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Adding support for DDC modules when running Flutter Web in debug mode (#141423) 
### Context:

DDC modules are abstractions over how libraries are loaded/updated. The entirety of google3 uses the DDC/legacy module system due to its flexibility extensibility over the other two (ES6 and AMD/RequireJS). Unifying DDC's module system saves us from duplicating work and will allow us to have finer grained control over how JS modules are loaded. This is a a prerequisite to features such as hot reload.

### Overview:

This change plumbs a boolean flag through flutter_tools that switches between DDC (new) and AMD (current) modules. This mode is automatically applied when `--extra-front-end-options=--dartdevc-module-format=ddc` is specified alongside `flutter run`. Other important additions include:
* Splitting Flutter artifacts between DDC and AMD modules
* Adding unit tests for the DDC module system
* Additional bootstrapper logic for the DDC module system

We don't expect to see any user-visible behavior or performance differences.

This is dependent on [incoming module system support in DWDS](https://github.com/dart-lang/webdev/pull/2295) and [additional artifacts in the engine](https://github.com/flutter/engine/pull/47783).

This is part of a greater effort to deprecate the AMD module system: https://github.com/dart-lang/sdk/issues/52361
2024-02-24 00:26:04 +00:00
..
hermetic Adding support for DDC modules when running Flutter Web in debug mode (#141423) 2024-02-24 00:26:04 +00:00
permeable Add aab as alias for appbundle (#143855) 2024-02-21 18:19:41 +00:00
README.md

README.md

This directory contains tests for specific flutter commands.

Tests that are self-contained unit tests should go in hermetic/.

Tests that are more end-to-end, e.g. that involve actually running subprocesses, should go in permeable/.

The ../../tool/coverage_tool.dart script (which is used to collect coverage for the tool) runs only the tests in the hermetic directory when collecting coverage.