{"version":3,"file":"index.mjs","names":[],"sources":["../../../src/utils/async/index.ts"],"sourcesContent":["/** 统一同步返回值与 PromiseLike 返回值的内部回调签名 */\ntype AsyncCallback<Arguments extends unknown[], Result> = (...arguments_: Arguments) => Result | PromiseLike<Result>;\n\n/** 记录同一防抖批次中每个调用方独立的 Promise 结算函数 */\ninterface PromiseWaiter<Result> {\n\t/**\n\t * 使用批次失败原因拒绝当前调用方。\n\t * @param reason - `cancel` 提供的原因或共享回调抛出的原始错误。\n\t */\n\treject: (reason?: unknown) => void;\n\t/**\n\t * 使用共享回调结果完成当前调用方，并采用传入 PromiseLike 的最终状态。\n\t * @param value - 当前防抖批次唯一一次回调执行产生的共享结果。\n\t */\n\tresolve: (value: Result | PromiseLike<Result>) => void;\n}\n\n// 浏览器和 Node.js 的计时器普遍以有符号 32 位整数保存延迟；更大的值可能被\n// 静默截断为约 1 ms，因此公共 API 在进入平台计时器前统一拒绝它。\nconst maximumTimerDelay = 2_147_483_647;\n\n/** Promise 感知的防抖函数 */\nexport interface DebouncedFunction<Arguments extends unknown[], Result> {\n\t/**\n\t * 调度一次调用；同一等待窗口内的调用共享最后一组参数对应的结果。\n\t * @param arguments_ - 传给原始回调的参数；后续调用会覆盖尚未执行批次保存的参数。\n\t * @returns 当前批次的独立 Promise，最终与共享回调结果保持相同状态。\n\t */\n\t(...arguments_: Arguments): Promise<Result>;\n\t/**\n\t * 取消尚未执行的批次，并拒绝该批次的所有 Promise。\n\t * @param reason - 可选拒绝原因；省略时使用内部取消错误。\n\t */\n\tcancel: (reason?: unknown) => void;\n\t/**\n\t * 立即执行待处理批次，不创建第二次回调执行。\n\t * @returns 待处理批次的共享执行 Promise；没有批次时返回 `undefined`。\n\t */\n\tflush: () => Promise<Result> | undefined;\n\t/** @returns 当前存在尚未开始的批次时返回 `true`；正在执行但没有等待批次时返回 `false`。 */\n\tpending: () => boolean;\n}\n\n/**\n * 校验宿主计时器可以稳定表示的延迟。\n *\n * @param milliseconds - 待校验的毫秒数\n * @param name - 用于错误消息的参数名称\n * @returns 原始延迟值，便于调用方在校验后直接使用。\n * @throws `RangeError` 当值非有限、为负数或超过 32 位计时器上限。\n */\nconst assertDelay = (milliseconds: number, name = \"milliseconds\"): number => {\n\tif (!Number.isFinite(milliseconds) || milliseconds < 0 || milliseconds > maximumTimerDelay) {\n\t\tthrow new RangeError(`\\`${name}\\` must be a finite number between 0 and ${maximumTimerDelay}.`);\n\t}\n\treturn milliseconds;\n};\n\n/**\n * 创建 Promise 感知的防抖函数。\n *\n * @remarks 同一窗口内的所有调用都会等待最后一组参数对应的执行结果；回调错误会原样\n * 拒绝该批次的全部调用，不会留下永久 pending 的 Promise。\n * @param callback - 同步或异步回调\n * @param delayMs - 0 至 2,147,483,647 的有限等待时间，默认 300 毫秒。\n * @returns 具有取消、立即执行和状态方法的防抖函数\n * @throws `RangeError` 当延迟不在平台计时器支持范围内。\n */\nexport function debounce<Arguments extends unknown[], Result>(\n\tcallback: AsyncCallback<Arguments, Result>,\n\tdelayMs = 300\n): DebouncedFunction<Arguments, Awaited<Result>> {\n\tconst delay = assertDelay(delayMs, \"delayMs\");\n\tlet timer: ReturnType<typeof setTimeout> | undefined;\n\tlet latestArguments: Arguments | undefined;\n\tlet waiters: PromiseWaiter<Awaited<Result>>[] = [];\n\n\t/**\n\t * 执行并结算当前防抖批次。\n\t *\n\t * @returns 最后一组参数对应的回调结果\n\t * @throws 没有待处理批次时抛出 `Error`；回调错误会原样传播给批次中的全部调用方。\n\t */\n\tconst execute = async (): Promise<Awaited<Result>> => {\n\t\tconst arguments_ = latestArguments;\n\t\tif (arguments_ === undefined) {\n\t\t\tthrow new Error(\"There is no pending debounced invocation.\");\n\t\t}\n\t\tlatestArguments = undefined;\n\t\ttimer = undefined;\n\t\tconst currentWaiters = waiters;\n\t\twaiters = [];\n\t\ttry {\n\t\t\tconst result = await callback(...arguments_);\n\t\t\tcurrentWaiters.forEach((waiter) => {\n\t\t\t\twaiter.resolve(result);\n\t\t\t});\n\t\t\treturn result;\n\t\t} catch (error) {\n\t\t\tcurrentWaiters.forEach((waiter) => {\n\t\t\t\twaiter.reject(error);\n\t\t\t});\n\t\t\tthrow error;\n\t\t}\n\t};\n\n\t/**\n\t * 更新批次参数并返回当前调用方专属的等待 Promise。\n\t *\n\t * @param arguments_ - 本次调用参数；同批次中只有最后一组参数会执行。\n\t * @returns 与当前批次共享结果、但可独立结算的 Promise\n\t */\n\tconst debounced = (...arguments_: Arguments) => {\n\t\tlatestArguments = arguments_;\n\t\tif (timer !== undefined) clearTimeout(timer);\n\t\ttimer = setTimeout(() => {\n\t\t\texecute().catch(() => undefined);\n\t\t}, delay);\n\t\treturn new Promise<Awaited<Result>>((resolve, reject) => {\n\t\t\twaiters.push({ reject, resolve });\n\t\t});\n\t};\n\n\tdebounced.cancel = (reason?: unknown) => {\n\t\tif (timer !== undefined) clearTimeout(timer);\n\t\ttimer = undefined;\n\t\tlatestArguments = undefined;\n\t\tconst error = reason ?? 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