Function callHook

packages/runtime-dom/src/components/Transition.ts:96–105

(
  hook: Function | Function[] | undefined,
  args: any[] = [],
)

 * with custom HOCs.
 */
const callHook = (
  hook: Function | Function[] | undefined,
  args: any[] = [],
) => {
  if (isArray(hook)) {
    hook.forEach(h => h(...args))
  } else if (hook) {
    hook(...args)
  }
}

/**
 * Check if a hook expects a callback (2nd arg), which means the user