1. Prerequisites

Download and Install IntelliJ IDEA

Download and install either IntelliJ IDEA Ultimate or IntelliJ IDEA Community Edition from here.

Check out Community Edition Source Files

Download the IntelliJ IDEA Community Edition source files as described in the IntelliJ IDEA Community Edition README file.

Install Required Plugins

Make sure that the Plugin DevKit and Gradle plugins are enabled.

Plugin DevKit plugin is bundled with IntelliJ IDEA until 2023.2.

Install and enable Grammar-Kit and PsiViewer (optionally) plugins.

Create a Project

Create an empty IntelliJ Platform Plugin project or start using IntelliJ Platform Plugin Template when creating a plugin hosted on GitHub.