and plain CSS. But even when it
parses plain CSS, it uses the Sass AST rather than the CSS AST to represent it
so that parsing logic can easily be shared with the other stylesheet parsers.
tools\source\lib\src\ast\css\stylesheet.dart
 
tools\source\lib\src\ast\css\style_rule.dart
 
tools\source\lib\src\ast\css\supports_rule.dart
 
tools\source\lib\src\ast\css\value.dart
 
tools\source\lib\src\ast\node.dart
 
tools\source\lib\src\ast\sass.dart
 
tools\source\lib\src\ast\sass\argument.dart
 
tools\source\lib\src\ast\sass\argument_declaration.dart
 
tools\source\lib\src\ast\sass\argument_invocation.dart
 
tools\source\lib\src\ast\sass\at_root_query.dart
 
tools\source\lib\src\ast\sass\callable_invocation.dart
 
tools\source\lib\src\ast\sass\configured_variable.dart
 
tools\source\lib\src\ast\sass\declaration.dart
 
tools\source\lib\src\ast\sass\dependency.dart
 
tools\source\lib\src\ast\sass\expression.dart
 
tools\source\lib\src\ast\sass\expression\binary_operation.dart
 
tools\source\lib\src\ast\sass\expression\boolean.dart
 
tools\source\lib\src\ast\sass\expression\color.dart
 
tools\source\lib\src\ast\sass\expression\function.dart
 
tools\source\lib\src\ast\sass\expression\if.dart
 
tools\source\lib\src\ast\sass\expression\interpolated_function.dart
 
tools\source\lib\src\ast\sass\expression\list.dart
 
tools\source\lib\src\ast\sass\expression\map.dart
 
tools\source\lib\src\ast\sass\expression\null.dart
 
tools\source\lib\src\ast\sass\expression\number.dart
 
tools\source\lib\src\ast\sass\expression\parenthesized.dart
 
tools\source\lib\src\ast\sass\expression\selector.dart
 
tools\source\lib\src\ast\sass\expression\string.dart
 
tools\source\lib\src\ast\sass\expression\supports.dart
 
tools\source\lib\src\ast\sass\expression\unary_operation.dart
 
tools\source\lib\src\ast\sass\expression\value.dart
 
tools\source\lib\src\ast\sass\expression\variable.dart
 
tools\source\lib\src\ast\sass\import.dart
 
tools\source\lib\src\ast\sass\import\dynamic.dart
 
tools\source\lib\src\ast\sass\import\static.dart
 
tools\source\lib\src\ast\sass\interpolation.dart
 
tools\source\lib\src\ast\sass\node.dart
 
tools\source\lib\src\ast\sass\README.md
# Sass Abstract Syntax Tree

This directory contains the abstract syntax tree that represents a Sass source
file, regardless of which syntax it was written in (SCSS, the indented syntax,
or plain CSS). The AST is constructed recursively by [a parser] from the leaf
nodes in towards the root, which allows it to be fully immutable.

[a parser]: ../../parse/README.md

The Sass AST is broken up into three categories:

1. The [statement AST], which represents statement-level constructs like
   variable assignments, style rules, and at-rules.

   [statement AST]: statement

2. The [expression AST], which represents SassScript expressions like function
   calls, operations, and value literals.

   [expression AST]: exprssion

3. Miscellaneous AST nodes that are used by both statements and expressions or
   don't fit cleanly into either category that live directly in this directory.

The Sass AST nodes are processed (usually from the root [`Stylesheet`]) by [the
evaluator], which runs the logic they encode and builds up a [CSS AST] that
represents the compiled stylesheet. They can also be transformed back into Sass
source using the `toString()` method. Since this is only ever used for debugging
and doesn't need configuration or full-featured indentation tracking, it doesn't
use a full visitor.

[`Stylesheet`]: statement/stylesheet.dart
[the evaluator]: ../../visitor/async_evaluate.dart
[CSS AST]: ../css/README.md
tools\source\lib\src\ast\sass\reference.dart
 
