processChildContext() — react Function Reference

Architecture documentation for the processChildContext() function in ReactFizzLegacyContext.js from the react codebase.

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Entity Profile

BabelCompiler→ Validation→ processChildContext() — react Function Reference

Dependency Diagram

graph TD
  0de4544a_f806_f825_c1b6_b15f8acb1ac0["processChildContext()"]
  4825696d_2f43_1121_7cc9_951fbe850d0a["ReactFizzLegacyContext.js"]
  0de4544a_f806_f825_c1b6_b15f8acb1ac0 -->|defined in| 4825696d_2f43_1121_7cc9_951fbe850d0a
  style 0de4544a_f806_f825_c1b6_b15f8acb1ac0 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/react-server/src/ReactFizzLegacyContext.js lines 42–83

export function processChildContext(
  instance: any,
  type: any,
  parentContext: Object,
  childContextTypes: Object,
): Object {
  if (disableLegacyContext) {
    return parentContext;
  } else {
    // TODO (bvaughn) Replace this behavior with an invariant() in the future.
    // It has only been added in Fiber to match the (unintentional) behavior in Stack.
    if (typeof instance.getChildContext !== 'function') {
      if (__DEV__) {
        const componentName = getComponentNameFromType(type) || 'Unknown';

        if (!warnedAboutMissingGetChildContext[componentName]) {
          warnedAboutMissingGetChildContext[componentName] = true;
          console.error(
            '%s.childContextTypes is specified but there is no getChildContext() method ' +
              'on the instance. You can either define getChildContext() on %s or remove ' +
              'childContextTypes from it.',
            componentName,
            componentName,
          );
        }
      }
      return parentContext;
    }

    const childContext = instance.getChildContext();
    for (const contextKey in childContext) {
      if (!(contextKey in childContextTypes)) {
        throw new Error(
          `${
            getComponentNameFromType(type) || 'Unknown'
          }.getChildContext(): key "${contextKey}" is not defined in childContextTypes.`,
        );
      }
    }
    return {...parentContext, ...childContext};
  }
}