Fix issue with Electron build

docs/TODO.md

@@ -1,3 +1,4 @@
 # TODO
 - Improve train link collision detection
 - Improve offensive AI
+- Fix escape key not working within Electorn while in-game

src/js/app/utility/escape.js

@@ -0,0 +1,22 @@
+app.utility.escape = (() => {
+  const pubsub = engine.utility.pubsub.create()
+  let state = false
+
+  window.addEventListener('keydown', (e) => {
+    if (e.code == 'Escape') {
+      pubsub.emit('down')
+      state = true
+    }
+  })
+
+  window.addEventListener('keyup', (e) => {
+    if (e.code == 'Escape') {
+      pubsub.emit('up')
+      state = false
+    }
+  })
+
+  return engine.utility.pubsub.decorate({
+    is: () => state,
+  }, pubsub)
+})()