tools\source\lib\src\ast\sass\statement.dart
 
tools\source\lib\src\ast\sass\statement\at_root_rule.dart
 
tools\source\lib\src\ast\sass\statement\at_rule.dart
 
tools\source\lib\src\ast\sass\statement\callable_declaration.dart
 
tools\source\lib\src\ast\sass\statement\content_block.dart
 
tools\source\lib\src\ast\sass\statement\content_rule.dart
 
tools\source\lib\src\ast\sass\statement\debug_rule.dart
 
tools\source\lib\src\ast\sass\statement\declaration.dart
 
tools\source\lib\src\ast\sass\statement\each_rule.dart
 
tools\source\lib\src\ast\sass\statement\error_rule.dart
 
tools\source\lib\src\ast\sass\statement\extend_rule.dart
 
tools\source\lib\src\ast\sass\statement\forward_rule.dart
 
tools\source\lib\src\ast\sass\statement\for_rule.dart
 
tools\source\lib\src\ast\sass\statement\function_rule.dart
 
tools\source\lib\src\ast\sass\statement\if_rule.dart
 
tools\source\lib\src\ast\sass\statement\import_rule.dart
 
tools\source\lib\src\ast\sass\statement\include_rule.dart
 
tools\source\lib\src\ast\sass\statement\loud_comment.dart
 
tools\source\lib\src\ast\sass\statement\media_rule.dart
 
tools\source\lib\src\ast\sass\statement\mixin_rule.dart
 
tools\source\lib\src\ast\sass\statement\parent.dart
 
tools\source\lib\src\ast\sass\statement\return_rule.dart
 
tools\source\lib\src\ast\sass\statement\silent_comment.dart
 
tools\source\lib\src\ast\sass\statement\stylesheet.dart
 
tools\source\lib\src\ast\sass\statement\style_rule.dart
 
tools\source\lib\src\ast\sass\statement\supports_rule.dart
 
tools\source\lib\src\ast\sass\statement\use_rule.dart
 
tools\source\lib\src\ast\sass\statement\variable_declaration.dart
 
tools\source\lib\src\ast\sass\statement\warn_rule.dart
 
tools\source\lib\src\ast\sass\statement\while_rule.dart
 
tools\source\lib\src\ast\sass\supports_condition.dart
 
tools\source\lib\src\ast\sass\supports_condition\anything.dart
 
tools\source\lib\src\ast\sass\supports_condition\declaration.dart
 
tools\source\lib\src\ast\sass\supports_condition\function.dart
 
tools\source\lib\src\ast\sass\supports_condition\interpolation.dart
 
tools\source\lib\src\ast\sass\supports_condition\negation.dart
 
tools\source\lib\src\ast\sass\supports_condition\operation.dart
 
tools\source\lib\src\ast\selector.dart
 
tools\source\lib\src\ast\selector\attribute.dart
 
tools\source\lib\src\ast\selector\class.dart
 
tools\source\lib\src\ast\selector\combinator.dart
 
tools\source\lib\src\ast\selector\complex.dart
 
tools\source\lib\src\ast\selector\complex_component.dart
 
tools\source\lib\src\ast\selector\compound.dart
 
tools\source\lib\src\ast\selector\id.dart
 
tools\source\lib\src\ast\selector\list.dart
 
tools\source\lib\src\ast\selector\parent.dart
 
tools\source\lib\src\ast\selector\placeholder.dart
 
tools\source\lib\src\ast\selector\pseudo.dart
 
tools\source\lib\src\ast\selector\qualified_name.dart
 
tools\source\lib\src\ast\selector\README.md
# Selector Abstract Syntax Tree

This directory contains the abstract syntax tree that represents a parsed CSS
selector. This AST is constructed recursively by [the selector parser]. It's
fully immutable.

[the selector parser]: ../../parse/selector.dart

Unlike the [Sass AST], which is parsed from a raw source string before being
evaluated, the selector AST is parsed _during evaluation_. This is necessary to
ensure that there's a chance to resolve interpolation before fully parsing the
selectors in question.

[Sass AST]: ../sass/README.md

Although this AST doesn't include any SassScript, it _does_ include a few
Sass-specific constructs: the [parent selector] `&` and [placeholder selectors].
Parent selectors are resolved by [the evaluator] before it hands the AST off to
[the serializer], while placeholders are omitted in the serializer itself.

[parent selector]: parent.dart
[placeholder selectors]: placeholder.dart
[the evaluator]: ../../visitor/async_evaluate.dart
[the serializer]: ../../visitor/serialize.dart
tools\source\lib\src\ast\selector\simple.dart
 
tools\source\lib\src\ast\selector\type.dart
 
tools\source\lib\src\ast\selector\universal.dart
 
tools\source\lib\src\async_compile.dart
 
tools\source\lib\src\async_environment.dart
 
tools\source\lib\src\async_import_cache.dart
 
tools\source\lib\src\callable.dart
 
tools\source\lib\src\callable\async.dart
 
tools\source\lib\src\callable\async_built_in.dart
 
tools\source\lib\src\callable\built_in.dart
 
tools\source\lib\src\callable\plain_css.dart
 
tools\source\lib\src\callable\user_defined.dart
 
tools\source\lib\src\color_names.dart
 
tools\source\lib\src\compile.dart
 
tools\source\lib\src\compile_result.dart
 
tools\source\lib\src\configuration.dart
 
tools\source\lib\src\configured_value.dart
 
tools\source\lib\src\deprecation.dart
 
tools\source\lib\src\embedded\compilation_dispatcher.dart
 
tools\source\lib\src\embedded\embedded_sass.pb.dart
 
tools\source\lib\src\embedded\embedded_sass.pbenum.dart
 
tools\source\lib\src\embedded\embedded_sass.pbjson.dart
 
tools\source\lib\src\embedded\embedded_sass.pbserver.dart
 
tools\source\lib\src\embedded\executable.dart
 
tools\source\lib\src\embedded\host_callable.dart
 
tools\source\lib\src\embedded\importer\base.dart
 
tools\source\lib\src\embedded\importer\file.dart
 
tools\source\lib\src\embedded\importer\host.dart
 
tools\source\lib\src\embedded\isolate_dispatcher.dart
 
tools\source\lib\src\embedded\logger.dart
 
tools\source\lib\src\embedded\opaque_registry.dart
 
tools\source\lib\src\embedded\protofier.dart
 
tools\source\lib\src\embedded\README.md
# Embedded Sass Compiler

This directory contains the Dart Sass embedded compiler. This is a special mode
of the Dart Sass command-line executable, only supported on the Dart VM, in
which it uses stdin and stdout to communicate with another endpoint, the
"embedded host", using a protocol buffer-based protocol. See [the embedded
protocol specification] for details.

