fast-format

Formats code with oxfmt as part of your lint pass. No separate formatter step needed.

Rule details Layout

The rule runs oxfmt on each file during linting. When the file doesn’t match the formatted output, it reports a minimal set of edits (insert, delete, replace) and can apply them with --fix.

Fast enough for every save

oxfmt is a Rust-based formatter, usually much faster than Prettier. Wiring it into ESLint keeps formatting in the same pass as the rest of your lint rules.

How it works

1. The rule reads your file and identifies its language (TS, JS, TSX, JSX).
2. It runs oxfmt on the source.
3. It computes a minimal diff between original and formatted output.
4. ESLint applies those edits when you run with --fix.

An LRU cache (default capacity: 32 files) skips unchanged files so repeated runs stay fast.

Features

Rust-powered

oxfmt runs in native code. Formatting is fast.

LRU caching

Unchanged files get skipped via an internal cache keyed on filename + content.

Auto-fix

Works with eslint --fix and bun run lint:fix.

Unified tooling

No separate formatter step. Formatting runs alongside your other lint rules.

Usage

Command line

Fixing issues

Run the fix command to format your project:

bun run lint:fix
eslint --fix src/

Configuration

ESLint setup

import ceaseNonsense from "eslint-plugin-cease-nonsense";

export default [
  {
    plugins: {
      "cease-nonsense": ceaseNonsense,
    },
    rules: {
      "cease-nonsense/fast-format": "error",
    },
  },
];

Message types

Type	Meaning	Example
INSERT	Missing whitespace or punctuation	Insert " " at position 42
DELETE	Extra or incorrect characters	Delete ";" at position 10
REPLACE	Swapping styles (e.g., quotes)	Replace 'hello' with "hello"

Supported extensions

The rule processes .js, .jsx, .ts, .tsx, .mjs, and .cjs files. Everything else gets skipped.

Related rules

no-commented-code Clean up dead comment blocks

naming-convention Enforce naming standards

Further reading

oxfmt documentation Official guide to the oxc formatter