makeFinallyBlock() — react Function Reference

Architecture documentation for the makeFinallyBlock() function in code-path-state.js from the react codebase.

Function javascript BabelCompiler Validation calls 2

Entity Profile

BabelCompiler→ Validation→ makeFinallyBlock() — react Function Reference

Dependency Diagram

graph TD
  fe72461c_79f6_2f70_143a_d0976fabdb0c["makeFinallyBlock()"]
  d3cee22c_5e2d_f853_c075_2c7c55e5d22c["CodePathState"]
  fe72461c_79f6_2f70_143a_d0976fabdb0c -->|defined in| d3cee22c_5e2d_f853_c075_2c7c55e5d22c
  4581c407_1b84_6f80_c60d_80725b7a3917["popForkContext()"]
  fe72461c_79f6_2f70_143a_d0976fabdb0c -->|calls| 4581c407_1b84_6f80_c60d_80725b7a3917
  fcc7c411_4c84_b9a2_79b5_df3d388d50fc["pushForkContext()"]
  fe72461c_79f6_2f70_143a_d0976fabdb0c -->|calls| fcc7c411_4c84_b9a2_79b5_df3d388d50fc
  style fe72461c_79f6_2f70_143a_d0976fabdb0c fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/eslint-plugin-react-hooks/src/code-path-analysis/code-path-state.js lines 864–914

  makeFinallyBlock() {
    const context = this.tryContext;
    let forkContext = this.forkContext;
    const returned = context.returnedForkContext;
    const thrown = context.thrownForkContext;
    const headOfLeavingSegments = forkContext.head;

    // Update state.
    if (context.position === 'catch') {
      // Merges two paths from the `try` block and `catch` block.
      this.popForkContext();
      forkContext = this.forkContext;

      context.lastOfCatchIsReachable = forkContext.reachable;
    } else {
      context.lastOfTryIsReachable = forkContext.reachable;
    }
    context.position = 'finally';

    if (returned.empty && thrown.empty) {
      // This path does not leave.
      return;
    }

    /*
     * Create a parallel segment from merging returned and thrown.
     * This segment will leave at the end of this finally block.
     */
    const segments = forkContext.makeNext(-1, -1);

    for (let i = 0; i < forkContext.count; ++i) {
      const prevSegsOfLeavingSegment = [headOfLeavingSegments[i]];

      for (let j = 0; j < returned.segmentsList.length; ++j) {
        prevSegsOfLeavingSegment.push(returned.segmentsList[j][i]);
      }
      for (let j = 0; j < thrown.segmentsList.length; ++j) {
        prevSegsOfLeavingSegment.push(thrown.segmentsList[j][i]);
      }

      segments.push(
        CodePathSegment.newNext(
          this.idGenerator.next(),
          prevSegsOfLeavingSegment,
        ),
      );
    }

    this.pushForkContext(true);
    this.forkContext.add(segments);
  }