[the embedded protocol specification]: https://github.com/sass/sass/blob/main/spec/embedded-protocol.md

The embedded compiler has two different levels of dispatchers for handling
incoming messages from the embedded host:

1. The [`IsolateDispatcher`] is the first recipient of each packet. It decodes
   the packets _just enough_ to determine which compilation they belong to, and
   forwards them to the appropriate compilation dispatcher. It also parses and
   handles messages that aren't compilation specific, such as `VersionRequest`.

   [`IsolateDispatcher`]: isolate_dispatcher.dart

2. The [`CompilationDispatcher`] fully parses and handles messages for a single
   compilation. Each `CompilationDispatcher` runs in a separate isolate so that
   the embedded compiler can run multiple compilations in parallel.

   [`CompilationDispatcher`]: compilation_dispatcher.dart

Otherwise, most of the code in this directory just wraps Dart APIs to
communicate with their protocol buffer equivalents.
tools\source\lib\src\embedded\reusable_isolate.dart
 
tools\source\lib\src\embedded\unavailable.dart
 
tools\source\lib\src\embedded\util\length_delimited_transformer.dart
 
tools\source\lib\src\embedded\util\proto_extensions.dart
 
tools\source\lib\src\embedded\util\varint_builder.dart
 
tools\source\lib\src\embedded\utils.dart
 
tools\source\lib\src\environment.dart
 
tools\source\lib\src\evaluation_context.dart
 
tools\source\lib\src\exception.dart
 
tools\source\lib\src\executable\compile_stylesheet.dart
 
tools\source\lib\src\executable\concurrent.dart
 
tools\source\lib\src\executable\concurrent\js.dart
 
tools\source\lib\src\executable\concurrent\vm.dart
 
tools\source\lib\src\executable\options.dart
 
tools\source\lib\src\executable\repl.dart
 
tools\source\lib\src\executable\watch.dart
 
tools\source\lib\src\extend\empty_extension_store.dart
 
tools\source\lib\src\extend\extension.dart
 
tools\source\lib\src\extend\extension_store.dart
 
tools\source\lib\src\extend\functions.dart
 
tools\source\lib\src\extend\merged_extension.dart
 
tools\source\lib\src\extend\mode.dart
 
tools\source\lib\src\extend\README.md
# `@extend` Logic

This directory contains most of the logic for running Sass's `@extend` rule.
This rule is probably the most complex corner of the Sass language, since it
involves both understanding the semantics of selectors _and_ being able to
combine them.

The high-level lifecycle of extensions is as follows:

1. When [the evaluator] encounters a style rule, it registers its selector in
   the [`ExtensionStore`] for the current module. This applies any extensions
   that have already been registered, then returns a _mutable_
   `Box<SelectorList>` that will get updated as extensions are applied.

   [the evaluator]: ../visitor/async_evaluate.dart
   [`ExtensionStore`]: extension_store.dart

2. When the evaluator encounters an `@extend`, it registers that in the current
   module's `ExtensionStore` as well. This updates any selectors that have
   already been registered with that extension, _and_ updates the extension's
   own extender (the selector that gets injected when the extension is applied,
   which is stored along with the extension). Note that the extender has to be
   extended separately from the selector in the style rule, because the latter
   gets redundant selectors trimmed eagerly and the former does not.

3. When the entrypoint stylesheet has been fully executed, the evaluator
   determines which extensions are visible from which modules and adds
   extensions from one store to one another accordingly using
   `ExtensionStore.addExtensions()`.

Otherwise, the process of [extending a selector] as described in the Sass spec
matches the logic here fairly closely. See `ExtensionStore._extendList()` for
the primary entrypoint for that logic.

[extending a selector]: https://github.com/sass/sass/blob/main/spec/at-rules/extend.md#extending-a-selector
tools\source\lib\src\functions.dart
 
tools\source\lib\src\functions\color.dart
 
tools\source\lib\src\functions\list.dart
 
tools\source\lib\src\functions\map.dart
 
tools\source\lib\src\functions\math.dart
 
tools\source\lib\src\functions\meta.dart
 
tools\source\lib\src\functions\README.md
# Built-In Functions

This directory contains the standard functions that are built into Sass itself,
both those that are available globally and those that are available only through
built-in modules. Each of the files here exports a corresponding
[`BuiltInModule`], and most define a list of global functions as well.

[`BuiltInModule`]: ../module/built_in.dart

There are a few functions that Sass supports that aren't defined here:

* The `if()` function is defined directly in the [`functions.dart`] file,
  although in most cases this is actually parsed as an [`IfExpression`] and
  handled directly by [the evaluator] since it has special behavior about when
  its arguments are evaluated. The function itself only exists for edge cases
  like `if(...$args)` or `meta.get-function("if")`.

