refactor: improve null proto obj

Author: pi0

src/_utils.ts

@@ -1,5 +1,2 @@
-export const EmptyObject = /* @__PURE__ */ (() => {
-  const C = function () {};
-  C.prototype = Object.create(null);
-  return C;
-})() as unknown as { new (): any };
+// prettier-ignore
+export const NullProtoObj = /* @__PURE__ */ (()=>{const e=function(){};return e.prototype=Object.create(null),Object.freeze(e.prototype),e})() as unknown as { new (): any };

src/context.ts

@@ -1,4 +1,4 @@
-import { EmptyObject } from "./_utils";
+import { NullProtoObj } from "./_utils";
 import type { RouterContext } from "./types";
 
 /**
@@ -7,7 +7,7 @@ import type { RouterContext } from "./types";
 export function createRouter<T = unknown>(): RouterContext<T> {
   const ctx: RouterContext<T> = {
     root: { key: "" },
-    static: new EmptyObject(),
+    static: new NullProtoObj(),
   };
   return ctx;
 }

src/operations/_utils.ts

@@ -1,4 +1,4 @@
-import { EmptyObject } from "../_utils";
+import { NullProtoObj } from "../_utils";
 import type { MatchedRoute, ParamsIndexMap } from "../types";
 
 export function splitPath(path: string) {
@@ -9,7 +9,7 @@ export function getMatchParams(
   segments: string[],
   paramsMap: ParamsIndexMap,
 ): MatchedRoute["params"] {
-  const params = new EmptyObject();
+  const params = new NullProtoObj();
   for (const [index, name] of paramsMap) {
     const segment =
       index < 0 ? segments.slice(-1 * index).join("/") : segments[index];

src/operations/add.ts

@@ -1,4 +1,4 @@
-import { EmptyObject } from "../_utils";
+import { NullProtoObj } from "../_utils";
 import type { RouterContext, ParamsIndexMap } from "../types";
 import { splitPath } from "./_utils";
 
@@ -60,7 +60,7 @@ export function addRoute<T>(
     } else {
       const staticNode = { key: segment };
       if (!node.static) {
-        node.static = new EmptyObject();
+        node.static = new NullProtoObj();
       }
       node.static![segment] = staticNode;
       node = staticNode;
@@ -70,7 +70,7 @@ export function addRoute<T>(
   // Assign index, params and data to the node
   const hasParams = paramsMap.length > 0;
   if (!node.methods) {
-    node.methods = new EmptyObject();
+    node.methods = new NullProtoObj();
   }
   if (!node.methods![method]) {
     node.methods![method] = [];