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https://github.com/angular/angular
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d42ed733d8
The source-map package now requires the `SourceMapConsumer`/`SourceMapGenerator` classes to be instantiated asynchronously. This commit updates our tests to account for that. PR Close #46888
40 lines
1.5 KiB
TypeScript
40 lines
1.5 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 {SourceMap} from '@angular/compiler';
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import b64 from 'base64-js';
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import {SourceMapConsumer} from 'source-map';
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export interface SourceLocation {
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line: number|null;
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column: number|null;
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source: string|null;
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}
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export async function originalPositionFor(
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sourceMap: SourceMap, genPosition: {line: number, column: number}): Promise<SourceLocation> {
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// Note: The `SourceMap` type from the compiler is different to `RawSourceMap`
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// from the `source-map` package, but the method we rely on works as expected.
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const smc = await new SourceMapConsumer(sourceMap as any);
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// Note: We don't return the original object as it also contains a `name` property
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// which is always null and we don't want to include that in our assertions...
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const {line, column, source} = smc.originalPositionFor(genPosition);
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return {line, column, source};
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}
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export function extractSourceMap(source: string): SourceMap|null {
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let idx = source.lastIndexOf('\n//#');
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if (idx == -1) return null;
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const smComment = source.slice(idx).split('\n', 2)[1].trim();
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const smB64 = smComment.split('sourceMappingURL=data:application/json;base64,')[1];
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return smB64 ? JSON.parse(decodeB64String(smB64)) as SourceMap : null;
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}
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function decodeB64String(s: string): string {
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return b64.toByteArray(s).reduce((s: string, c: number) => s + String.fromCharCode(c), '');
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}
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