  [`functions.dart`]: ../functions.dart
  [`IfExpression`]: ../ast/sass/expression/if.dart
  [the evaluator]: ../visitor/async_evaluate.dart

* Certain functions in the `sass:meta` module require runtime information that's
  only available to the evaluator. These functions are defined in the evaluator
  itself so that they have access to its private variables.
tools\source\lib\src\functions\selector.dart
 
tools\source\lib\src\functions\string.dart
 
tools\source\lib\src\importer.dart
 
tools\source\lib\src\importer\async.dart
 
tools\source\lib\src\importer\canonicalize_context.dart
 
tools\source\lib\src\importer\filesystem.dart
 
tools\source\lib\src\importer\js_to_dart\async.dart
 
tools\source\lib\src\importer\js_to_dart\async_file.dart
 
tools\source\lib\src\importer\js_to_dart\file.dart
 
tools\source\lib\src\importer\js_to_dart\sync.dart
 
tools\source\lib\src\importer\js_to_dart\utils.dart
 
tools\source\lib\src\importer\legacy_node.dart
 
tools\source\lib\src\importer\legacy_node\implementation.dart
 
tools\source\lib\src\importer\legacy_node\interface.dart
 
tools\source\lib\src\importer\node_package.dart
 
tools\source\lib\src\importer\no_op.dart
 
tools\source\lib\src\importer\package.dart
 
tools\source\lib\src\importer\result.dart
 
tools\source\lib\src\importer\utils.dart
 
tools\source\lib\src\import_cache.dart
 
tools\source\lib\src\interpolation_buffer.dart
 
tools\source\lib\src\interpolation_map.dart
 
tools\source\lib\src\io.dart
 
tools\source\lib\src\io\interface.dart
 
tools\source\lib\src\io\js.dart
 
tools\source\lib\src\io\README.md
# Input/Output Shim

This directory contains an API shim for doing various forms of IO across
different platforms. Dart chooses at compile time which of the three files to
use:

* `interface.dart` is used by the Dart Analyzer for static checking. It defines
  the "expected" interface of the other two files, although there aren't strong
  checks that their interfaces are exactly the same.

* `vm.dart` is used by the Dart VM, and defines IO operations in terms of the
  `dart:io` library.

* `js.dart` is used by JS platforms. On Node.js, it will use Node's `fs` and
  `process` APIs for IO operations. On other JS platforms, most IO operations
  won't work at all, although messages will still be emitted with
  `console.log()` and `console.error()`.
tools\source\lib\src\io\vm.dart
 
tools\source\lib\src\js.dart
 
tools\source\lib\src\js\array.dart
 
tools\source\lib\src\js\chokidar.dart
 
tools\source\lib\src\js\compile.dart
 
tools\source\lib\src\js\compiler.dart
 
tools\source\lib\src\js\compile_options.dart
 
tools\source\lib\src\js\compile_result.dart
 
tools\source\lib\src\js\deprecations.dart
 
tools\source\lib\src\js\exception.dart
 
tools\source\lib\src\js\exports.dart
 
tools\source\lib\src\js\function.dart
 
tools\source\lib\src\js\immutable.dart
 
tools\source\lib\src\js\importer.dart
 
tools\source\lib\src\js\importer\canonicalize_context.dart
 
tools\source\lib\src\js\legacy.dart
 
tools\source\lib\src\js\legacy\fiber.dart
 
tools\source\lib\src\js\legacy\importer_result.dart
 
tools\source\lib\src\js\legacy\render_context.dart
 
tools\source\lib\src\js\legacy\render_options.dart
 
tools\source\lib\src\js\legacy\render_result.dart
 
tools\source\lib\src\js\legacy\types.dart
 
tools\source\lib\src\js\legacy\value.dart
 
tools\source\lib\src\js\legacy\value\boolean.dart
 
tools\source\lib\src\js\legacy\value\color.dart
 
tools\source\lib\src\js\legacy\value\list.dart
 
tools\source\lib\src\js\legacy\value\map.dart
 
tools\source\lib\src\js\legacy\value\null.dart
 
tools\source\lib\src\js\legacy\value\number.dart
 
tools\source\lib\src\js\legacy\value\string.dart
 
tools\source\lib\src\js\logger.dart
 
tools\source\lib\src\js\module.dart
 
tools\source\lib\src\js\parser.dart
 
tools\source\lib\src\js\README.md
# JavaScript API

This directory contains Dart Sass's implementation of the Sass JS API. Dart's JS
interop support is primarily intended for _consuming_ JS libraries from Dart, so
we have to jump through some hoops in order to effectively _produce_ a JS
library with the desired API.

JS support has its own dedicated entrypoint in [`../js.dart`]. The [`cli_pkg`
package] ensures that when users load Dart Sass _as a library_, this entrypoint
is run instead of the CLI entrypoint, but otherwise it's up to us to set up the
library appropriately. To do so, we use JS interop to define an [`Exports`]
class that is in practice implemented by a CommonJS-like[^1] `exports` object,
and then assign various values to this object.

[`../js.dart`]: ../js.dart
[`cli_pkg` package]: https://github.com/google/dart_cli_pkg
[`Exports`]: exports.dart

[^1]: It's not _literally_ CommonJS because it needs to run directly on browsers
      as well, but it's still an object named `exports` that we can hang names
      off of.

