Function assertEvent

packages/core/src/assert.ts:27–49

(
  event: TEvent,
  type: TAssertedDescriptor | readonly TAssertedDescriptor[]
)

 * ```
 */
export function assertEvent<
  TEvent extends EventObject,
  TAssertedDescriptor extends EventDescriptor<TEvent>
>(
  event: TEvent,
  type: TAssertedDescriptor | readonly TAssertedDescriptor[]
): asserts event is ExtractEvent<TEvent, TAssertedDescriptor> {
  const types = toArray(type);

  const matches = types.some((descriptor) =>
    matchesEventDescriptor(event.type, descriptor as string)
  );

  if (!matches) {
    const typesText =
      types.length === 1
        ? `type matching "${types[0]}"`
        : `one of types matching "${types.join('", "')}"`;
    throw new Error(
      `Expected event ${JSON.stringify(event)} to have ${typesText}`
    );
  }
}