Tailwind 4

Description

TailwindCSS scans code (HTML, JavaScript, components, templates, and other configured formats), for class names. It generates styles from the scanned classes, and writes them to a static CSS file.

Config

Global CSS variables are defined in app.config.ts and main.css.

app.config.ts

Customizations in app.config.ts are reactive, runtime updatable, support HMR, and can be invoked as TW classes:

<UButton class="text-(--ui-primary)" label="Some String" />

SECURITY: app.config.ts vars are exposed to the client bundle, so should not contain sensitive data.

main.css

Theme vars defined in main.css are base styling tokens comprizing the app's visual foundation and can also be invoked as TW classes:

@theme Directive

Static

Use the static keyword for apps whose theme does not change between builds.

OPTIMIZATION:static tells TW to evaluate theme vars at build time,instead of runtime. This causes the build to use only optimized CSS with no TS computation, thus avoiding dynamic runtime processing.

@theme static {
  --color-primary: 'blue';
}