export function assertUnreachable(x: never): never {
  throw new Error(
    `Didn't expect to get here. Unexpected value: ${JSON.stringify(x)}`
  );
}

/** @link https://stackoverflow.com/a/69413184 */
// @ts-expect-error helper to assert type to be another compile time
export const assertType = <A, B extends A>() => {}; // eslint-disable-line

export type Unpacked<T> = T extends (infer U)[]
  ? U
  : T extends (...args: unknown[]) => infer U
  ? U
  : T extends Promise<infer U>
  ? U
  : T;

export type Nullish<T> = T | null | undefined;