Add support for a pattern or configuration to ignore specific files in the app directory, allowing developers to include auxiliary files, such as styles or utilities, without them being treated as routes.

Description

Currently, the app directory in expo-router automatically treats all files as routes. This makes it difficult to include non-route files like shared styles, constants, or utility functions within the same directory structure. For example, a _styles.tsx file would be treated as a route, which is not the intended behavior.

By adding a pattern or configuration to ignore files (e.g., files starting with an underscore _), developers can keep related files together while maintaining a clean route structure.

Proposed Solution

Introduce a convention where files prefixed with _ (e.g., _styles.tsx) are ignored when generating routes.

Alternatively, provide an option in the configuration file (e.g., expo-router.config.js) to specify files or patterns to ignore.

Example

With the proposed feature, the following structure:

arduino

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app/

home/

index.tsx

_styles.tsx

about.tsx

_utils.ts