## Value Types

The JS API value types pose a particular challenge from Dart. Although every
Dart class is represented by a JavaScript class when compiled to JS, Dart has no
way of specifying what the JS API of those classes should be. What's more, in
order to make the JS API as efficient as possible, we want to be able to pass
the existing Dart [`Value`] objects as-is to custom functions rather than
wrapping them with JS-only wrappers.

[`Value`]: ../value.dart

To solve the first problem, in [`reflection.dart`] we use JS interop to wrap the
manual method of defining a JavaScript class. We use this to create a
JS-specific class for each value type, with all the JS-specific methods and
properties defined by Sass's JS API spec. However, while normal JS constructors
just set some properties on `this`, our constructors for these classes return
Dart `Value` objects instead.

[`reflection.dart`]: reflection.dart

"But wait," I hear you say, "those `Value` objects aren't instances of the new
JS class you've created!" This is where the deep magic comes in. Once we've
defined our class with its phony constructor, we create a single Dart object of
the given `Value` subclass and _edit its JavaScript prototype chain_ to include
the new class we just created. Once that's done, all the Dart value types will
have exactly the right JS API (including responding correctly to `instanceof`!)
and the constructor will now correctly return an instance of the JS class.

## Legacy API

Dart Sass also supports the legacy JS API in the [`legacy`] directory. This hews
as close as possible to the API of the old `node-sass` package which wrapped the
old LibSass implementation. It's no longer being actively updated, but we still
need to support it at least until the next major version release of Dart Sass.

[`legacy`]: legacy
tools\source\lib\src\js\reflection.dart
 
tools\source\lib\src\js\source_span.dart
 
tools\source\lib\src\js\url.dart
 
tools\source\lib\src\js\utils.dart
 
tools\source\lib\src\js\value.dart
 
tools\source\lib\src\js\value\argument_list.dart
 
tools\source\lib\src\js\value\boolean.dart
 
tools\source\lib\src\js\value\calculation.dart
 
tools\source\lib\src\js\value\color.dart
 
tools\source\lib\src\js\value\function.dart
 
tools\source\lib\src\js\value\list.dart
 
tools\source\lib\src\js\value\map.dart
 
tools\source\lib\src\js\value\mixin.dart
 
tools\source\lib\src\js\value\number.dart
 
tools\source\lib\src\js\value\string.dart
 
tools\source\lib\src\js\visitor\expression.dart
 
tools\source\lib\src\js\visitor\statement.dart
 
tools\source\lib\src\logger.dart
 
tools\source\lib\src\logger\deprecation_processing.dart
 
tools\source\lib\src\logger\js_to_dart.dart
 
tools\source\lib\src\logger\stderr.dart
 
tools\source\lib\src\logger\tracking.dart
 
tools\source\lib\src\module.dart
 
tools\source\lib\src\module\built_in.dart
 
tools\source\lib\src\module\forwarded_view.dart
 
tools\source\lib\src\module\shadowed_view.dart
 
tools\source\lib\src\parse\at_root_query.dart
 
tools\source\lib\src\parse\css.dart
 
tools\source\lib\src\parse\keyframe_selector.dart
 
tools\source\lib\src\parse\media_query.dart
 
tools\source\lib\src\parse\parser.dart
 
tools\source\lib\src\parse\README.md
# Sass Parser

This directory contains various parsers used by Sass. The two most relevant
classes are:

* [`Parser`]: The base class of all other parsers, which includes basic
  infrastructure, utilities, and methods for parsing common CSS constructs that
  appear across multiple different specific parsers.

  [`Parser`]: parser.dart

* [`StylesheetParser`]: The base class specifically for the initial stylesheet
  parse. Almost all of the logic for parsing Sass files, both statement- and
  expression-level, lives here. Only places where individual syntaxes differ
  from one another are left abstract or overridden by subclasses.

  [`StylesheetParser`]: stylesheet.dart

All Sass parsing is done by hand using the [`string_scanner`] package, which we
use to read the source [code-unit]-by-code-unit while also tracking source span
information which we can then use to report errors and generate source maps. We
don't use any kind of parser generator, partly because Sass's grammar requires
arbitrary backtracking in various places and partly because handwritten code is
often easier to read and debug.

[`string_scanner`]: https://pub.dev/packages/string_scanner
[code-unit]: https://developer.mozilla.org/en-US/docs/Glossary/Code_unit

The parser is simple recursive descent. There's usually a method for each
logical production that either consumes text and returns its corresponding AST
node or throws an exception; in some cases, a method (conventionally beginning
with `try`) will instead consume text and return a node if it matches and return
null without consuming anything if it doesn't.
tools\source\lib\src\parse\sass.dart
 
tools\source\lib\src\parse\scss.dart
 
tools\source\lib\src\parse\selector.dart
 
tools\source\lib\src\parse\stylesheet.dart
 
tools\source\lib\src\README.md
# The Sass Compiler

* [Life of a Compilation](#life-of-a-compilation)
  * [Late Parsing](#late-parsing)
  * [Early Serialization](#early-serialization)
* [JS Support](#js-support)
* [APIs](#apis)
  * [Importers](#importers)
  * [Custom Functions](#custom-functions)
  * [Loggers](#loggers)
* [Built-In Functions](#built-in-functions)
* [`@extend`](#extend)

