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Dart 1 only

Dart->JS Size and Performance Tool

jsbench #

A minimal Dart -> JavaScript size and performance tool.

This library assumes you are either using pub build or a similar tool to generate .dart.js files from .dart files, but otherwise makes no other assumptions. It is recommended to use --dump-info to output additional information about the compilation.

Example #

The following is an example of running jsbench on this repository:

$ pub build
$ pub run jsbench
main.dart.js 35.9 kB
compiler overhead 16.6 kB 46.1%
minified? Yes
noSuchMethod? No
dart:_js_helper 10.9 kB 30.3%
dart:html 3.39 kB 09.4%
dart:core 2.47 kB 06.9%
dart:_interceptors 2.06 kB 05.7%

Usage #

This tool should either be used via pub global activate or as part of your dev_dependencies.

Then, build your application, and run jsbench. For example:

$ pub build
$ pub run jsbench

To get more interesting information (not just disk size), add --dump-info:

transformers:
  - $dart2js:
      commandLineOptions:
          - --dump-info

See this packages' pubspec.yaml for an example.

If you want more information check out dump-info-visualizer.

Flags #

--no-dump: Ignores all .info.json files on disk.

--no-collapse-package: Do not collapse all package:<name> libraries.

--dump-trivial-size: Threshold number of bytes to print out a library name.

--input: Glob pattern(s) to find emitted JavaScript files.

--exclude Glob pattern(s) to exclude when finding inputs.

--archive: Archive formats to recursively read from when finding inputs. Only tar is currently supported.

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Dart->JS Size and Performance Tool

Repository (GitHub)
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License

BSD-3-Clause (LICENSE)

Dependencies

archive, args, glob, kilobyte, path

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