Function computed

packages/reactivity/src/computed.ts:198–221

(
  getterOrOptions: ComputedGetter<T> | WritableComputedOptions<T>,
  debugOptions?: DebuggerOptions,
  isSSR = false,
)

): WritableComputedRef<T, S>
/*@__NO_SIDE_EFFECTS__*/
export function computed<T>(
  getterOrOptions: ComputedGetter<T> | WritableComputedOptions<T>,
  debugOptions?: DebuggerOptions,
  isSSR = false,
) {
  let getter: ComputedGetter<T>
  let setter: ComputedSetter<T> | undefined

  if (isFunction(getterOrOptions)) {
    getter = getterOrOptions
  } else {
    getter = getterOrOptions.get
    setter = getterOrOptions.set
  }

  const cRef = new ComputedRefImpl(getter, setter, isSSR)

  if (__DEV__ && debugOptions && !isSSR) {
    cRef.onTrack = debugOptions.onTrack
    cRef.onTrigger = debugOptions.onTrigger
  }

  return cRef as any
}