The official Visual Studio Code extension for the Effekt Programming Language.
You can install the extension through the marketplace (via. tab "Extensions").
Currently, the extension does not bundle the Effekt compiler, so you need to install it independently.
As a last step, you might need to set the path to the effekt binary in the VSCode plugin settings for effekt.
For Mac OS and Unix users this probably works out of the box after installing effekt with npm (that is, once the effekt command is in your path). For Windows users, you might need to set the path to effekt.cmd.
With this setup the extension should start the server when an Effekt file is opened.