XD: app.js and manifest.json file

main.js

function commandFunction(selection) {
    // The body of this function is added later
}

module.exports.commands = {
    "COMMAND_NAME": commandFunction
};

manifest.json

{
    "id": "PLUGIN_ID",
    "name": "PLUGIN_NAME",
    "version": "0.0.1",
    "description": "PLUGIN_DESCRIPTION",
    "icons": [{
        "width": 96,
        "height": 96,
        "path": "images/icon.png"
    }],
    "host": {
        "app": "XD",
        "minVersion": "13.0.0"
    },
    "uiEntryPoints": [
        {
            "type": "menu",
            "label": "COMMAND_LABEL",
            "commandId": "COMMAND_NAME"
        }
    ]
}