26 lines
652 B
Markdown
26 lines
652 B
Markdown
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---
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title: needs()
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---
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```js
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bool pattern.needs(string partName)
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```
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Returns `true` or `false` depending on whether a pattern part is *needed*, based
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on the value of [pattern.settings.only](/reference/settings/only/) and the
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part dependencies listed in the configuration file.
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A part is needed if:
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- it is requested by the user in the `only` setting
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- it is a dependency of a part requested by the user in the `only` setting
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- the `only` setting is not set or is `false`, and the part is not hidden
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<Note>
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You don't typically use this method. Instead, configure part
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dependencies in your [configuration file](/reference/config/).
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</Note>
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