feat(oxfmt): Support .oxfmtrc.json(c) config file

[leaysgur]

Fixes #13611

• Support config file with JSON(C) format
• Automatically find the nearest one from cwd
  • Do not merge, just use the first one
  • Search only .oxfmtrc.json(not .jsonc)
• Use -c or --config to specify path

Example .oxfmtrc.json:

{
  "indentStyle": "space",
  "indentWidth": 2,
  "lineWidth": 80,
  "lineEnding": "lf",
  "quoteStyle": "single",
  "jsxQuoteStyle": "double",
  "quoteProperties": "as-needed",
  "trailingCommas": "all",
  "semicolons": "always",
  "arrowParentheses": "always",
  "bracketSpacing": true,
  "bracketSameLine": false,
  "attributePosition": "auto",
  "expand": "auto",
  "experimentalOperatorPosition": "before",
  "experimentalSortImports": {
    "partitionByNewline": false,
    "partitionByComment": false,
    "sortSideEffects": false,
    "order": "asc",
    "ignoreCase": true
  }
}

We may provide tools like oxfmt-migrate to convert .prettierrc.

[leaysgur]

• fix(oxc_formatter): Fix arrow_parentheses: 'avoid' > 'as-needed' #14462
• feat(oxfmt): Provide JSON schema for .oxfmtrc.json #14399
• feat(oxfmt): Support .oxfmtrc.json(c) config file #14398 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #14398 will not alter performance

_{Comparing 10-07-feat_oxfmt_support_oxfmt.json (51ddfa8) with main (78261d6)}

Summary

✅ 37 untouched

[Copilot]

Pull Request Overview

This PR adds support for .oxfmtrc.json(c) configuration files to the oxfmt formatter tool. The implementation includes automatic discovery of config files from the current working directory upwards, support for JSONC format with comments, and the ability to specify a custom config path via the -c/--config flag.

Key changes:

• Creates a new Oxfmtrc struct to handle JSON-based configuration parsing and validation
• Implements automatic config file discovery starting from the current directory and searching upwards
• Adds CLI support for specifying custom config file paths

Reviewed Changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/oxc_formatter/src/service/oxfmtrc.rs	New module implementing JSON config file parsing with support for all formatting options
crates/oxc_formatter/src/service/mod.rs	Exports the new oxfmtrc module
crates/oxc_formatter/src/lib.rs	Re-exports the Oxfmtrc struct for external use
crates/oxc_formatter/Cargo.toml	Adds dependencies for JSON parsing and comment stripping
apps/oxfmt/src/format.rs	Implements config file discovery logic and integrates config loading into the formatting pipeline
apps/oxfmt/src/command.rs	Adds BasicOptions struct with config file path argument
apps/oxfmt/src/service.rs	Updates FormatService to accept and use FormatOptions from config
apps/oxfmt/tests/mod.rs	Adds comprehensive tests for config file auto-discovery and explicit specification
Test fixtures	Various JSON/JSONC config files and test data for validation

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[leaysgur]

@Sysix If you have time, please check that everything needed for LS is ready. 🙏🏻

[Sysix]

looks good for the server 👍 thank you

[Dunqing]

Looks good! There is a tiny thing that can be simplified a little.

[graphite-app]

Merge activity

• Oct 9, 6:22 AM UTC: Dunqing added this pull request to the Graphite merge queue.
• Oct 9, 6:28 AM UTC: Merged by the Graphite merge queue.