/**
 * What a `?css-sheet` import compiles to under `vite build`.
 *
 * - `'url'`: fetch-backed sheet over the emitted `.css` asset.
 * - `'inline'`: css text embedded in the JS chunk, processed by the css
 *   pipeline (`?inline`).
 * - `'inline-raw'`: css text embedded verbatim, skipping the css pipeline
 *   (`?raw`).
 * - `'auto'`: `'inline'` when `build.lib` is set, `'url'` otherwise.
 */
export type CssSheetBuild = 'auto' | 'url' | 'inline' | 'inline-raw';
/**
 * The explicit option first, then `LIT_PLUGIN_CSS_SHEET_BUILD`, then `'auto'`.
 * Shared by `resolveOptions()` and `litCss()`, which skips the full options
 * layer.
 */
export declare const resolveCssSheetBuild: (option: string | undefined, env: Record<string, string>) => CssSheetBuild;
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