/**
 * Normalize an arbitrary thrown value into an `Error` instance.
 *
 * Useful at error-pipeline boundaries (catch blocks, error middleware,
 * fallbacks) where TypeScript hands you `unknown` but downstream code
 * wants a real `Error` to inspect or rethrow. Duck-typed: any value
 * passing `isError` is returned as-is. Strings become `new Error(str)`;
 * any other value is stringified.
 */
export declare function normalizeError(input: unknown): Error;
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