a0c4b2d8f0
Closure requires @nocollapse on Ivy definition static fields in order to not convert them to standalone constants. However tsickle, the tool which would ordinarily be responsible for adding @nocollapse, doesn't properly annotate fields which are added synthetically via transforms. So this commit adds @nocollapse by applying regular expressions against code during the final write to disk. PR Close #25775
59 lines
2.5 KiB
TypeScript
59 lines
2.5 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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// Closure compiler transforms the form `Service.ngInjectableDef = X` into
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// `Service$ngInjectableDef = X`. To prevent this transformation, such assignments need to be
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// annotated with @nocollapse. Unfortunately, a bug in Typescript where comments aren't propagated
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// through the TS transformations precludes adding the comment via the AST. This workaround detects
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// the static assignments to R3 properties such as ngInjectableDef using a regex, as output files
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// are written, and applies the annotation through regex replacement.
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//
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// TODO(alxhub): clean up once fix for TS transformers lands in upstream
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//
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// Typescript reference issue: https://github.com/Microsoft/TypeScript/issues/22497
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// Pattern matching all Render3 property names.
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const R3_DEF_NAME_PATTERN = [
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'ngBaseDef',
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'ngComponentDef',
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'ngDirectiveDef',
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'ngInjectableDef',
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'ngInjectorDef',
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'ngModuleDef',
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'ngPipeDef',
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].join('|');
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// Pattern matching `Identifier.property` where property is a Render3 property.
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const R3_DEF_ACCESS_PATTERN = `[^\\s\\.()[\\]]+\.(${R3_DEF_NAME_PATTERN})`;
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// Pattern matching a source line that contains a Render3 static property assignment.
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// It declares two matching groups - one for the preceding whitespace, the second for the rest
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// of the assignment expression.
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const R3_DEF_LINE_PATTERN = `^(\\s*)(${R3_DEF_ACCESS_PATTERN} = .*)$`;
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// Regex compilation of R3_DEF_LINE_PATTERN. Matching group 1 yields the whitespace preceding the
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// assignment, matching group 2 gives the rest of the assignment expressions.
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const R3_MATCH_DEFS = new RegExp(R3_DEF_LINE_PATTERN, 'gmu');
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const R3_TSICKLE_DECL_PATTERN =
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`(\\/\\*\\*[*\\s]*)(@[^*]+\\*\\/\\s+[^.]+\\.(?:${R3_DEF_NAME_PATTERN});)`;
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const R3_MATCH_TSICKLE_DECL = new RegExp(R3_TSICKLE_DECL_PATTERN, 'gmu');
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// Replacement string that complements R3_MATCH_DEFS. It inserts `/** @nocollapse */` before the
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// assignment but after any indentation. Note that this will mess up any sourcemaps on this line
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// (though there shouldn't be any, since Render3 properties are synthetic).
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const R3_NOCOLLAPSE_DEFS = '$1\/** @nocollapse *\/ $2';
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const R3_NOCOLLAPSE_TSICKLE_DECL = '$1@nocollapse $2';
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export function nocollapseHack(contents: string): string {
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return contents.replace(R3_MATCH_DEFS, R3_NOCOLLAPSE_DEFS)
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.replace(R3_MATCH_TSICKLE_DECL, R3_NOCOLLAPSE_TSICKLE_DECL);
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}
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