useCss

• Call useCss('/src/views/<view>/styles.css') inside the view component.
• L5E emits the <link> tag in the response and skips it on other views.
• In production, all view CSS for the request is bundled together for one round-trip.

Calling it more than once

Registering the same path several times in one request — a shared component that renders twice, a layout and a page that both need the file — emits a single <link>. The first call decides where the file lands in the cascade; later calls for the same path are ignored. This holds in dev and in production.

Path convention

The path must be an absolute path from the project root, starting with /src/ — e.g. /src/views/home/styles.css. Relative forms (./styles.css, ../shared/x.css) and bare paths (src/views/... without the leading /) are not supported.

This is because the build-time bundler regex-scans your view files for literal useCss('…') calls before any JS executes — the argument has to be a string the scanner can resolve without knowing the calling file's location.

Planned for a later release: a path helper that gives you typesafe imports and relative paths (useCss(css('./styles.css')) or similar) without losing the static scannability the bundler relies on.