parseSourceMaps() — react Function Reference

Architecture documentation for the parseSourceMaps() function in parseSourceAndMetadata.js from the react codebase.

Function javascript BabelCompiler Validation called by 1

Entity Profile

BabelCompiler→ Validation→ parseSourceMaps() — react Function Reference

Dependency Diagram

graph TD
  8c28c20e_c018_805c_fb8b_af3ef055a8d3["parseSourceMaps()"]
  76da1f28_5fe1_2c37_5657_67756acc6f55["parseSourceAndMetadata.js"]
  8c28c20e_c018_805c_fb8b_af3ef055a8d3 -->|defined in| 76da1f28_5fe1_2c37_5657_67756acc6f55
  fba84d46_f44f_7ea7_9af3_a0121e3e1415["parseSourceAndMetadata()"]
  fba84d46_f44f_7ea7_9af3_a0121e3e1415 -->|calls| 8c28c20e_c018_805c_fb8b_af3ef055a8d3
  style 8c28c20e_c018_805c_fb8b_af3ef055a8d3 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/react-devtools-shared/src/hooks/parseHookNames/parseSourceAndMetadata.js lines 383–436

function parseSourceMaps(
  locationKeyToHookSourceAndMetadata: LocationKeyToHookSourceAndMetadata,
  locationKeyToHookParsedMetadata: LocationKeyToHookParsedMetadata,
) {
  locationKeyToHookSourceAndMetadata.forEach(
    (hookSourceAndMetadata, locationKey) => {
      const hookParsedMetadata =
        locationKeyToHookParsedMetadata.get(locationKey);
      if (hookParsedMetadata == null) {
        throw Error(`Expected to find HookParsedMetadata for "${locationKey}"`);
      }

      const {runtimeSourceURL, sourceMapJSON} = hookSourceAndMetadata;

      // If we've already loaded the source map info for this file,
      // we can skip reloading it (and more importantly, re-parsing it).
      const runtimeMetadata = runtimeURLToMetadataCache.get(runtimeSourceURL);
      if (runtimeMetadata != null) {
        if (__DEBUG__) {
          console.groupCollapsed(
            `parseHookNames() Found cached runtime metadata for file "${runtimeSourceURL}"`,
          );
          console.log(runtimeMetadata);
          console.groupEnd();
        }

        hookParsedMetadata.metadataConsumer = runtimeMetadata.metadataConsumer;
        hookParsedMetadata.sourceMapConsumer =
          runtimeMetadata.sourceMapConsumer;
      } else {
        if (sourceMapJSON != null) {
          const sourceMapConsumer = withSyncPerfMeasurements(
            'new SourceMapConsumer(sourceMapJSON)',
            () => SourceMapConsumer(sourceMapJSON),
          );

          const metadataConsumer = withSyncPerfMeasurements(
            'new SourceMapMetadataConsumer(sourceMapJSON)',
            () => new SourceMapMetadataConsumer(sourceMapJSON),
          );

          hookParsedMetadata.metadataConsumer = metadataConsumer;
          hookParsedMetadata.sourceMapConsumer = sourceMapConsumer;

          // Only set once to avoid triggering eviction/cleanup code.
          runtimeURLToMetadataCache.set(runtimeSourceURL, {
            metadataConsumer: metadataConsumer,
            sourceMapConsumer: sourceMapConsumer,
          });
        }
      }
    },
  );
}