temporary warning when acceessing unknown env-variable while lazyEnv loads

src/vs/workbench/electron-browser/bootstrap/index.js

@@ -16,7 +16,24 @@ const ipc = electron.ipcRenderer;
 
 
 process.lazyEnv = new Promise(function (resolve) {
+
+	const origEnv = process.env;
+
+	// warn about missing environment variables
+	// while we are resolve lazyEnv
+	process.env = new Proxy(origEnv, {
+		get: function (target, name) {
+			const result = target[name];
+			if (typeof result === 'undefined') {
+				console.warn('process.env[\'' + name + '\'] is undefined AND \'process.lazyEnv\' is NOT READY yet.');
+			}
+			return result;
+		}
+	});
+
 	ipc.once('vscode:acceptShellEnv', function (event, shellEnv) {
+		// store process.env, mixin shellEnv, done
+		process.env = origEnv;
 		assign(process.env, shellEnv);
 		resolve(process.env);
 	});