export interface OAuthWatcherOptions {
    apiOrigin: string | (() => string | Promise<string>);
    offscreenUrl: string | (() => string | Promise<string>);
    offscreenReasons: chrome.offscreen.Reason[];
    offscreenJustification: string;
}
export declare function matchOAuthCallback(url: string, apiOrigin: string): string | null;
/** Whether this is one of our post-payment return pages. Matched by path only —
 *  the outcome lives in the URL fragment, which we neither need nor can rely on
 *  seeing here. */
export declare function isCheckoutReturn(url: string, apiOrigin: string): boolean;
export declare function installOAuthWatcher(opts: OAuthWatcherOptions): void;
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