0a8e8cd1f3
The library used by ngcc to update the source files (MagicString) is able to generate a source-map but it is not able to account for any previous source-map that the input text is already associated with. There have been various attempts to fix this but none have been very successful, since it is not a trivial problem to solve. This commit contains a novel approach that is able to load up a tree of source-files connected by source-maps and flatten them down into a single source-map that maps directly from the final generated file to the original sources referenced by the intermediate source-maps. PR Close #35132
52 lines
2.1 KiB
TypeScript
52 lines
2.1 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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import {SourceMapConverter, fromObject, generateMapFileComment} from 'convert-source-map';
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import MagicString from 'magic-string';
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import * as ts from 'typescript';
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import {FileSystem, absoluteFromSourceFile, basename, absoluteFrom} from '../../../src/ngtsc/file_system';
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import {FileToWrite} from './utils';
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import {SourceFileLoader} from '../sourcemaps/source_file_loader';
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import {RawSourceMap} from '../sourcemaps/raw_source_map';
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export interface SourceMapInfo {
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source: string;
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map: SourceMapConverter|null;
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isInline: boolean;
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}
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/**
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* Merge the input and output source-maps, replacing the source-map comment in the output file
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* with an appropriate source-map comment pointing to the merged source-map.
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*/
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export function renderSourceAndMap(
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fs: FileSystem, sourceFile: ts.SourceFile, generatedMagicString: MagicString): FileToWrite[] {
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const generatedPath = absoluteFromSourceFile(sourceFile);
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const generatedMapPath = absoluteFrom(`${generatedPath}.map`);
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const generatedContent = generatedMagicString.toString();
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const generatedMap: RawSourceMap = generatedMagicString.generateMap(
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{file: generatedPath, source: generatedPath, includeContent: true});
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const loader = new SourceFileLoader(fs);
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const generatedFile = loader.loadSourceFile(
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generatedPath, generatedContent, {map: generatedMap, mapPath: generatedMapPath});
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const rawMergedMap: RawSourceMap = generatedFile.renderFlattenedSourceMap();
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const mergedMap = fromObject(rawMergedMap);
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if (generatedFile.sources[0]?.inline) {
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// The input source-map was inline so make the output one inline too.
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return [{path: generatedPath, contents: `${generatedFile.contents}\n${mergedMap.toComment()}`}];
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} else {
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const sourceMapComment = generateMapFileComment(`${basename(generatedPath)}.map`);
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return [
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{path: generatedPath, contents: `${generatedFile.contents}\n${sourceMapComment}`},
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{path: generatedMapPath, contents: mergedMap.toJSON()}
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];
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}
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}
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