Add Biome pre-commit hook

[subhajitlucky]

Summary

• add biome.json with shared formatting defaults for web assets
• use the standard biomejs/pre-commit hook for CSS, JS, JSON, and related files
• format the existing Biome-covered web assets so the hook can run cleanly
• keep existing YAML Prettier/YAML lint hooks in place

Verification

• npx --yes @biomejs/biome@2.3.8 check --write --files-ignore-unknown=true .
• parsed .pre-commit-config.yaml with PyYAML
• git diff --check
• git diff --check HEAD~1..HEAD

Fixes #120

[deepsource-io]

DeepSource Code Review

We reviewed changes in b594820...43e0211 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Secrets		May 13, 2026 5:42a.m.	Review ↗
Python		May 13, 2026 5:42a.m.	Review ↗
JavaScript		May 13, 2026 5:42a.m.	Review ↗

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[gemini-code-assist]

Code Review

This pull request integrates Biome into the project's pre-commit workflow and adds a biome.json configuration file for formatting and linting. Feedback was provided to correct the biome.json structure by using the ignore field instead of unsupported negative patterns in includes. Additionally, it was suggested to expand the file regex in the pre-commit configuration to cover a broader range of supported web assets like TypeScript and JSX.

[gemini-code-assist]

Biome uses the singular include key instead of includes. Furthermore, Biome does not support negative patterns (starting with !) within the include array. To exclude specific files or directories, you should use the ignore field. Since include defaults to all files in the project, you can simply provide the ignore list to achieve the desired filtering.

    "ignore": [
      "docs/bootstrap",
      "docs/featured.json",
      "docs/manifest.json",
      "docs/users.json"
    ]

[gemini-code-assist]

The current regex only matches .css, .js, and .json files. Biome supports a wider range of web-related extensions including TypeScript (.ts, .tsx), JSX (.jsx), and various module formats (.mjs, .cjs). Consider expanding the regex to ensure these files are also processed if they exist in the project.

        files: \.(css|js|jsonc?|jsx?|tsx?|m[jt]s|c[jt]s)$

[Copilot]

Pull request overview

This PR introduces Biome as a formatter/linter for web assets in the repository and wires it into the existing pre-commit setup, while keeping the current YAML formatting/linting hooks intact.

Changes:

• Added a root biome.json configuration to define shared formatting defaults and enable Biome’s recommended lint rules.
• Added a local pre-commit hook to run biome check --write on staged CSS/JS/JSON files (with Biome pinned as a Node dependency).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

File	Description
biome.json	Adds Biome configuration for formatting defaults and recommended linting.
.pre-commit-config.yaml	Adds a local Node-based Biome hook for CSS/JS/JSON while retaining existing YAML Prettier/yamllint hooks.

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[subhajitlucky]

Follow-up pushed in 43e0211:

• expanded the Biome pre-commit file matcher to include HTML, so layouts/layout.html is covered alongside JS/TS/JSON/CSS assets.
• verified Biome 2.3.8 accepts the current files.includes force-ignore config. The bundled 2.3.8 schema does not expose a files.ignore property, so I left that structure unchanged rather than introducing an invalid config key.

Verification:

• npx --yes @biomejs/biome@2.3.8 check biome.json layouts/layout.html --diagnostic-level=info
• npx --yes prettier@3.8.3 --check .pre-commit-config.yaml
• git diff --check