useBiomeIgnoreFolder (JSON)

Language JSON (and super languages)

Summary

Rule available since: v2.2.0
Diagnostic Category: lint/suspicious/useBiomeIgnoreFolder
This rule is recommended, meaning it is enabled by default.
This rule has a safe fix.
The default severity of this rule is warning.

How to configure

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{
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  "linter": {
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    "rules": {
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      "suspicious": {
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        "useBiomeIgnoreFolder": "error"
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      }
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    }
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  }
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}

Description

Prefer folder exclusions that prevent Biome from scanning the folder.

A negated pattern such as !dist/** excludes files inside dist, but Biome still enters the directory to discover them. Use !dist to exclude the folder itself and avoid unnecessary filesystem traversal. The same applies to nested patterns such as !**/dist.

Examples

Invalid

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{
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    "files": {
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        "includes": ["**", "!dist/**", "!**/dist/**"]
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    }
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}

Valid

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{
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    "files": {
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        "includes": ["**", "!dist", "!**/dist"]
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    }
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}