@ApiStatus.Internal
  public static Supplier<? extends FileTypeRegistry> setInstanceSupplier(@NotNull Supplier<? extends FileTypeRegistry> supplier) {
    Supplier<? extends FileTypeRegistry> oldValue = instanceGetter;
    instanceGetter = supplier;
    return oldValue;
  }
@ApiStatus.Internal
  public static Supplier<? extends FileTypeRegistry> setInstanceSupplier(@NotNull Supplier<? extends FileTypeRegistry> supplier)