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* Flags to `dart compile wasm` Some options are not relevant to a standalone user of `dart compile wasm` (e.g. specyfing dart-sdk, platform file etc). => Those aren't offered by the `dart compile wasm` tool directly. => We use the `--extra-compiler-option=` instead which passes through arbitrary options to the dart2wasm compiler. => We don't maintain compatibility of those options, if we update them we'll ensure to also update flutter tools * Binaryen optimization passes This change will mean we use the binaryen flags from Dart SDK which are slightly different from the ones in flutter. * Optimization configuration This change will also start using the more standardized `-O` flag for determining optimization levels. The meaning of those flags have been mostly aligned with dart2js (with some differences remaining). * Minimization Using the new optimization flags, namely `-O4` for `--wasm-opt=full`, will automatically enable the new `--minify` support. Minification is Dart semantics preserving but changes the `<obj>.runtimeType.toString()` to use minified names (just as in dart2js). * Code size changes Overall this change will reduce wonderous code size by around 10%. Issue https://github.com/dart-lang/sdk/issues/54675 |
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