: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.

:example
print(component_exists("examples/sample_unit") ? "exists" : "not found", " / ", component_exists("no_such_component") ? "exists" : "not found", "\n");