Scope oxfmt to TypeScript and JavaScript

[antstanley]

A bare oxfmt . wanted to rewrite 34 files, none of them TS or JS: the Starlight docs prose, the specs, every README, the GitHub workflows, all package.json files, and the commented .oxlintrc.json and config/*.jsonc. That is why the formatter has only ever been invoked as oxfmt packages/*/src — the safe scope lived in people's heads rather than in the config.

ignorePatterns writes it down, grouped by why:

• .changeset/** + **/CHANGELOG.md — owned by changesets. The CLI emits frontmatter with double quotes and rewrites these on every release, so oxfmt flipping them under singleQuote starts a fight the CLI always wins. This actually bit the olive-clouds-repeat changeset.
• **/*.md, **/*.mdx — authored prose. Reflowing hand-written documentation is a content change, not formatting.
• **/*.json, **/*.jsonc — package.json field order plus the deliberately commented .oxlintrc.json and config/*.jsonc deploy files. oxfmt's sortPackageJson behaviour is not wanted here.
• .github/** — workflow YAML, where layout is deliberate.

Build output needs no entry: oxfmt reads .gitignore by default, which already covers dist/, packages/cli/agent/, and node_modules/.

Verified four ways, since the failure mode of an over-broad ignore is a formatter that silently does nothing:

1. oxfmt --check . is clean (118 files matched, down from 185).
2. A deliberately misformatted .ts probe is still caught repo-wide.
3. The same probe is still caught via oxfmt --check packages/*/src.
4. A probe changeset keeps its double quotes through a real write pass, not just --check.

Re-verified after rebasing onto the v0.3.3 release commit, which bumped every package.json and added CHANGELOG entries — both categories are correctly ignored.

No changeset: tooling config only, internal per DEVELOPMENT.md.

Follow-up worth considering: oxfmt . is now safe to run bare, so packages/*/src is no longer load-bearing. A root format script plus a CI check would stop drift accumulating — nothing currently enforces formatting, which is how the earlier 13-file drift built up.

🤖 Generated with Claude Code