/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * * @flow * @format * @oncall react_native */ 'use strict'; import type {SourcePosition} from './Consumer/types.flow'; import type {IConsumer, MixedSourceMap} from './source-map'; import type {Number0, Number1} from 'ob1'; const Consumer = require('./Consumer'); const {SourceMapGenerator} = require('source-map'); // TODO(t67648443): Bypass the `sort-requires` rule for this file because of a dependency cycle. Consumer; // Originally based on https://github.com/jakobwesthoff/source-map-merger function composeSourceMaps( maps: $ReadOnlyArray, ): MixedSourceMap { // NOTE: require() here to break dependency cycle const SourceMetadataMapConsumer = require('metro-symbolicate/src/SourceMetadataMapConsumer'); const GoogleIgnoreListConsumer = require('metro-symbolicate/src/GoogleIgnoreListConsumer'); if (maps.length < 1) { throw new Error('composeSourceMaps: Expected at least one map'); } const firstMap = maps[0]; const consumers = maps .map(function (map) { return new Consumer(map); }) .reverse(); const generator = new SourceMapGenerator({ file: consumers[0].file, }); consumers[0].eachMapping(mapping => { const original = findOriginalPosition( consumers, mapping.generatedLine, mapping.generatedColumn, ); generator.addMapping({ generated: { line: mapping.generatedLine, column: mapping.generatedColumn, }, original: original.line != null ? { line: original.line, column: original.column, } : null, source: original.source, name: original.name, }); }); const composedMap = generator.toJSON(); composedMap.sourcesContent = composedMap.sources.map(source => consumers[consumers.length - 1].sourceContentFor(source, true), ); if (composedMap.sourcesContent.every(content => content == null)) { delete composedMap.sourcesContent; } const metadataConsumer = new SourceMetadataMapConsumer(firstMap); composedMap.x_facebook_sources = metadataConsumer.toArray( composedMap.sources, ); const function_offsets = maps[maps.length - 1].x_hermes_function_offsets; if (function_offsets) { composedMap.x_hermes_function_offsets = function_offsets; } const ignoreListConsumer = new GoogleIgnoreListConsumer(firstMap); const x_google_ignoreList = ignoreListConsumer.toArray(composedMap.sources); if (x_google_ignoreList.length) { composedMap.x_google_ignoreList = x_google_ignoreList; } return composedMap; } function findOriginalPosition( consumers: $ReadOnlyArray, generatedLine: Number1, generatedColumn: Number0, ): { line: ?number, column: ?number, source: ?string, name: ?string, ... } { let currentLine: ?Number1 = generatedLine; let currentColumn: ?Number0 = generatedColumn; let original: SourcePosition = { line: null, column: null, source: null, name: null, }; for (const consumer of consumers) { if (currentLine == null || currentColumn == null) { return {line: null, column: null, source: null, name: null}; } original = consumer.originalPositionFor({ line: currentLine, column: currentColumn, }); currentLine = original.line; currentColumn = original.column; if (currentLine == null) { return { line: null, column: null, source: null, name: null, }; } } // $FlowFixMe[incompatible-return] `Number0`, `Number1` is incompatible with number return original; } module.exports = composeSourceMaps;