/**
 * Check (in the compiler) that a switch block is exhaustive.
 * Documentation: https://www.typescriptlang.org/docs/handbook/2/narrowing.html#exhaustiveness-checking
 */
export declare function assertUnreachable(_x: never): never;
/** Returns a random ID, suitable to be used for example as an HTML element ID. */
export declare function generateId(): string;
