react-native-worklets/lib/module/workletFunction.js

The React Native multithreading library

'use strict';

/**
 * This function allows you to determine if a given function is a worklet. It
 * only works with Worklets Babel plugin enabled. Unless you are doing something
 * with internals of Worklets you shouldn't need to use this function.
 *
 * ### Note
 *
 * Do not call it before the worklet is declared, as it will always return false
 * then. E.g.:
 *
 * ```ts
 * isWorkletFunction(myWorklet); // Will always return false.
 *
 * function myWorklet() {
 *   'worklet';
 * }
 * ```
 *
 * ### Maintainer note
 *
 * This function is supposed to be used only in the React Runtime. It always
 * returns `false` in Worklet Runtimes.
 */
export function isWorkletFunction(value) {
  'worklet';

  // Since host objects always return true for `in` operator, we have to use dot notation to check if the property exists.
  // See https://github.com/facebook/hermes/blob/340726ef8cf666a7cce75bc60b02fa56b3e54560/lib/VM/JSObject.cpp#L1276.
  return (
    // `__workletHash` isn't extracted in Worklet Runtimes.
    typeof value === 'function' && !!value.__workletHash
  );
}
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