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