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How to use 'javascript check if function exists' in JavaScript

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NEEOInc/neeo-sdk
241function checkForFunction<
242  T extends ((id: string) => void) | PromiseLike | Models.Discovery.Controller
243>(func: T) {
244  return new Promise((resolve, reject) => {
245    return typeof func !== 'function'
246      ? reject(new Error('CONTROLLER_IS_NOT_A_FUNCTION'))
247      : resolve(func);
248  });
249}

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