simplifySingleElementArrays() — react Function Reference

Architecture documentation for the simplifySingleElementArrays() function in minimize.ts from the react codebase.

Function typescript BabelCompiler Optimization calls 1

Entity Profile

BabelCompiler→ Optimization→ simplifySingleElementArrays() — react Function Reference

Dependency Diagram

graph TD
  871b0e95_67b4_96c3_fab7_fa7db0ca6929["simplifySingleElementArrays()"]
  9c061da8_dbf8_4168_823d_991654a3c55d["minimize.ts"]
  871b0e95_67b4_96c3_fab7_fa7db0ca6929 -->|defined in| 9c061da8_dbf8_4168_823d_991654a3c55d
  7a9af496_ef6a_d9e8_8eaf_1f386f49e4b3["cloneAst()"]
  871b0e95_67b4_96c3_fab7_fa7db0ca6929 -->|calls| 7a9af496_ef6a_d9e8_8eaf_1f386f49e4b3
  style 871b0e95_67b4_96c3_fab7_fa7db0ca6929 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

compiler/packages/snap/src/minimize.ts lines 1473–1505

function* simplifySingleElementArrays(ast: t.File): Generator<t.File> {
  // Count single-element arrays
  let arrayCount = 0;
  t.traverseFast(ast, node => {
    if (t.isArrayExpression(node) && node.elements.length === 1) {
      arrayCount++;
    }
  });

  for (let targetIdx = 0; targetIdx < arrayCount; targetIdx++) {
    const cloned = cloneAst(ast);
    let idx = 0;
    let modified = false;

    traverse(cloned, {
      ArrayExpression(path) {
        if (modified) return;
        if (path.node.elements.length === 1 && idx === targetIdx) {
          const elem = path.node.elements[0];
          if (t.isExpression(elem)) {
            path.replaceWith(elem);
            modified = true;
          }
        }
        idx++;
      },
    });

    if (modified) {
      yield cloned;
    }
  }
}