This is the root directory of Dart Sass's private implementation libraries. This
contains essentially all the business logic defining how Sass is actually
compiled, as well as the APIs that users use to interact with Sass. There are
two exceptions:

* [`../../bin/sass.dart`] is the entrypoint for the Dart Sass CLI (on all
  platforms). While most of the logic it runs exists in this directory, it does
  contain some logic to drive the basic compilation logic and handle errors. All
  the most complex parts of the CLI, such as option parsing and the `--watch`
  command, are handled in the [`executable`] directory. Even Embedded Sass runs
  through this entrypoint, although it gets immediately gets handed off to [the
  embedded compiler].

  [`../../bin/sass.dart`]: ../../bin/sass.dart
  [`executable`]: executable
  [the embedded compiler]: embedded/README.md

* [`../sass.dart`] is the entrypoint for the public Dart API. This is what's
  loaded when a Dart package imports Sass. It just contains the basic
  compilation functions, and exports the rest of the public APIs from this
  directory.

  [`../sass.dart`]: ../sass.dart

Everything else is contained here, and each file and some subdirectories have
their own documentation. But before you dive into those, let's take a look at
the general lifecycle of a Sass compilation.

## Life of a Compilation

Whether it's invoked through the Dart API, the JS API, the CLI, or the embedded
host, the basic process of a Sass compilation is the same. Sass is implemented
as an AST-walking [interpreter] that operates in roughly three passes:

[interpreter]: https://en.wikipedia.org/wiki/Interpreter_(computing)

1. **Parsing**. The first step of a Sass compilation is always to parse the
   source file, whether it's SCSS, the indented syntax, or CSS. The parsing
   logic lives in the [`parse`] directory, while the abstract syntax tree that
   represents the parsed file lives in [`ast/sass`].

   [`parse`]: parse/README.md
   [`ast/sass`]: ast/sass/README.md

2. **Evaluation**. Once a Sass file is parsed, it's evaluated by
   [`visitor/async_evaluate.dart`]. (Why is there both an async and a sync
   version of this file? See [Synchronizing] for details!) The evaluator handles
   all the Sass-specific logic: it resolves variables, includes mixins, executes
   control flow, and so on. As it goes, it builds up a new AST that represents
   the plain CSS that is the compilation result, which is defined in
   [`ast/css`].

   [`visitor/async_evaluate.dart`]: visitor/async_evaluate.dart
   [Synchronizing]: ../../CONTRIBUTING.md#synchronizing
   [`ast/css`]: ast/css/README.md

   Sass evaluation is almost entirely linear: it begins at the first statement
   of the file, evaluates it (which may involve evaluating its nested children),
   adds its result to the CSS AST, and then moves on to the second statement. On
   it goes until it reaches the end of the file, at which point it's done. The
   only exception is module resolution: every Sass module has its own compiled
   CSS AST, and once the entrypoint file is done compiling the evaluator will go
   back through these modules, resolve `@extend`s across them as necessary, and
   stitch them together into the final stylesheet.

   SassScript, the expression-level syntax, is handled by the same evaluator.
   The main difference between SassScript and statement-level evaluation is that
   the same SassScript values are used during evaluation _and_ as part of the
   CSS AST. This means that it's possible to end up with a Sass-specific value,
   such as a map or a first-class function, as the value of a CSS declaration.
   If that happens, the Serialization phase will signal an error when it
   encounters the invalid value.

3. **Serialization**. Once we have the CSS AST that represents the compiled
   stylesheet, we need to convert it into actual CSS text. This is done by
   [`visitor/serialize.dart`], which walks the AST and builds up a big buffer of
   the resulting CSS. It uses [a special string buffer] that tracks source and
   destination locations in order to generate [source maps] as well.

   [`visitor/serialize.dart`]: visitor/serialize.dart
   [a special string buffer]: util/source_map_buffer.dart
   [source maps]: https://web.dev/source-maps/

There's actually one slight complication here: the first and second pass aren't
as separate as they appear. When one Sass stylesheet loads another with `@use`,
`@forward`, or `@import`, that rule is handled by the evaluator and _only at
that point_ is the loaded file parsed. So in practice, compilation actually
switches between parsing and evaluation, although each individual stylesheet
naturally has to be parsed before it can be evaluated.

### Late Parsing

Some syntax within a stylesheet is only parsed _during_ evaluation. This allows
authors to use `#{}` interpolation to inject Sass variables and other dynamic
values into various locations, such as selectors, while still allowing Sass to
parse them to support features like nesting and `@extend`. The following
syntaxes are parsed during evaluation:

* [Selectors](parse/selector.dart)
* [`@keyframes` frames](parse/keyframe_selector.dart)
* [Media queries](parse/media_query.dart) (for historical reasons, these are
  parsed before evaluation and then _reparsed_ after they've been fully
  evaluated)

### Early Serialization

There are also some cases where the evaluator can serialize values before the
main serialization pass. For example, if you inject a variable into a selector
using `#{}`, that variable's value has to be converted to a string during
evaluation so that the evaluator can then parse and handle the newly-generated
selector. The evaluator does this by invoking the serializer _just_ for that
specific value. As a rule of thumb, this happens anywhere interpolation is used
in the original stylesheet, although there are a few other circumstances as
well.

