fc93dafab1
Module defs are not considered public API, so the property
that contains them should be prefixed with Angular's marker
for "private" ('ɵ') to discourage apps from relying on def
APIs directly.
This commit adds the prefix and shortens the name from
ngModuleDef to mod. This is because property names
cannot be minified by Uglify without turning on property
mangling (which most apps have turned off) and are thus
size-sensitive.
PR Close #33142
60 lines
2.5 KiB
TypeScript
60 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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'ɵcmp',
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'ɵdir',
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'ngInjectableDef',
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'ngInjectorDef',
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'ɵmod',
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'ɵpipe',
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'ɵfac',
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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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