medz/qq-emoicon

This package is abandoned and no longer maintained. No replacement package was suggested.

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Package info

github.com/medz/dart2esm

Language:Dart

Type:metapackage

pkg:composer/medz/qq-emoicon

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dev-master 2016-08-23 11:54 UTC

Requires

MIT 2412a678a87773c9438d1a48257f81c6e848e0eb

  • Seven <lovevipdsw.woop@outlook.com>

This package is auto-updated.

Last update: 2026-06-30 09:28:00 UTC

README

dart2esm is a Dart-to-native-ESM compiler.

The compiler uses Dart's Common Front End and Kernel IR as the frontend, then emits clean ECMAScript modules. JavaScript and Node primitives are used directly where they are semantically equivalent, with small Dart semantic helpers emitted only when required.

The 0.1.0 goal is complete Dart syntax and Dart SDK lowering to native ESM, except for dart:io. ESM version targeting is intentionally not split into compatibility profiles yet.

Usage

dart2esm bin/main.dart -o dist/main.mjs

By default the generated module invokes main() at top level. Use --no-run-main when the output should be imported as a module without executing the Dart entrypoint:

dart2esm lib/example.dart -o dist/example.mjs --no-run-main

Pass compile-time environment declarations with -Dkey=value or --define=key=value; multiple values can be repeated or comma-separated.

Use --metrics to print raw/gzip size, line count, and emitted helper count for the generated ESM module. Add --compare-dart2js to also compile the same Dart source with dart compile js -O2 and print dart2esm/dart2js size ratios:

dart2esm lib/example.dart -o dist/example.mjs --metrics --compare-dart2js

You can also compile an existing Kernel component:

dart2esm build/input.dill -o dist/input.mjs

Architecture

  1. Dart source is lowered to Kernel with dart compile kernel --no-link-platform, falling back to the SDK frontend_server with the DDC platform for JS/web-only SDK libraries.
  2. Kernel bytes are read with package:kernel.
  3. The backend walks the entry component and emits native .mjs.
  4. Public entry-library declarations are exported as ESM bindings. Imported local Dart libraries are bundled into the same output module and only re-exported when the Dart entry library exports them.

Unsupported Libraries

dart:io APIs are not supported in 0.1.0.