/**
 * @throws error with the supplied message, if the condition is not true.
 *
 * Can for example be used like a type guard in TypeScript.
 */
export declare function assert(condition: unknown, msg?: string): asserts condition;
/**
 * @throws error with the supplied message, if the value === undefined.
 *
 * Can be used like a type guard in TypeScript.
 */
export declare function assertDefined<T>(value: T, msg?: string): asserts value is Exclude<T, undefined>;
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