void (@NotNull FileType type, String @Nullable ... defaultAssociatedExtensions) { PluginException.reportDeprecatedUsage("FileTypeManager#registerFileType", "Use `com.intellij.fileType` extension or `FileTypeFactory` instead."); List<FileNameMatcher> matchers = new ArrayList<>(); if (defaultAssociatedExtensions != null) { for (String extension : defaultAssociatedExtensions) { matchers.add(new ExtensionFileNameMatcher(extension)); } } doRegisterFileType(type, matchers); }