Use const bool.fromEnvironment("dart.tool.dart2wasm") to detect dart2wasm #149996
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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact "@test-exemption-reviewer" in the #hackers channel in Chat (don't just cc them here, they won't see it! Use Discord!). If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. |
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Golden file changes have been found for this pull request. Click here to view and triage (e.g. because this is an intentional change). If you are still iterating on this change and are not ready to resolve the images on the Flutter Gold dashboard, consider marking this PR as a draft pull request above. You will still be able to view image results on the dashboard, commenting will be silenced, and the check will not try to resolve itself until marked ready for review. For more guidance, visit Writing a golden file test for Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. |
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test-exempt: code refactor with no semantic change |
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Thanks @stuartmorgan & @osa1 ! |
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The |
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I'm not very familiar with flutter-gold, the framework channel on Discord is probably the best place to ask. |
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…wasm (flutter#149996) Dart2Wasm doesn't officially support `dart:ffi` (only a small sketchy subset needed in flutter web engine). We have seen user reporting issues where existing packages don't work with dart2wasm due to using `dart.library.ffi` in `bool.fromEnvironment` or in conditional imports and it doing the wrong thing. So we're going to make `dart.library.ffi` `false` in the compiler. We therefore update the code to detect whether it runs under wasm via a new `dart.tool.dart2wasm` environment variable. This is a preparation for the change in dart2wasm which will start making `const bool.fromEnvironment('dart.library.ffi')` return `false` instead of `true`.
Dart2Wasm doesn't officially support
dart:ffi(only a small sketchy subset needed in flutter web engine). We have seen user reporting issues where existing packages don't work with dart2wasm due to usingdart.library.ffiinbool.fromEnvironmentor in conditional imports and it doing the wrong thing. So we're going to makedart.library.ffifalsein the compiler.We therefore update the code to detect whether it runs under wasm via a new
dart.tool.dart2wasmenvironment variable.This is a preparation for the change in dart2wasm which will start making
const bool.fromEnvironment('dart.library.ffi')returnfalseinstead oftrue.