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92 lines
2.3 KiB
Markdown
92 lines
2.3 KiB
Markdown
---
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slug: /docs/cli/rules/no-unused-components
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---
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# no-unused-components
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Ensures that every component specified in your API description is used at least once.
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In this context, "used" means that a component defined in the `components` object is referenced elsewhere in the API document with `$ref`.
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| OAS | Compatibility |
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| --- | ------------- |
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| 2.0 | ❌ |
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| 3.0 | ✅ |
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| 3.1 | ✅ |
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```mermaid
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flowchart TD
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Root ==> Components
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style Components fill:#codaf9,stroke:#0044d4,stroke-width:5px
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```
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## API design principles
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This rule is intended to help security-focused enterprises prevent data leaks. Components can leak schemas, parameters, and other properties that may be unused in the exposed APIs, but used internally elsewhere.
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However, your API document may contain common components used in other APIs.
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If that describes your use-case, turn this rule off.
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## Configuration
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| Option | Type | Description |
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| -------- | ------ | ----------------------------------------------------------------------------------------- |
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| severity | string | Possible values: `off`, `warn`, `error`. Default `warn` (in `recommended` configuration). |
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An example configuration:
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```yaml
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rules:
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no-unused-components: error
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```
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## Examples
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Given this configuration:
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```yaml
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rules:
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no-unused-components: error
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```
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Example of **incorrect** components:
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```yaml
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openapi: 3.1.0
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paths:
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/customers:
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$ref: '#/components/pathItems/customers'
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components:
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pathItems:
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customers:
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# ...
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dealers:
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# ...
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```
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> The dealers `PathItem` is an unused component.
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Example of **correct** components:
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```yaml
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openapi: 3.1.0
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paths:
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/customers:
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$ref: '#/components/pathItems/customers'
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components:
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pathItems:
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customers:
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# ...
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```
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## Relates rules
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- [no-undefined-refs](./no-unresolved-refs.md)
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## Resources
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- The Redocly CLI `bundle` command supports an option called `--remove-unused-components`. Use it to automatically clean up any unused components from your OpenAPI document while bundling it.
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- [Rule source](https://github.com/Redocly/redocly-cli/blob/main/packages/core/src/rules/oas3/no-unused-components.ts)
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- [Components docs](https://redocly.com/docs/openapi-visual-reference/components/)
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