| The frontend_server package is used by both the flutter command line tool and the frontend_server_client package (used by webdev and package:test). | 
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 | ## API Stability | 
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 | Changes to the command line API or behavior should be tested against the following test suites (in addition to normal HHH testing): | 
 |   * flutter_tools: https://github.com/flutter/flutter/tree/master/packages/flutter_tools | 
 |   * frontend_server_client: https://github.com/dart-lang/webdev/tree/master/frontend_server_client | 
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 | Otherwise these changes will need to be carefully coordinated with the flutter tooling and frontend_server_client teams. | 
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 | This API stability does not cover any of the source code APIs. | 
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 | ### Stable subset | 
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 | * The frontend_server kernel compilation and expression evaluation for kernel should be considered "stable". | 
 | * The frontend_server JavaScript compilation is semi-stable, but clients should anticipate coordinated breaking changes in the future. | 
 | * The frontend_server JavaScript expression evaluation is experimental and is expected to change significantly from Dec 2020 through the end of 2021. | 
 | * Specific flags may be added for experimentation and should not be considered stable. |