15e16148f4
Create transformers that allow specifying transformer actions on specific libraries. * angular2/transform/codegen: Generates all necessary code. * angular2/transform/reflection_rewriter: Replaces `bootstrap` calls in application entry points to remove transitive dart:mirrors import, resulting in smaller code size & faster execution. * angular2/transform/deferred_rewriter: Rewrites deferred imports and `loadLibrary` calls to initialize Angular2 and preserve deferred operation. Proper configuration of these three transformers can replace the single angular2 transformer, resulting in significant performance gains for builds of large angular2 apps. Update angular2 itself to declare the codegen transformer, since it has neither deferred imports nor application entry points. Remove the undocumented & unused quick_transformer.
46 lines
1.6 KiB
Dart
46 lines
1.6 KiB
Dart
library angular2.transform.deferred_rewriter.dart;
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import 'dart:async';
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import 'package:barback/barback.dart';
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import 'package:angular2/src/transform/deferred_rewriter/transformer.dart'
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as base show DeferredRewriter;
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// TODO(kegluneq): Make this a TransformerGroup and add an AggregateTransformer
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// that counts the number of transformed files & primary inputs.
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// If the number of primary inputs is >> transformed files, output an error
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// telling the user to use $include or $exclude in their pubspec.
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/// Rewrites `deferred` imports that need Angular 2 initialization.
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///
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/// This transformer can be used along with others as a faster alternative to
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/// the single angular2 transformer.
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///
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/// See [the wiki][] for details.
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///
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/// [the wiki]: https://github.com/angular/angular/wiki/Angular-2-Dart-Transformer
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class DeferredRewriter extends Transformer implements DeclaringTransformer {
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final base.DeferredRewriter _impl;
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/// Ctor which tells pub that this can be run as a standalone transformer.
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DeferredRewriter.asPlugin(BarbackSettings _)
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: _impl = new base.DeferredRewriter();
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/// Signal that we process all .dart files.
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///
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/// Instead, use the standard, built-in $exclude and $include transformer
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/// parameters to control which files this transformer runs on.
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/// See [https://www.dartlang.org/tools/pub/assets-and-transformers.html] for
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/// details.
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@override
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String get allowedExtensions => '.dart';
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@override
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declareOutputs(transform) => _impl.declareOutputs(transform);
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@override
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Future apply(transform) =>
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_impl.applyImpl(transform, transform.primaryInput.id);
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}
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