terminal context not updating in nodejs child process

Question

Part of this program checks if java is installed and continues checking every two seconds, then proceeds once it's installed, how do i make it update the terminal context to be able to execute the java command without restarting the program itself?

var javaCheckLoop = setInterval(function(){

    checkJava(function(res){

        if(res){
            //java installed, continue
        } else {
            //java not found, keep checking
        }

    })

},2000)


function checkJava(callback) {

    //need terminal context to update so it can detect java
    var c = require('child_process').exec('java', (error, stdout, stderr) => {

        callback(stderr.includes("Usage")); //returns true if java is available via cmd

    });

};

Answer 1

while I did find a way to detect if java had been installed I didn't find a way to update the terminal context. I was previously trying to spawn java as a command, but the trick lied in the registry, which updates in real time and can be used to detect if java had been installed.

require('child_process').exec('reg query "HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment"', (error, data) => {

            callback(String(data).includes("javapath")); //returns true if javapath is present in the environment variables

});