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transformScope() — react Function Reference

Architecture documentation for the transformScope() function in PruneUnusedScopes.ts from the react codebase.

Function typescript BabelCompiler Validation calls 3

Entity Profile

Dependency Diagram

graph TD
  4f7ad929_f19e_7d55_33f1_e3306e7e41bc["transformScope()"]
  5a05f31c_ebbc_2227_1399_e3e8c8cbcfa3["Transform"]
  4f7ad929_f19e_7d55_33f1_e3306e7e41bc -->|defined in| 5a05f31c_ebbc_2227_1399_e3e8c8cbcfa3
  4acb57df_5348_9aab_9691_41cf35127db4["visitScope()"]
  4f7ad929_f19e_7d55_33f1_e3306e7e41bc -->|calls| 4acb57df_5348_9aab_9691_41cf35127db4
  b639747b_32c3_a4bf_867f_dba5d3901073["transformScope()"]
  4f7ad929_f19e_7d55_33f1_e3306e7e41bc -->|calls| b639747b_32c3_a4bf_867f_dba5d3901073
  63729a7b_662e_cdeb_1679_8ae36c41d27f["hasOwnDeclaration()"]
  4f7ad929_f19e_7d55_33f1_e3306e7e41bc -->|calls| 63729a7b_662e_cdeb_1679_8ae36c41d27f
  style 4f7ad929_f19e_7d55_33f1_e3306e7e41bc fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/PruneUnusedScopes.ts lines 38–65

  override transformScope(
    scopeBlock: ReactiveScopeBlock,
    _state: State,
  ): Transformed<ReactiveStatement> {
    const scopeState: State = {hasReturnStatement: false};
    this.visitScope(scopeBlock, scopeState);
    if (
      !scopeState.hasReturnStatement &&
      scopeBlock.scope.reassignments.size === 0 &&
      (scopeBlock.scope.declarations.size === 0 ||
        /*
         * Can prune scopes where all declarations bubbled up from inner
         * scopes
         */
        !hasOwnDeclaration(scopeBlock))
    ) {
      return {
        kind: 'replace',
        value: {
          kind: 'pruned-scope',
          scope: scopeBlock.scope,
          instructions: scopeBlock.instructions,
        },
      };
    } else {
      return {kind: 'keep'};
    }
  }

Domain

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Defined In

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Source

Frequently Asked Questions

What does transformScope() do?
transformScope() is a function in the react codebase, defined in compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/PruneUnusedScopes.ts.
Where is transformScope() defined?
transformScope() is defined in compiler/packages/babel-plugin-react-compiler/src/ReactiveScopes/PruneUnusedScopes.ts at line 38.
What does transformScope() call?
transformScope() calls 3 function(s): hasOwnDeclaration, transformScope, visitScope.

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