b45f336635
Inline source-maps in typings files can impact IDE performance so ngcc should only add such maps if the original typings file contains inline source-maps. Fixes #37324 PR Close #37363
74 lines
3.1 KiB
TypeScript
74 lines
3.1 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC 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 {fromObject, generateMapFileComment, SourceMapConverter} 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 {absoluteFrom, absoluteFromSourceFile, basename, FileSystem} from '../../../src/ngtsc/file_system';
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import {Logger} from '../logging/logger';
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import {RawSourceMap} from '../sourcemaps/raw_source_map';
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import {SourceFileLoader} from '../sourcemaps/source_file_loader';
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import {FileToWrite} from './utils';
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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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logger: Logger, fs: FileSystem, sourceFile: ts.SourceFile,
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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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try {
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const loader = new SourceFileLoader(fs, logger);
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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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const firstSource = generatedFile.sources[0];
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if (firstSource && (firstSource.rawMap !== null || !sourceFile.isDeclarationFile) &&
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firstSource.inline) {
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// We render an inline source map if one of:
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// * there was no input source map and this is not a typings file;
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// * the input source map exists and was inline.
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//
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// We do not generate inline source maps for typings files unless there explicitly was one in
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// the input file because these inline source maps can be very large and it impacts on the
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// performance of IDEs that need to read them to provide intellisense etc.
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return [
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{path: generatedPath, contents: `${generatedFile.contents}\n${mergedMap.toComment()}`}
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];
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} else {
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const sourceMapComment = generateMapFileComment(`${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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} catch (e) {
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logger.error(`Error when flattening the source-map "${generatedMapPath}" for "${
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generatedPath}": ${e.toString()}`);
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return [
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{path: generatedPath, contents: generatedContent},
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{path: generatedMapPath, contents: fromObject(generatedMap).toJSON()},
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];
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}
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}
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