This is the dedicated server module, used for modding singleplayer in more powerful ways.
ModAPI.dedicatedServer has the following methods:
appendCode(code: Function | String) : void
Eaglercraft runs the dedicated server in a service worker. This means that in order to run code to mod the dedicated server, you have to change context into the service worker.
ModAPI.dedicatedServer.appendCode() allows you to inject code into the dedicates server before startup. The code injected will throw errors if it attempts to access resources outside the functions context.
For example, take a look at this mod, which will inject some code that does nothing into the dedicated server:
var myVariable = 4;
function myServerSideModCode() {
function subfunction() {
console.log("serverside!!!");
}
subfunction();
//Successfully running serverside
//However, we cannot access `myVariable`
}
ModAPI.dedicatedServer.appendCode(myServerSideModCode);
Once serverside, you can only access server side events, like serverstart or tick.