warnOnInvalidCallback() — react Function Reference

Architecture documentation for the warnOnInvalidCallback() function in ReactFizzClassComponent.js from the react codebase.

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Entity Profile

BabelCompiler→ Validation→ warnOnInvalidCallback() — react Function Reference

Dependency Diagram

graph TD
  039d1d7b_9662_ee73_5d9a_e3cff4732a32["warnOnInvalidCallback()"]
  8f850c79_0562_f37f_80ff_563c50cd0996["ReactFizzClassComponent.js"]
  039d1d7b_9662_ee73_5d9a_e3cff4732a32 -->|defined in| 8f850c79_0562_f37f_80ff_563c50cd0996
  style 039d1d7b_9662_ee73_5d9a_e3cff4732a32 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/react-server/src/ReactFizzClassComponent.js lines 47–63

function warnOnInvalidCallback(callback: mixed) {
  if (__DEV__) {
    if (callback === null || typeof callback === 'function') {
      return;
    }
    // eslint-disable-next-line react-internal/safe-string-coercion
    const key = String(callback);
    if (!didWarnOnInvalidCallback.has(key)) {
      didWarnOnInvalidCallback.add(key);
      console.error(
        'Expected the last optional `callback` argument to be a ' +
          'function. Instead received: %s.',
        callback,
      );
    }
  }
}