## JS Support

One of the main benefits of Dart as an implementation language is that it allows
us to distribute Dart Sass both as an extremely efficient stand-alone executable
_and_ an easy-to-install pure-JavaScript package, using the dart2js compilation
tool. However, properly supporting JS isn't seamless. There are two major places
where we need to think about JS support:

1. When interfacing with the filesystem. None of Dart's IO APIs are natively
   supported on JS, so for anything that needs to work on both the Dart VM _and_
   Node.js we define a shim in the [`io`] directory that will be implemented in
   terms of `dart:io` if we're running on the Dart VM or the `fs` or `process`
   modules if we're running on Node. (We don't support IO at all on the browser
   except to print messages to the console.)

   [`io`]: io/README.md

2. When exposing an API. Dart's JS interop is geared towards _consuming_ JS
   libraries from Dart, not producing a JS library written in Dart, so we have
   to jump through some hoops to make it work. This is all handled in the [`js`]
   directory.

   [`js`]: js/README.md

## APIs

One of Sass's core features is its APIs, which not only compile stylesheets but
also allow users to provide plugins that can be invoked from within Sass. In
both the JS API, the Dart API, and the embedded compiler, Sass provides three
types of plugins: importers, custom functions, and loggers.

### Importers

Importers control how Sass loads stylesheets through `@use`, `@forward`, and
`@import`. Internally, _all_ stylesheet loads are modeled as importers. When a
user passes a load path to an API or compiles a stylesheet through the CLI, we
just use the built-in [`FilesystemImporter`] which implements the same interface
that we make available to users.

[`FilesystemImporter`]: importer/filesystem.dart

In the Dart API, the importer root class is [`importer/async_importer.dart`].
The JS API and the embedded compiler wrap the Dart importer API in
[`importer/node_to_dart`] and [`embedded/importer`] respectively.

[`importer/async_importer.dart`]: importer/async_importer.dart
[`importer/node_to_dart`]: importer/node_to_dart
[`embedded/importer`]: embedded/importer

### Custom Functions

Custom functions are defined by users of the Sass API but invoked by Sass
stylesheets. To a Sass stylesheet, they look like any other built-in function:
users pass SassScript values to them and get SassScript values back. In fact,
all the core Sass functions are implemented using the Dart custom function API.

Because custom functions take and return SassScript values, that means we need
to make _all_ values available to the various APIs. For Dart, this is
straightforward: we need to have objects to represent those values anyway, so we
just expose those objects publicly (with a few `@internal` annotations here and
there to hide APIs we don't want users relying on). These value types live in
the [`value`] directory.

[`value`]: value/README.md

Exposing values is a bit more complex for other platforms. For the JS API, we do
a bit of metaprogramming in [`js/value`] so that we can return the
same Dart values we use internally while still having them expose a JS API that
feels native to that language. For the embedded host, we convert them to and
from a protocol buffer representation in [`embedded/protofier.dart`].

[`js/value`]: js/value/README.md
[`embedded/value.dart`]: embedded/value.dart

### Loggers

Loggers are the simplest of the plugins. They're just callbacks that are invoked
any time Dart Sass would emit a warning (from the language or from `@warn`) or a
debug message from `@debug`. They're defined in:

* [`logger.dart`](logger.dart) for Dart
* [`js/logger.dart`](js/logger.dart) for Node
* [`embedded/logger.dart`](embedded/logger.dart) for the embedded compiler

## Built-In Functions

All of Sass's built-in functions are defined in the [`functions`] directory,
including both global functions and functions defined in core modules like
`sass:math`. As mentioned before, these are defined using the standard custom
function API, although in a few cases they use additional private features like
the ability to define multiple overloads of the same function name.

[`functions`]: functions/README.md

## `@extend`

The logic for Sass's `@extend` rule is particularly complex, since it requires
Sass to not only parse selectors but to understand how to combine them and when
they can be safely optimized away. Most of the logic for this is contained
within the [`extend`] directory.

