SourceMapConsumer.js — react Source File

Source Code

/**
 * 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
 */
import {withSyncPerfMeasurements} from 'react-devtools-shared/src/PerformanceLoggingUtils';
import {decode} from '@jridgewell/sourcemap-codec';

import type {
  IndexSourceMap,
  IndexSourceMapSection,
  BasicSourceMap,
  MixedSourceMap,
} from './SourceMapTypes';

type SearchPosition = {
  columnNumber: number,
  lineNumber: number,
};

type ResultPosition = {
  column: number,
  line: number,
  sourceContent: string | null,
  sourceURL: string | null,
  ignored: boolean,
};

export type SourceMapConsumerType = {
  originalPositionFor: SearchPosition => ResultPosition,
};

type Mappings = Array<Array<Array<number>>>;

export default function SourceMapConsumer(
  sourceMapJSON: MixedSourceMap | IndexSourceMapSection,
): SourceMapConsumerType {
  if (sourceMapJSON.sections != null) {
    return IndexedSourceMapConsumer(((sourceMapJSON: any): IndexSourceMap));
  } else {
    return BasicSourceMapConsumer(((sourceMapJSON: any): BasicSourceMap));
  }
}

function BasicSourceMapConsumer(sourceMapJSON: BasicSourceMap) {
  const decodedMappings: Mappings = withSyncPerfMeasurements(
    'Decoding source map mappings with @jridgewell/sourcemap-codec',
    () => decode(sourceMapJSON.mappings),
  );

  function originalPositionFor({
    columnNumber,
    lineNumber,
  }: SearchPosition): ResultPosition {
    // Error.prototype.stack columns are 1-based (like most IDEs) but ASTs are 0-based.
    const targetColumnNumber = columnNumber - 1;

// ... (178 more lines)