Function isFunction

client/shared/guards/is-function/is-function.function.ts:1–7

(functionToCheck: unknown)

export const isFunction = (functionToCheck: unknown): functionToCheck is Function =>
  !!(
    typeof functionToCheck === 'function' &&
    !!functionToCheck.constructor &&
    !!functionToCheck.call &&
    !!functionToCheck.apply
  );