:sig
bool component_exists(String name)

:see
>ob
component
component_render
component_resolve
1_COMPONENT

:content
Checks whether a component file can be resolved from the current page context.

Resolution uses the same host resolver as `component_resolve()`: candidate bases include absolute targets, the entry unit directory, the current unit directory, and the site root; each base tries exact, `.uce`, `components/name`, and `components/name.uce` forms.

If `name` contains a colon, only the file portion is used for existence checks.

This is useful when a page wants to render an optional component if it is present without hard-failing when it is missing.

## Related Concepts

- PHP: `function_exists()`, `class_exists()`, or file-existence checks before including a partial
- JavaScript / Node.js: module existence checks, dynamic import guards, or registry lookups for named components