declare global {
  /**
   * Exclude `null` from `T`.
   */
  type NonNull<T> = Exclude<T, null>;
  /**
   * Returns `true` if the value is not null.
   * @param value The value to check.
   *
   * @example
   * ```typescript
   * isNonNull(null); // => false
   * isNonNull(undefined); // => true
   * isNonNull(''); // => true
   * isNonNull(' '); // => true
   * isNonNull('a'); // => true
   * isNonNull(0); // => true
   * ```
   *
   * @example
   * ```typescript
   * const foo: string | null | undefined = null;
   * if (isNonNull(foo)) {
   *   const bar = foo; // bar :: string | undefined
   * }
   * ```
   *
   * @see {@link isNull}
   */
  function isNonNull<T>(value: T): value is NonNull<T>;
}
export {};
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