isChildPublicInstance() — react Function Reference

Architecture documentation for the isChildPublicInstance() function in ReactNativePublicCompat.js from the react codebase.

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Entity Profile

BabelCompiler→ Validation→ isChildPublicInstance() — react Function Reference

Dependency Diagram

graph TD
  38298ff1_0df9_bd75_4ee6_624ce5b5207d["isChildPublicInstance()"]
  c8cde18a_a62b_2ad5_9e88_a5d655a07f02["ReactNativePublicCompat.js"]
  38298ff1_0df9_bd75_4ee6_624ce5b5207d -->|defined in| c8cde18a_a62b_2ad5_9e88_a5d655a07f02
  style 38298ff1_0df9_bd75_4ee6_624ce5b5207d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/react-native-renderer/src/ReactNativePublicCompat.js lines 227–272

export function isChildPublicInstance(
  parentInstance: PublicInstance,
  childInstance: PublicInstance,
): boolean {
  if (__DEV__) {
    // Paper
    if (
      // $FlowExpectedError[incompatible-type]
      // $FlowExpectedError[prop-missing] Don't check via `instanceof ReactNativeFiberHostComponent`, so it won't be leaked to Fabric.
      parentInstance._internalFiberInstanceHandleDEV &&
      // $FlowExpectedError[incompatible-type]
      // $FlowExpectedError[prop-missing] Don't check via `instanceof ReactNativeFiberHostComponent`, so it won't be leaked to Fabric.
      childInstance._internalFiberInstanceHandleDEV
    ) {
      return doesFiberContain(
        // $FlowExpectedError[incompatible-call]
        parentInstance._internalFiberInstanceHandleDEV,
        // $FlowExpectedError[incompatible-call]
        childInstance._internalFiberInstanceHandleDEV,
      );
    }

    const parentInternalInstanceHandle =
      // $FlowExpectedError[incompatible-call] Type for parentInstance should have been PublicInstance from ReactFiberConfigFabric.
      getInternalInstanceHandleFromPublicInstance(parentInstance);
    const childInternalInstanceHandle =
      // $FlowExpectedError[incompatible-call] Type for childInstance should have been PublicInstance from ReactFiberConfigFabric.
      getInternalInstanceHandleFromPublicInstance(childInstance);

    // Fabric
    if (
      parentInternalInstanceHandle != null &&
      childInternalInstanceHandle != null
    ) {
      return doesFiberContain(
        parentInternalInstanceHandle,
        childInternalInstanceHandle,
      );
    }

    // Means that one instance is from Fabric and other is from Paper.
    return false;
  } else {
    throw new Error('isChildPublicInstance() is not available in production.');
  }
}