simplifyIfStatements() — react Function Reference

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

Function typescript BabelCompiler Optimization calls 1

Entity Profile

BabelCompiler→ Optimization→ simplifyIfStatements() — react Function Reference

Dependency Diagram

graph TD
  164c540b_5cfd_4c48_b5ed_eb75e34573ad["simplifyIfStatements()"]
  9c061da8_dbf8_4168_823d_991654a3c55d["minimize.ts"]
  164c540b_5cfd_4c48_b5ed_eb75e34573ad -->|defined in| 9c061da8_dbf8_4168_823d_991654a3c55d
  7a9af496_ef6a_d9e8_8eaf_1f386f49e4b3["cloneAst()"]
  164c540b_5cfd_4c48_b5ed_eb75e34573ad -->|calls| 7a9af496_ef6a_d9e8_8eaf_1f386f49e4b3
  style 164c540b_5cfd_4c48_b5ed_eb75e34573ad fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

compiler/packages/snap/src/minimize.ts lines 583–657

function* simplifyIfStatements(ast: t.File): Generator<t.File> {
  // Count if statements
  let ifCount = 0;
  t.traverseFast(ast, node => {
    if (t.isIfStatement(node)) {
      ifCount++;
    }
  });

  // Try replacing with test expression
  for (let targetIdx = 0; targetIdx < ifCount; targetIdx++) {
    const cloned = cloneAst(ast);
    let idx = 0;
    let modified = false;

    traverse(cloned, {
      IfStatement(path) {
        if (modified) return;
        if (idx === targetIdx) {
          path.replaceWith(t.expressionStatement(path.node.test));
          modified = true;
        }
        idx++;
      },
    });

    if (modified) {
      yield cloned;
    }
  }

  // Try replacing with consequent
  for (let targetIdx = 0; targetIdx < ifCount; targetIdx++) {
    const cloned = cloneAst(ast);
    let idx = 0;
    let modified = false;

    traverse(cloned, {
      IfStatement(path) {
        if (modified) return;
        if (idx === targetIdx) {
          path.replaceWith(path.node.consequent);
          modified = true;
        }
        idx++;
      },
    });

    if (modified) {
      yield cloned;
    }
  }

  // Try replacing with alternate (if present)
  for (let targetIdx = 0; targetIdx < ifCount; targetIdx++) {
    const cloned = cloneAst(ast);
    let idx = 0;
    let modified = false;

    traverse(cloned, {
      IfStatement(path) {
        if (modified) return;
        if (idx === targetIdx && path.node.alternate) {
          path.replaceWith(path.node.alternate);
          modified = true;
        }
        idx++;
      },
    });

    if (modified) {
      yield cloned;
    }
  }
}