@canonical/biome-config-svelte

This package extends @canonical/biome-config with Svelte-specific overrides for Biome.

Use this in Svelte projects so that .svelte files get appropriate lint/format settings (e.g. relaxed rules until Biome’s Svelte support improves).

Important note

Watch for future Biome releases with improved Svelte support and reconsider these rules when appropriate. See Biome issue #7928 (almost fixed 14/15 tasks).

Install

1. Install Biome: bun add -d @biomejs/biome
2. Install this config: bun add -d @canonical/biome-config-svelte

Consume

Create or update biome.json in the root of your project and extend this configuration (you do not need to extend @canonical/biome-config separately).

{
  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
  "extends": ["@canonical/biome-config-svelte"],
  "files": {
    "includes": ["src", "*.config.ts", "*.config.js"]
  }
}

Run biome commands as usual. You get the base Canonical Biome config plus Svelte overrides.

Svelte overrides

This config adds an override for **/*.svelte that:

• Turns off certain style/correctness rules that are not yet reliable for Svelte (see Biome issue #7928).
• Enables html.formatter.indentScriptAndStyle for .svelte files.

When Biome’s Svelte support improves, these relaxations may be reduced or removed.