Function createReadonlyMethod

packages/reactivity/src/collectionHandlers.ts:77–92

(type: TriggerOpTypes)

}

function createReadonlyMethod(type: TriggerOpTypes): Function {
  return function (this: CollectionTypes, ...args: unknown[]) {
    if (__DEV__) {
      const key = args[0] ? `on key "${args[0]}" ` : ``
      warn(
        `${capitalize(type)} operation ${key}failed: target is readonly.`,
        toRaw(this),
      )
    }
    return type === TriggerOpTypes.DELETE
      ? false
      : type === TriggerOpTypes.CLEAR
        ? undefined
        : this
  }
}

type Instrumentations = Record<string | symbol, Function | number>