export declare const playtestQueryParam: string;
/** Must align to Devvit CLI. */
export declare const playtestURI: string;
/**
 * The playtest application name (slug) to filter on or empty (unfiltered).
 * undefined if playtest is disabled.
 */
export type PlaytestFilter = string;
/**
 * @arg app App name (slug). Do not derive from `location`.
 * @ret true if the current URL supports playtests.
 */
export declare function isPlaytest(app: string): boolean;
export declare function getPlaytestFilter(): PlaytestFilter | undefined;
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