/**
 * Asserts that value is truthy.
 * @param value - Value to check.
 * @param message - Optional error message to throw.
 */
export declare function assert(value: unknown, message?: string): asserts value;
/**
 * Makes sure that all cases are handled
 * @param x - cases of value to check
 */
export declare function assertUnreachable(x: never): never;
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