/**
 * Type guard that checks if a value is not `undefined` or `null`.
 *
 * Useful for filtering out nullable values while preserving type safety.
 *
 * @template T The value type.
 * @param value The value to check.
 * @returns `true` if the value is neither `undefined` nor `null`; otherwise `false`.
 *
 * @example
 * const arr = [1, null, 2, undefined, 3];
 * const filtered = arr.filter(isDefined); // [1, 2, 3]
 */
export declare function isDefined<T>(value: T | undefined | null): value is T;
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