/**
 * Returns `true` if the value is undefined.
 * @param value The value to check.
 *
 * @example
 * ```typescript
 * isUndefined(null); // => false
 * isUndefined(undefined); // => true
 * isUndefined(''); // => false
 * isUndefined(' '); // => false
 * isUndefined('a'); // => false
 * isUndefined(0); // => false
 * ```
 *
 * @example
 * ```typescript
 * const foo: string | undefined = null;
 * if (isUndefined(foo)) {
 *   const bar = foo; // bar :: undefined
 * }
 * ```
 */
declare const isUndefined: (value: unknown) => value is undefined;
export default isUndefined;
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