/**
 * Ensures a value is defined, throwing an error if it's null or undefined.
 *
 * @param value - The value to check
 * @param fieldName - Name of the field for error reporting
 * @returns The value if defined
 * @throws Error if value is null or undefined
 */
export declare function ensureDefined<T>(value: T | null | undefined, fieldName: string): T;
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