perf: avoid Object.create(null)

Author: pi0

src/context.ts

@@ -1,12 +1,18 @@
 import type { RouterContext } from "./types";
 
+const RouterStaticMap = /* @__PURE__ */ (() => {
+  const C = function () {};
+  C.prototype = Object.create(null);
+  return C;
+})() as unknown as { new (): Record<string, any> };
+
 /**
  * Create a new router context.
  */
 export function createRouter<T = unknown>(): RouterContext<T> {
   const ctx: RouterContext<T> = {
     root: { key: "" },
-    static: Object.create(null),
+    static: new RouterStaticMap(),
   };
   return ctx;
 }

src/operations/_utils.ts

@@ -4,11 +4,17 @@ export function splitPath(path: string) {
   return path.split("/").filter(Boolean);
 }
 
+const RouteParams = /* @__PURE__ */ (() => {
+  const C = function RouteParams() {};
+  C.prototype = Object.create(null);
+  return C;
+})() as unknown as { new (): Record<string, any> };
+
 export function getMatchParams(
   segments: string[],
   paramsMap: ParamsIndexMap,
 ): MatchedRoute["params"] {
-  const params = Object.create(null);
+  const params = new RouteParams();
   for (const [index, name] of paramsMap) {
     const segment =
       index < 0 ? segments.slice(-1 * index).join("/") : segments[index];

src/operations/add.ts

@@ -1,6 +1,18 @@
 import type { RouterContext, ParamsIndexMap } from "../types";
 import { splitPath } from "./_utils";
 
+const NodeStaticMap = /* @__PURE__ */ (() => {
+  const C = function () {};
+  C.prototype = Object.create(null);
+  return C;
+})() as unknown as { new (): Record<string, any> };
+
+const NodeMethodsMap = /* @__PURE__ */ (() => {
+  const C = function () {};
+  C.prototype = Object.create(null);
+  return C;
+})() as unknown as { new (): Record<string, any> };
+
 /**
  * Add a route to the router context.
  */
@@ -53,7 +65,7 @@ export function addRoute<T>(
     } else {
       const staticNode = { key: segment };
       if (!node.static) {
-        node.static = Object.create(null);
+        node.static = new NodeStaticMap();
       }
       node.static![segment] = staticNode;
       node = staticNode;
@@ -63,7 +75,7 @@ export function addRoute<T>(
   // Assign index, params and data to the node
   const hasParams = paramsMap.length > 0;
   if (!node.methods) {
-    node.methods = Object.create(null);
+    node.methods = new NodeMethodsMap();
   }
   if (!node.methods![method]) {
     node.methods![method] = [];

test/bench/bundle.test.ts

@@ -13,9 +13,9 @@ describe("benchmark", () => {
       findAllRoutes();
     `;
     const { bytes, gzipSize } = await getBundleSize(code);
-    // console.log("bundle size", { bytes, gzipSize });
-    expect(bytes).toBeLessThanOrEqual(2500); // <2.5kb
-    expect(gzipSize).toBeLessThanOrEqual(1000); // <1kb
+    console.log("bundle size", { bytes, gzipSize });
+    expect(bytes).toBeLessThanOrEqual(3000); // <3kb
+    expect(gzipSize).toBeLessThanOrEqual(1500); // <1.5kb
   });
 });