export type HTTPString = `http${'' | 's'}://${string}`;
export type WSString = `ws${'' | 's'}://${string}`;
export declare function toWSString(url: HTTPString): WSString;
export declare function toHTTPString(url: WSString): HTTPString;
export declare function assertHTTPString(url: string): asserts url is HTTPString;
export declare function assertWSString(url: string): asserts url is WSString;
export declare function appendPath<T extends HTTPString | WSString>(url: T, toAppend: `/${string}`): T;
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