shard() — react Function Reference

Architecture documentation for the shard() function in sizeBalancedSequencer.js from the react codebase.

Function javascript BabelCompiler Optimization

Entity Profile

BabelCompiler→ Optimization→ shard() — react Function Reference

Dependency Diagram

graph TD
  13bd7e35_bfa6_8197_e4d0_18e7848a95ec["shard()"]
  cd4a7434_6c24_7483_a873_cfa223a77943["SizeBalancedSequencer"]
  13bd7e35_bfa6_8197_e4d0_18e7848a95ec -->|defined in| cd4a7434_6c24_7483_a873_cfa223a77943
  style 13bd7e35_bfa6_8197_e4d0_18e7848a95ec fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

scripts/jest/sizeBalancedSequencer.js lines 7–25

  shard(tests, {shardIndex, shardCount}) {
    const shards = Array.from({length: shardCount}, () => ({
      tests: [],
      size: 0,
    }));
    const sorted = [...tests].sort(
      (a, b) => fs.statSync(b.path).size - fs.statSync(a.path).size
    );

    for (let i = 0; i < sorted.length; i++) {
      const test = sorted[i];
      const size = fs.statSync(test.path).size;
      const smallest = shards.reduce((min, s) => (s.size < min.size ? s : min));
      smallest.tests.push(test);
      smallest.size += size;
    }

    return shards[shardIndex - 1].tests;
  }