How do I enable source map generation when using "webdev build"?

Question

When using Dart 2 and the webdev build command, I get a build/main.dart.js file. At the end of this file, there is a comment pointing the source map:

//# sourceMappingURL=main.dart.js.map

However, this file doesn't exist. How do I get the .map file and Dart source files to show up in the build directory so that Chrome devtools will see them?

Answer 1

According to the document of webdev build, you should use webdev build --no-release instead. (but this will use DDC compiler instead.)

Update info: By default, webdev build in release mode will remove all *.js.map file, so you can put a build.yaml file in your project root folder to deactivate dart cleanup source.

For example, (build.yaml file) targets: $default: builders: build_web_compilers|dart_source_cleanup: release_options: enabled: false