/**
 * Theme → CSS compilation.
 *
 * Shared between the serializer ([app.ts]) and the renderer ([renderer/theme.ts]).
 * Protocol 0.3 (upstream PrefectHQ/prefab PR #431) folds the theme into the
 * wire `css` array instead of shipping a structured `theme` object, so the
 * builder compiles `{ light, dark }` variable maps into a CSS string here.
 *
 * Selector convention: light variables target `:root`; dark variables target
 * BOTH `.dark` (upstream's class convention) and `[data-theme="dark"]`
 * (this port's attribute convention) so the emitted CSS renders correctly
 * under either renderer.
 */
export interface ThemeVars {
    light?: Record<string, string>;
    dark?: Record<string, string>;
}
/** Strip characters that could break out of a CSS property name. */
export declare function sanitizeCssIdent(key: string): string;
/** Strip characters/patterns that could escape CSS value context. */
export declare function sanitizeCssValue(value: string): string;
/**
 * Compile a `{ light, dark }` theme into a single CSS string.
 *
 * - `light` vars target `:root`
 * - `dark` vars target `.dark, [data-theme="dark"]` plus a
 *   `prefers-color-scheme: dark` block (unless an explicit light scope opts out)
 *
 * Returns an empty string when the theme has no variables.
 */
export declare function compileThemeCss(theme: ThemeVars | undefined): string;
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