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node_modules
dist

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Copyright (c) 2026 Brent Schroeter
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# Attq!
An async tiny task queue (and related utilities), with zero dependencies. Attq
provides a data structure that executes an asynchronous callback sequentially on
a flexible list. It is designed to facilitate in-order client-server message
passing with bells and whistles including batching, throttling, and configurable
retries. **Work in progress.**
## Example
```typescript
import { AsyncTaskQueue } from "attq";
const q = new AsyncTaskQueue<number>(
(nums: number[]) => fetch(`/refine?macrodata=${nums.join(",")}`),
)
// Handler will receive up to 4 items per batch.
.batchSize(4)
// Handler will be called at most once per 100 milliseconds.
.throttleMs(100);
// Add items to the queue.
for (let n = 0; n < 1000; n++) {
q.push(n);
}
await new Promise((resolve) => setTimeout(resolve, 5000));
console.log(q.size()); // Should display >=800 items remaining.
// Stop processing items if any causes an exception.
q.onError(() => {
q.drain();
});
```

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[tools]
node = "24"
[tasks.build]
run = "npx rollup -c"

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{
"name": "attq",
"version": "0.1.0-beta.0",
"description": "Async Tiny Task Queue",
"repository": {
"type": "git",
"url": "https://forge.secondsystemtech.com/brent/attq"
},
"license": "MIT",
"author": "Brent Schroeter (https://brentsch.com)",
"browser": "dist/index.min.js",
"main": "dist/index.js",
"module": "dist/index.mjs",
"types": "dist/index.d.ts",
"scripts": {
"build": "mise run build",
"test": "mise run test"
},
"devDependencies": {
"@rollup/plugin-terser": "^0.4.4",
"@rollup/plugin-typescript": "^12.3.0",
"rollup": "^4.57.1",
"tslib": "^2.8.1",
"typescript": "^5.9.3"
}
}

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import terser from "@rollup/plugin-terser";
import typescript from "@rollup/plugin-typescript";
import pkg from "./package.json" with { type: "json" };
export default {
input: "src/index.ts",
output: [
{
file: pkg.browser,
format: "umd",
name: "attq",
plugins: [terser()],
},
{ file: pkg.main, format: "cjs" },
{ file: pkg.module, format: "es" },
],
plugins: [typescript()],
};

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/**
* Simple queue that executes an asynchronous handler on data in order.
*/
export class AsyncTaskQueue<T> {
private _queue: T[] = [];
private readonly _handler: (item: T) => Promise<unknown>;
private _errorHandler: (err: unknown) => unknown = console.error;
private _batchSize = 1;
private _throttleIntervalMs = 0;
private _processing: boolean = false;
constructor(handler: (items: T[]) => Promise<unknown>) {
this._handler = handler;
}
/**
* Replaces the error handler for this queue. The error handler is called
* whenever the task handler throws.
*
* This method updates the queue in place and returns it, so method calls may
* be chained.
*/
onError(errorHandler: (err: unknown) => unknown): AsyncTaskQueue<T> {
this._errorHandler = errorHandler;
return this;
}
/**
* Sets batch size for this queue. Setting this value greater than 1 allows
* the queue to pass up to n items to the task handler each time it is called.
*
* This method updates the queue in place and returns it, so method calls may
* be chained.
*/
batchSize(batchSize: number): AsyncTaskQueue<T> {
if (batchSize < 1) {
throw new Error("Batch size must be at least 1.");
}
this._batchSize = batchSize;
return this;
}
/**
* Sets throttle interval for this queue. Setting this longer than 0
* milliseconds will cause the queue to call the task handler at most once
* every n milliseconds.
*
* This method updates the queue in place and returns it, so method calls may
* be chained.
*/
throttleMs(intervalMs?: number): AsyncTaskQueue<T> {
if (intervalMs < 0) {
throw new Error("Interval must be zero or more milliseconds.");
}
this._throttleIntervalMs = intervalMs;
return this;
}
/**
* Adds an item to the back of the queue.
*/
push(item: T): void {
this._queue.push(item);
if (!this._processing) {
this._processAll().catch(console.error);
}
}
/**
* Returns all unprocessed items and removes them from the queue.
*/
drain(): T[] {
const items = this._queue;
this._queue = [];
return items;
}
/**
* Returns the number of unprocessed items in the queue.
*/
size(): number {
return this._queue.length;
}
private async _processAll(): void {
// Control loop is very simple: a `while` loop in a single async "thread",
// which runs until the queue is empty and then waits for
// `this._processAll()` to be called again. Because the execution
// environment is single-threaded, the `this._processing` property is a
// sufficient stand-in for a mutex.
if (this._processing) {
throw new Error(
"Assertion error: attq should never process queue concurrently.",
);
}
this._processing = true;
while (this._queue.length > 0) {
const throttleIntervalMs = this._throttleIntervalMs;
const throttleTimeout = throttleIntervalMs
? new Promise((resolve) => setTimeout(resolve, throttleIntervalMs))
: Promise.resolve();
const items = this._queue.splice(0, this._batchSize);
await this._handler(items).catch(this._error_handler);
await throttleTimeout;
}
this._processing = false;
}
}
/**
* Wraps an arbitrary async function with retry logic for exceptions.
*/
export function withRetry<T, U extends Promise>(
fn: (...args: T) => U,
{ attempts = 6, backoffMs = (attempt) => 1000 * 2 ** attempt }: {
attempts: number;
backoffMs(attempt: number): number;
},
): (...args: T) => U {
return async (...args: T) => {
for (let attempt = 0; attempt < attempts - 1; attempt += 1) {
try {
return await fn(...args);
} catch {
const delay = backoffMs(attempt);
await new Promise((resolve) => setTimeout(resolve, delay));
}
}
// Preferably run the final attempt without a try/catch block so that thrown
// exceptions get a clean stack trace.
return await fn(...args);
};
}

19
tsconfig.json Normal file
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@ -0,0 +1,19 @@
{
"compilerOptions": {
"esModuleInterop": true,
"skipLibCheck": true,
"target": "es2022",
"allowJs": false,
"resolveJsonModule": true,
"moduleDetection": "force",
"isolatedModules": true,
"verbatimModuleSyntax": true,
"strict": true,
"noUncheckedIndexedAccess": true,
"noEmit": true,
"declaration": true,
"declarationDir": "dist",
"module": "preserve",
"lib": ["es2022"]
}
}