This skill guides you through migrating a JavaScript/TypeScript project from Prettier or Biome to Oxfmt.

Overview

Oxfmt is a high-performance, Prettier-compatible code formatter. Most Prettier options are supported directly.

An automated migration tool is built into oxfmt, supporting both Prettier and Biome as migration sources.

Step 1: Run Automated Migration

First, decide whether the automated tool fits:

Static root config (JSON/YAML, or a JS/TS config that just exports a plain object): use --migrate below.
Dynamic JS/TS config (logic such as environment branches or computed values): --migrate writes only a resolved snapshot of the values — the logic does not survive. Migrate manually instead, porting the logic to oxfmt.config.ts with the option mappings in this guide.
Nested per-directory configs: --migrate only handles the config found from the current directory. Migrate the nested ones manually (see "Nested Config" in Step 2).