switch() — react Function Reference

Architecture documentation for the switch() function in HIRBuilder.ts from the react codebase.

Function typescript MIRInfrastructure HIR calls 2

Entity Profile

MIRInfrastructure→ HIR→ switch() — react Function Reference

Dependency Diagram

graph TD
  0a9966a2_2d1e_317c_367a_626218fcea7b["switch()"]
  d1b85268_f4cd_bc3c_7ba0_ee15dcc8a845["HIRBuilder"]
  0a9966a2_2d1e_317c_367a_626218fcea7b -->|defined in| d1b85268_f4cd_bc3c_7ba0_ee15dcc8a845
  53244187_914c_cc90_5880_7bfc1fc9c0bb["push()"]
  0a9966a2_2d1e_317c_367a_626218fcea7b -->|calls| 53244187_914c_cc90_5880_7bfc1fc9c0bb
  041ca752_10c1_3cda_1f5c_02f44a01310e["invariant()"]
  0a9966a2_2d1e_317c_367a_626218fcea7b -->|calls| 041ca752_10c1_3cda_1f5c_02f44a01310e
  style 0a9966a2_2d1e_317c_367a_626218fcea7b fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

compiler/packages/babel-plugin-react-compiler/src/HIR/HIRBuilder.ts lines 515–534

  switch<T>(label: string | null, breakBlock: BlockId, fn: () => T): T {
    this.#scopes.push({
      kind: 'switch',
      breakBlock,
      label,
    });
    const value = fn();
    const last = this.#scopes.pop();
    CompilerError.invariant(
      last != null &&
        last.kind === 'switch' &&
        last.label === label &&
        last.breakBlock === breakBlock,
      {
        reason: 'Mismatched label',
        loc: GeneratedSource,
      },
    );
    return value;
  }