refactor(CORE): [CORE] Migrate to Meteor 3.0

lib/mongo/OptimisticInvocation.js

@@ -1,20 +1,4 @@
-import { AsyncLocalStorage } from 'async_hooks';
-
-class OptimisticInvocation {
-    constructor() {
-        this.context = new AsyncLocalStorage();
-    }
-
-    get() {
-        return this.context.getStore();
-    }
-
-    withValue(value, fn) {
-        return this.context.run(value, () => fn());
-    }
-}
-
-const optimisticInvocation = new OptimisticInvocation;
+const optimisticInvocation = new Meteor.EnvironmentVariable();
 
 export default optimisticInvocation;