Function add

packages/reactivity/src/collectionHandlers.ts:169–188

(this: SetTypes, value: unknown)

        }
      : {
          add(this: SetTypes, value: unknown) {
            const target = toRaw(this)
            const proto = getProto(target)
            const rawValue = toRaw(value)
            const valueToAdd =
              !shallow && !isShallow(value) && !isReadonly(value)
                ? rawValue
                : value
            const hadKey =
              proto.has.call(target, valueToAdd) ||
              (hasChanged(value, valueToAdd) &&
                proto.has.call(target, value)) ||
              (hasChanged(rawValue, valueToAdd) &&
                proto.has.call(target, rawValue))
            if (!hadKey) {
              target.add(valueToAdd)
              trigger(target, TriggerOpTypes.ADD, valueToAdd, valueToAdd)
            }
            return this
          },
          set(this: MapTypes, key: unknown, value: unknown) {
            if (!shallow && !isShallow(value) && !isReadonly(value)) {
              value = toRaw(value)