#945 Some cleanup

src/diagrams/state/id-cache.js

@@ -0,0 +1,16 @@
+const idCache = {};
+
+export const set = (key, val) => {
+  idCache[key] = val;
+};
+
+export const get = k => idCache[k];
+export const keys = () => Object.keys(idCache);
+export const size = () => keys().length;
+
+export default {
+  get,
+  set,
+  keys,
+  size
+};