IJ provides a nice import for TextMate grammar file coming from: * TextMate bundle * Sublime bundle * VScode package.json See entry point from https://github.com/JetBrains/intellij-community/blob/9ad1c858cc67a30002096dbe13bc1cf42c52b497/plugins/textmate/src/org/jetbrains/plugins/textmate/TextMateServiceImpl.java#L240 For the case of Vscode package.json, you need just to select a package.json and it import the TextMate grammar + language-configuration.json. Takes a sample with Go. You need just to select the local file package.json https://github.com/golang/vscode-go/blob/89b02f46268ff6b0197cc780b5f3d02ba36f1cc7/extension/package.json and after that, it loads: * the proper language-configuration.json by using https://github.com/golang/vscode-go/blob/89b02f46268ff6b0197cc780b5f3d02ba36f1cc7/extension/package.json#L122 * the proper TextMate grammar files by using https://github.com/golang/vscode-go/blob/89b02f46268ff6b0197cc780b5f3d02ba36f1cc7/extension/package.json#L172