lots of important stuff (#1883)

* lots of important stuff

* Update Constants.js

src/rest/APIRouter.js

@@ -0,0 +1,35 @@
+const util = require('util');
+
+const noop = () => {}; // eslint-disable-line no-empty-function
+const methods = ['get', 'post', 'delete', 'patch', 'put'];
+const reflectors = [
+  'toString', 'valueOf', 'inspect', 'constructor',
+  Symbol.toPrimitive, util.inspect.custom,
+];
+
+function buildRoute(manager) {
+  const route = [''];
+  const handler = {
+    get(target, name) {
+      if (reflectors.includes(name)) return () => route.join('/');
+      if (methods.includes(name)) {
+        return options => manager.request(name, route.join('/'), Object.assign({
+          versioned: manager.versioned,
+          route: route.map((r, i) => {
+            if (/\d{16,19}/g.test(r)) return /channels|guilds/.test(route[i - 1]) ? r : ':id';
+            return r;
+          }).join('/'),
+        }, options));
+      }
+      route.push(name);
+      return new Proxy(noop, handler);
+    },
+    apply(target, _, args) {
+      route.push(...args.filter(x => x != null)); // eslint-disable-line eqeqeq
+      return new Proxy(noop, handler);
+    },
+  };
+  return new Proxy(noop, handler);
+}
+
+module.exports = buildRoute;