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

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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 });

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