updateLaneToLabelMap() — react Function Reference

Architecture documentation for the updateLaneToLabelMap() function in preprocessData.js from the react codebase.

Function javascript BabelCompiler Validation called by 1

Entity Profile

BabelCompiler→ Validation→ updateLaneToLabelMap() — react Function Reference

Dependency Diagram

graph TD
  95d63b61_4fb5_111c_5ac6_d1f83c8fe393["updateLaneToLabelMap()"]
  a3f7147d_da0b_56dc_ffc9_a9e2bbc4526a["preprocessData.js"]
  95d63b61_4fb5_111c_5ac6_d1f83c8fe393 -->|defined in| a3f7147d_da0b_56dc_ffc9_a9e2bbc4526a
  7e379096_4ef1_e90c_7e2b_b822b6321992["processTimelineEvent()"]
  7e379096_4ef1_e90c_7e2b_b822b6321992 -->|calls| 95d63b61_4fb5_111c_5ac6_d1f83c8fe393
  style 95d63b61_4fb5_111c_5ac6_d1f83c8fe393 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/react-devtools-timeline/src/import-worker/preprocessData.js lines 108–123

function updateLaneToLabelMap(
  profilerData: TimelineData,
  laneLabelTuplesString: string,
): void {
  // These marks appear multiple times in the data;
  // We only need to extact them once.
  if (profilerData.laneToLabelMap.size === 0) {
    const laneLabelTuples = laneLabelTuplesString.split(',');
    for (let laneIndex = 0; laneIndex < laneLabelTuples.length; laneIndex++) {
      // The numeric lane value (e.g. 64) isn't important.
      // The profiler parses and stores the lane's position within the bitmap,
      // (e.g. lane 1 is index 0, lane 16 is index 4).
      profilerData.laneToLabelMap.set(laneIndex, laneLabelTuples[laneIndex]);
    }
  }
}