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Account for injectManifest replacements in sourcemaps (#2239)
* Fix sourcemaps in injectManifest mode * Linting workaround * config => options
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108 changes: 108 additions & 0 deletions
108
packages/workbox-build/src/lib/replace-and-update-source-map.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| Copyright 2019 Google LLC | ||
| Use of this source code is governed by an MIT-style | ||
| license that can be found in the LICENSE file or at | ||
| https://opensource.org/licenses/MIT. | ||
| */ | ||
|
|
||
| const {SourceMapConsumer, SourceMapGenerator} = require('source-map'); | ||
|
|
||
| /** | ||
| * Adapted from https://github.com/nsams/sourcemap-aware-replace, with modern | ||
| * JavaScript updates, along with additional properties copied from originalMap. | ||
| * | ||
| * @param {Object} options | ||
| * @param {string} options.jsFilename The name for the file whose contents | ||
| * correspond to originalSource. | ||
| * @param {Object} options.originalMap The sourcemap for originalSource, | ||
| * prior to any replacements. | ||
| * @param {string} options.originalSource The source code, prior to any | ||
| * replacements. | ||
| * @param {string} options.replaceString A string to swap in for searchString. | ||
| * @param {string} options.searchString A string in originalSource to replace. | ||
| * Only the first occurrence will be replaced. | ||
| * @return {{source: string, map: string}} An object containing both | ||
| * originalSource with the replacement applied, and the modified originalMap. | ||
| * | ||
| * @private | ||
| */ | ||
| async function replaceAndUpdateSourceMap({ | ||
| jsFilename, | ||
| originalMap, | ||
| originalSource, | ||
| replaceString, | ||
| searchString, | ||
| }) { | ||
| const generator = new SourceMapGenerator({ | ||
| file: jsFilename, | ||
| }); | ||
|
|
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| const consumer = await new SourceMapConsumer(originalMap); | ||
|
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| let pos; | ||
| let src = originalSource; | ||
| const replacements = []; | ||
| let lineNum = 0; | ||
| let filePos = 0; | ||
|
|
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| const lines = src.split('\n'); | ||
| for (let line of lines) { | ||
| lineNum++; | ||
| let searchPos = 0; | ||
| while ((pos = line.indexOf(searchString, searchPos)) !== -1) { | ||
| src = src.substring(0, filePos + pos) + replaceString + | ||
| src.substring(filePos + pos + searchString.length); | ||
| line = line.substring(0, pos) + replaceString + | ||
| line.substring(pos + searchString.length); | ||
| replacements.push({line: lineNum, column: pos}); | ||
| searchPos = pos + replaceString.length; | ||
| } | ||
| filePos += line.length + 1; | ||
| } | ||
|
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| replacements.reverse(); | ||
|
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| consumer.eachMapping((mapping) => { | ||
| for (const replacement of replacements) { | ||
| if (replacement.line == mapping.generatedLine && | ||
| mapping.generatedColumn > replacement.column) { | ||
| const offset = searchString.length - replaceString.length; | ||
| mapping.generatedColumn -= offset; | ||
| } | ||
| } | ||
|
|
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| if (mapping.source) { | ||
| const newMapping = { | ||
| generated: { | ||
| line: mapping.generatedLine, | ||
| column: mapping.generatedColumn, | ||
| }, | ||
| original: { | ||
| line: mapping.originalLine, | ||
| column: mapping.originalColumn, | ||
| }, | ||
| source: mapping.source, | ||
| }; | ||
| return generator.addMapping(newMapping); | ||
| } | ||
|
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| return mapping; | ||
| }); | ||
|
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| consumer.destroy(); | ||
|
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| const updatedSourceMap = Object.assign(JSON.parse(generator.toString()), { | ||
| names: originalMap.names, | ||
| sourceRoot: originalMap.sourceRoot, | ||
| sources: originalMap.sources, | ||
| sourcesContent: originalMap.sourcesContent, | ||
| }); | ||
|
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| return { | ||
| map: JSON.stringify(updatedSourceMap), | ||
| source: src, | ||
| }; | ||
| } | ||
|
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| module.exports = replaceAndUpdateSourceMap; |
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