What's Changed

Key Features

This release includes two major improvements to textlint's severity system and configuration handling:

1. New info Severity Level (PR #1610)

We've implemented proper support for the info severity level, which provides more flexible linting for informational messages that are less critical than warnings.

Background: Previously, info had the same value as none (0), causing confusion. Now info has its own distinct value (3) and is properly supported across all formatters.

Use Case: This is particularly useful for AI-assisted writing rules, such as those in textlint-ja/textlint-rule-preset-ai-writing, which provides LLM-oriented rules for guidelines. These rules can be somewhat broad and may produce false positives if used as errors, but when reported as info, they provide more flexible feedback for AI agents and human writers.

Severity Levels:

• none: 0 - Disabled
• warning: 1 - Warning (yellow)
• error: 2 - Error (red)
• info: 3 - Informational (green)

Example Usage:

{
  "rules": {
    "my-rule": {
      "severity": "info"  // Now properly displays as green "info" 
    }
  }
}

2. Fixed Preset Severity Preservation (PR #1607)

Fixed an issue where preset-defined severity settings were lost when users provided partial rule configuration in their .textlintrc file.

Problem: When using a preset that defined severity levels for rules, those settings were completely lost if users added any custom options for those rules.

Solution: Implemented a clear priority system where user configuration completely overrides preset configuration when provided (no merging), making behavior predictable and consistent.

Related Issues: Fixes #1608, #1606

Features

• feat: implement info severity level by @azu in #1610

Bug Fixes

• fix: preserve preset severity settings when user provides true config by @azu in #1607

Documentation

• chore: fix typos by @noritaka1166 in #1604

Testing

• test(config-loader): add user config is true case by @azu in #1609

CI

• fix: skip deploy-pr-preview for external repository PRs by @devin-ai-integration in #1605

Dependency Updates

• chore: update npm-run-all2 from v5 to v8 by @noritaka1166 in #1593
• chore(deps): update patch updates (patch) by @renovate in #1595
• chore(deps): update eslint to ^8.34.1 (patch) by @renovate in #1597
• chore: update lint-staged from v13 to v16 by @noritaka1166 in #1596
• fix(deps): update dependency zod to ^3.25.67 by @renovate in #1598
• chore: update globals from v15 to v16 by @noritaka1166 in #1599
• chore(deps): update dependency vitest to ^3.2.4 by @renovate in #1600
• chore(deps): update dependency @types/lodash to ^4.17.18 by @renovate in #1602
• fix(deps): update dependency @modelcontextprotocol/sdk to ^1.13.0 by @renovate in #1603
• chore: update eslint-config-prettier from v9 to v10 by @noritaka1166 in #1601

Other Changes

• Update 2025-06-22-textlint-15.md by @azu in #1592
• Update 2025-06-22-textlint-15.md by @azu in #1594

New Contributors

• @devin-ai-integration made their first contribution in #1605

Full Changelog: v15.0.1...v15.1.0