mirror of
https://github.com/status-im/react-native.git
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f99468de65
Summary:This rev adds support for production sourcemaps on RAM. When we inject a module into JSC we use the original `sourceURL` and specify the `startingLineNumber` of the module relative to a "regular" bundle. By doing so, when an error is thrown, JSC will include the provided `sourceURL` as the filename and will use the indicated `startingLineNumber` to figure out on which line the error actually occurred. To make things a bit simpler and avoid having to deal with columns, we tweak the generated bundle so that each module starts on a new line. Since we cannot assure that each module's code will be on a single line as the minifier might break it on multiple (UglifyJS does so due to a bug on old versions of Chrome), we include on the index the line number that should be used when invoking `JSEvaluateScript`. Since the module length was not being used we replaced the placeholder we have there for the line number. Reviewed By: javache Differential Revision: D2997520 fb-gh-sync-id: 3243a489cbb5b48a963f4ccdd98ba63b30f53f3f shipit-source-id: 3243a489cbb5b48a963f4ccdd98ba63b30f53f3f
60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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const sourceMap = require('source-map');
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const SourceMapConsumer = sourceMap.SourceMapConsumer;
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/**
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* Builds the sourcemaps for any type of unbundle provided the Bundle that
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* contains the modules reachable from the entry point.
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*
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* The generated sourcemaps correspond to a regular bundle on which each module
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* starts on a new line. Depending on the type of unbundle you're using, you
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* will have to pipe the line number to native and use it when injecting the
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* module's code into JSC. This way, we'll trick JSC to believe all the code is
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* on a single big regular bundle where as it could be on an indexed bundle or
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* as sparsed assets.
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*/
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function buildUnbundleSourcemap(bundle) {
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const generator = new sourceMap.SourceMapGenerator({});
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const nonPolyfillModules = bundle.getModules().filter(module =>
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!module.polyfill
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);
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let offset = 1;
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nonPolyfillModules.forEach(module => {
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if (module.map) { // assets have no sourcemap
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const consumer = new SourceMapConsumer(module.map);
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consumer.eachMapping(mapping => {
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generator.addMapping({
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original: {
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line: mapping.originalLine,
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column: mapping.originalColumn,
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},
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generated: {
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line: mapping.generatedLine + offset,
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column: mapping.generatedColumn,
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},
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source: module.sourcePath,
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});
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});
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generator.setSourceContent(module.sourcePath, module.sourceCode);
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}
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// some modules span more than 1 line
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offset += module.code.split('\n').length;
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});
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return generator.toString();
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}
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module.exports = buildUnbundleSourcemap;
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