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Description:

build web compilers

Web compilers for users of package:build.

Installation
Usage
Configuration
Manual Usage

Installation #
This package is intended to be used as a development dependency for users
of package:build who want to run code in a browser. Simply add the
following to your pubspec.yaml:
dev_dependencies:
build_web_compilers:
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Usage #
If you are using the autogenerated build script (going through
dart run build_runner <command> instead of handwriting a build.dart file),
then all you need is the dev_dependency listed above.
Configuration #
Configuring the default compiler #
By default, the Dart development compiler (dartdevc, also known as
DDC) will be used.
If you would like to opt into dart2js you will need to add a build.yaml
file, which should look roughly like the following:
targets:
$default:
builders:
build_web_compilers:entrypoint:
# These are globs for the entrypoints you want to compile.
generate_for:
- test/**.browser_test.dart
- web/**.dart
options:
compiler: dart2js
# List any dart2js specific args here, or omit it.
dart2js_args:
- -O2
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Configuring -D environment variables #
dartdevc is a modular compiler, so in order to ensure consistent builds
in every module environment variables must be configured globally. Configure
with a mapping in YAML. Environment defined variables can be read with
const String.fromEnvironment and const bool.fromEnvironment. For example:
global_options:
build_web_compilers:ddc:
options:
environment:
SOME_VAR: some value
ANOTHER_VAR: false
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For dart2js, use the dart2js_args option. This may be configured globally, or
per target.
targets:
$default:
builders:
build_web_compilers:entrypoint:
options:
dart2js_args:
- -DSOME_VAR=some value
- -DANOTHER_VAR=true
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These may also be specified on the command line with a --define argument.
webdev serve -- '--define=build_web_compilers:ddc=environment={"SOME_VAR":"changed"}'
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Manual Usage #
If you are using a custom build script, you will need to add the following
builder applications to what you already have, almost certainly at the end of
the list (unless you need to post-process the js files).
[
apply(
'build_web_compilers:ddc',
[
(_) => new ModuleBuilder(),
(_) => new UnlinkedSummaryBuilder(),
(_) => new LinkedSummaryBuilder(),
(_) => new DevCompilerBuilder()
],
toAllPackages(),
// Recommended, but not required. This makes it so only modules that are
// imported by entrypoints get compiled.
isOptional: true,
hideOutput: true),
apply('build_web_compilers:entrypoint',
// You can also use `WebCompiler.Dart2Js`. If you don't care about
// dartdevc at all you may also omit the previous builder application
// entirely.
[(_) => new WebEntrypointBuilder(WebCompiler.DartDevc)], toRoot(),
hideOutput: true,
// These globs should match your entrypoints only.
defaultGenerateFor: const InputSet(
include: const ['web/**', 'test/**.browser_test.dart'])),
]
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