export declare const stripTrailingSlashes: (url: string) => string;
export declare function assertContainerId(containerId: string): string;
export declare function assertDataLayerName(name: string): string;
/**
 * Validates and canonicalizes a container base URL for use as a script `src` prefix.
 * Returns origin + pathname only (https, no credentials/search/hash), with trailing
 * slashes stripped.
 */
export declare function assertContainerUrl(url: string): string;
/**
 * Serializes a value as a JavaScript literal safe for embedding in a script.
 * Escapes `<` to prevent closing the script tag early.
 */
export declare function toJsLiteral(value: unknown): string;