@ai-sdk/provider-utils/src/is-non-nullable.ts

/**
 * Type guard that checks whether a value is not `null` or `undefined`.
 *
 * @template T - The type of the value to check.
 * @param value - The value to check.
 * @returns `true` if the value is neither `null` nor `undefined`, otherwise `false`.
 */
export function isNonNullable<T>(
  value: T | undefined | null,
): value is NonNullable<T> {
  return value != null;
}