import { PageTheme } from "@backstage/theme";
import { ThemeConfigPageTheme } from "../types";
/**
 * Creates a page theme from a page theme configuration (app-config.yaml).
 *
 * This allows the user to specificy a custom header with:
 *
 *  * `backgroundColor` or `colors` like `'#ff0000'`, `['#ff0000']` or `['#ff0000', '#00ff00', '#0000ff']`.
 *
 *    More then one color will create a gradient from left to right.
 *
 *  * a `shape` like `round`, `wave`, `wave2`, or `none`.
 *
 *  * or an `backgroundImage` that supports different types of images references:
 *
 *    1. CSS urls like `data:image/svg+xml,...` or `url(data:image/svg+xml,...)`
 *    2. Absolute or relative URLs starting with `http://`, `https://` or `/`
 *    3. Inline <svg>...</svg> images will be transformed to `url(data:image/svg+xml,<svg>...</svg>)`
 *
 *  * `fontColor` like `'#ffffff'` or `'#000000'`
 */
export declare const createPageTheme: (pageThemeConfig: ThemeConfigPageTheme) => PageTheme;