typicode/steno

Super fast async file writer with atomic write

Steno makes writing concurrently fast and safe.

Battle-tested in lowdb.

• ⚡ Fast (see benchmark)
• 🐦 Lightweight (~6kb)
• 🩵 Written in TypeScript
• 🖊️ Writes are atomic (no partial writes)
• 🏎️ Writes are ordered even if they're async (no race conditions)
• ♻️ Automatic retry

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')
}

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.

https://en.wikipedia.org/wiki/Stenotype

MIT - Typicode