Function clear

packages/reactivity/src/collectionHandlers.ts:232–252

(this: IterableCollections)

            return result
          },
          clear(this: IterableCollections) {
            const target = toRaw(this)
            const hadItems = target.size !== 0
            const oldTarget = __DEV__
              ? isMap(target)
                ? new Map(target)
                : new Set(target)
              : undefined
            // forward the operation before queueing reactions
            const result = target.clear()
            if (hadItems) {
              trigger(
                target,
                TriggerOpTypes.CLEAR,
                undefined,
                undefined,
                oldTarget,
              )
            }
            return result
          },
        },
  )