/**
 * Parses an absolute preview URL string. Accepts `https:` on any host, and `http:`
 * only on `localhost` hosts, which is how previews are served in the local dev
 * environment. Returns `null` on parse errors and for any other scheme/host pair.
 *
 * @param uri - Absolute URL string to parse.
 * @returns A `URL` when the string is a valid preview URL; otherwise `null`.
 *
 * @example
 * ```ts
 * parsePreviewUrl('https://slug--branch.preview.redocly.app');
 * // URL { href: 'https://slug--branch.preview.redocly.app/' }
 *
 * parsePreviewUrl('http://slug--branch.preview.localhost');
 * // URL { href: 'http://slug--branch.preview.localhost/' }
 *
 * parsePreviewUrl('http://slug--branch.preview.redocly.app');
 * // null
 * ```
 */
export declare function parsePreviewUrl(uri: string): URL | null;
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