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The MIT License (MIT)
Copyright (c) 2021 typicode
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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# Steno [![](http://img.shields.io/npm/dm/steno.svg?style=flat)](https://www.npmjs.org/package/steno) [![Node.js CI](https://github.com/typicode/steno/actions/workflows/node.js.yml/badge.svg)](https://github.com/typicode/steno/actions/workflows/node.js.yml)
> Specialized fast async file writer
**Steno** makes writing to the same file often/concurrently fast and safe.
Used in [lowdb](https://github.com/typicode/lowdb).
_https://en.wikipedia.org/wiki/Stenotype_
## Features
- ⚡ Fast (see benchmark)
- 🐦 Lightweight (~6kb)
- 👍 ⚛️ Safe: No partial writes (writes are atomic)
- 👍 🏁 Safe: No race conditions (writes are ordered even if they're async)
## Usage
```javascript
import { Writer } from 'steno'
// Create a singleton writer
const file = new Writer('file.txt')
// Use it in the rest of your code
async function save() {
await file.write('some data')
}
```
## Benchmark
`npm run benchmark` (see `src/benchmark.ts`)
```
Write 1KB data to the same file x 1000
fs : 62ms
steno : 1ms
Write 1MB data to the same file x 1000
fs : 2300ms
steno : 5ms
```
_Steno uses a smart queue and avoids unnecessary writes._
## License
MIT - [Typicode](https://github.com/typicode)

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/// <reference types="node" resolution-mode="require"/>
/// <reference types="node" resolution-mode="require"/>
import { PathLike } from 'node:fs';
import { writeFile } from 'node:fs/promises';
type Data = Parameters<typeof writeFile>[1];
export declare class Writer {
#private;
constructor(filename: PathLike);
write(data: Data): Promise<void>;
}
export {};

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import { rename, writeFile } from 'node:fs/promises';
import { basename, dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
// Returns a temporary file
// Example: for /some/file will return /some/.file.tmp
function getTempFilename(file) {
const f = file instanceof URL ? fileURLToPath(file) : file.toString();
return join(dirname(f), `.${basename(f)}.tmp`);
}
// Retries an asynchronous operation with a delay between retries and a maximum retry count
async function retryAsyncOperation(fn, maxRetries, delayMs) {
for (let i = 0; i < maxRetries; i++) {
try {
return await fn();
}
catch (error) {
if (i < maxRetries - 1) {
await new Promise((resolve) => setTimeout(resolve, delayMs));
}
else {
throw error; // Rethrow the error if max retries reached
}
}
}
}
export class Writer {
#filename;
#tempFilename;
#locked = false;
#prev = null;
#next = null;
#nextPromise = null;
#nextData = null;
// File is locked, add data for later
#add(data) {
// Only keep most recent data
this.#nextData = data;
// Create a singleton promise to resolve all next promises once next data is written
this.#nextPromise ||= new Promise((resolve, reject) => {
this.#next = [resolve, reject];
});
// Return a promise that will resolve at the same time as next promise
return new Promise((resolve, reject) => {
this.#nextPromise?.then(resolve).catch(reject);
});
}
// File isn't locked, write data
async #write(data) {
// Lock file
this.#locked = true;
try {
// Atomic write
await writeFile(this.#tempFilename, data, 'utf-8');
await retryAsyncOperation(async () => {
await rename(this.#tempFilename, this.#filename);
}, 10, 100);
// Call resolve
this.#prev?.[0]();
}
catch (err) {
// Call reject
if (err instanceof Error) {
this.#prev?.[1](err);
}
throw err;
}
finally {
// Unlock file
this.#locked = false;
this.#prev = this.#next;
this.#next = this.#nextPromise = null;
if (this.#nextData !== null) {
const nextData = this.#nextData;
this.#nextData = null;
await this.write(nextData);
}
}
}
constructor(filename) {
this.#filename = filename;
this.#tempFilename = getTempFilename(filename);
}
async write(data) {
return this.#locked ? this.#add(data) : this.#write(data);
}
}

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{
"name": "steno",
"version": "4.0.2",
"description": "Specialized fast async file writer",
"keywords": [
"fs",
"file",
"write",
"writer",
"asynchronous",
"fast",
"race",
"condition",
"atomic",
"writing",
"safe"
],
"homepage": "https://github.com/typicode/steno",
"bugs": {
"url": "https://github.com/typicode/steno/issues"
},
"repository": {
"type": "git",
"url": "git+https://github.com/typicode/steno.git"
},
"funding": "https://github.com/sponsors/typicode",
"license": "MIT",
"author": "Typicode <typicode@gmail.com>",
"type": "module",
"exports": "./lib/index.js",
"types": "lib/index.d.ts",
"files": [
"lib/index.js",
"lib/index.d.ts"
],
"scripts": {
"test": "node --import tsx/esm --test src/test.ts",
"build": "del-cli lib && tsc",
"lint": "eslint src --ext .ts --ignore-path .gitignore",
"prepare": "husky install",
"prepublishOnly": "npm run build",
"postversion": "git push && git push --tags && npm publish",
"benchmark": "npm run build && node lib/benchmark.js",
"commit": "commit"
},
"devDependencies": {
"@commitlint/cli": "^17.7.2",
"@commitlint/config-conventional": "^17.7.0",
"@commitlint/prompt-cli": "^17.7.2",
"@sindresorhus/tsconfig": "^5.0.0",
"@types/async-retry": "^1.4.8",
"@types/node": "^20.8.3",
"@typicode/eslint-config": "^1.2.0",
"del-cli": "^5.1.0",
"husky": "^8.0.3",
"tsx": "^4.7.0",
"typescript": "^5.2.2"
},
"engines": {
"node": ">=18"
}
}