/** Whether a name carries the given extension. */
export declare function hasExtension(name: string | undefined, extension: string): boolean;
/** Name with the given extension appended. Idempotent. */
export declare function withExtension(name: string, extension: string): string;
/** Inverse of `withExtension`: the name without the given extension. */
export declare function withoutExtension(name: string, extension: string): string;