useBiomeIgnoreFolder

JSON (and super languages)

Summary

Rule available since: v2.2.0
Diagnostic Category: lint/suspicious/useBiomeIgnoreFolder
This rule is recommended, which means 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

Promotes the correct usage for ignoring folders in the configuration file.

Starting Biome v2.2, ignoring folders doesn’t require the use of the trailing /**. When using the pattern /**, you tell Biome to ignore all files inside a folder, but the folder is still crawled. This pattern can lead to poor performance, especially if the folder contains many files.

If the intention is to ignore specific files inside a folder, the trailing pattern /** shouldn’t be used.

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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}