[`extend`]: extend/README.md
tools\source\lib\src\stylesheet_graph.dart
 
tools\source\lib\src\syntax.dart
 
tools\source\lib\src\util\box.dart
 
tools\source\lib\src\util\character.dart
 
tools\source\lib\src\util\fuzzy_equality.dart
 
tools\source\lib\src\util\iterable.dart
 
tools\source\lib\src\util\lazy_file_span.dart
 
tools\source\lib\src\util\limited_map_view.dart
 
tools\source\lib\src\util\map.dart
 
tools\source\lib\src\util\merged_map_view.dart
 
tools\source\lib\src\util\multi_dir_watcher.dart
 
tools\source\lib\src\util\multi_span.dart
 
tools\source\lib\src\util\no_source_map_buffer.dart
 
tools\source\lib\src\util\nullable.dart
 
tools\source\lib\src\util\number.dart
 
tools\source\lib\src\util\option.dart
 
tools\source\lib\src\util\prefixed_map_view.dart
 
tools\source\lib\src\util\public_member_map_view.dart
 
tools\source\lib\src\util\source_map_buffer.dart
 
tools\source\lib\src\util\span.dart
 
tools\source\lib\src\util\unprefixed_map_view.dart
 
tools\source\lib\src\utils.dart
 
tools\source\lib\src\value.dart
 
tools\source\lib\src\value\argument_list.dart
 
tools\source\lib\src\value\boolean.dart
 
tools\source\lib\src\value\calculation.dart
 
tools\source\lib\src\value\color.dart
 
tools\source\lib\src\value\color\channel.dart
 
tools\source\lib\src\value\color\conversions.dart
 
tools\source\lib\src\value\color\gamut_map_method.dart
 
tools\source\lib\src\value\color\gamut_map_method\clip.dart
 
tools\source\lib\src\value\color\gamut_map_method\local_minde.dart
 
tools\source\lib\src\value\color\interpolation_method.dart
 
tools\source\lib\src\value\color\space.dart
 
tools\source\lib\src\value\color\space\a98_rgb.dart
 
tools\source\lib\src\value\color\space\display_p3.dart
 
tools\source\lib\src\value\color\space\hsl.dart
 
tools\source\lib\src\value\color\space\hwb.dart
 
tools\source\lib\src\value\color\space\lab.dart
 
tools\source\lib\src\value\color\space\lch.dart
 
tools\source\lib\src\value\color\space\lms.dart
 
tools\source\lib\src\value\color\space\oklab.dart
 
tools\source\lib\src\value\color\space\oklch.dart
 
tools\source\lib\src\value\color\space\prophoto_rgb.dart
 
tools\source\lib\src\value\color\space\rec2020.dart
 
tools\source\lib\src\value\color\space\rgb.dart
 
tools\source\lib\src\value\color\space\srgb.dart
 
tools\source\lib\src\value\color\space\srgb_linear.dart
 
tools\source\lib\src\value\color\space\utils.dart
 
tools\source\lib\src\value\color\space\xyz_d50.dart
 
tools\source\lib\src\value\color\space\xyz_d65.dart
 
tools\source\lib\src\value\function.dart
 
tools\source\lib\src\value\list.dart
 
tools\source\lib\src\value\map.dart
 
tools\source\lib\src\value\mixin.dart
 
tools\source\lib\src\value\null.dart
 
tools\source\lib\src\value\number.dart
 
tools\source\lib\src\value\number\complex.dart
 
tools\source\lib\src\value\number\single_unit.dart
 
tools\source\lib\src\value\number\unitless.dart
 
tools\source\lib\src\value\README.md
# Value Types

This directory contains definitions for all the SassScript value types. These
definitions are used both to represent SassScript values internally and in the
public Dart API. They are usually produced by [the evaluator] as it evaluates
the expression-level [Sass AST].

[the evaluator]: ../visitor/async_evaluate.dart
[Sass AST]: ../ast/sass/README.md

Sass values are always immutable, even internally. Any changes to them must be
done by creating a new value. In some cases, it's easiest to make a mutable
copy, edit it, and then create a new immutable value from the result.
tools\source\lib\src\value\string.dart
 
tools\source\lib\src\visitor\any_selector.dart
 
tools\source\lib\src\visitor\ast_search.dart
 
tools\source\lib\src\visitor\async_evaluate.dart
 
tools\source\lib\src\visitor\clone_css.dart
 
tools\source\lib\src\visitor\evaluate.dart
 
tools\source\lib\src\visitor\every_css.dart
 
tools\source\lib\src\visitor\expression_to_calc.dart
 
tools\source\lib\src\visitor\find_dependencies.dart
 
tools\source\lib\src\visitor\interface\css.dart
 
tools\source\lib\src\visitor\interface\expression.dart
 
tools\source\lib\src\visitor\interface\modifiable_css.dart
 
tools\source\lib\src\visitor\interface\selector.dart
 
tools\source\lib\src\visitor\interface\statement.dart
 
tools\source\lib\src\visitor\interface\value.dart
 
tools\source\lib\src\visitor\README.md
# Visitors

This directory contains various types that implement the [visitor pattern] for
[various ASTs]. A few of these, such as [the evaluator] and [the serializer],
implement critical business logic for the Sass compiler. Most of the rest are
either small utilities or base classes for small utilities that need to run over
an AST to determine some kind of information about it. Some are even entirely
unused within Sass itself, and exist only to support users of the [`sass_api`]
package.

[visitor pattern]: https://en.wikipedia.org/wiki/Visitor_pattern
[various ASTs]: ../ast
[the evaluator]: async_evaluate.dart
[the serializer]: serialize.dart
[`sass_api`]: https://pub.dev/packages/sass_api
tools\source\lib\src\visitor\recursive_ast.dart
 
tools\source\lib\src\visitor\recursive_selector.dart
 
tools\source\lib\src\visitor\recursive_statement.dart
 
tools\source\lib\src\visitor\replace_expression.dart
 
tools\source\lib\src\visitor\selector_search.dart
 
tools\source\lib\src\visitor\serialize.dart
 
tools\source\lib\src\visitor\statement_search.dart
 
tools\source\pubspec.lock
 
tools\source\pubspec.yaml
 

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