Express is working in deno

README.md

@@ -179,13 +179,13 @@ import { NinetyRing, NinetyRingWithBg } from "https://esm.sh/react-svg-spinners@
 esm.sh is a **Deno-friendly** CDN that resolves Node's built-in modules (such as **fs**, **os**, etc.), making it compatible with Deno.
 
 ```javascript
-import postcss from "https://esm.sh/postcss"
-import autoprefixer from "https://esm.sh/autoprefixer"
+import express from "https://esm.sh/express";
 
-const { css } = await postcss([ autoprefixer ]).process(`
-  backdrop-filter: blur(5px);
-  user-select: none;
-.async()
+const app = express();
+app.get("/", (req, res) => {
+  res.send("Hello World");
+});
+app.listen(3000)
 ```
 
 For users using deno `< 1.31`, esm.sh uses [deno.land/[email protected]/node](https://deno.land/[email protected]/node) as node compatibility layer. You can specify a different version by adding the `?deno-std=$VER` query:

server/build.go

@@ -885,25 +885,17 @@ esbuild:
 				}
 			}
 
+			// most of npm packages check for window object to detect browser environment, but Deno also has the window object
+			// so we need to replace the check with document object
 			if task.Target == "deno" || task.Target == "denonext" {
-				// inject xhr polyfill for axios
-				switch task.Pkg.Name {
-				case "axios", "cross-fetch", "whatwg-fetch":
-					outputContent = bytes.Join([][]byte{
-						[]byte(`import "https://deno.land/x/[email protected]/mod.ts";`),
-						outputContent,
-					}, []byte{})
-				}
-				// most of npm packages check for window object to detect browser environment, but Deno also has the window object
-				// so we need to replace the check with document object
 				if task.DevMode {
 					outputContent = bytes.Replace(outputContent, []byte("typeof window !== \"undefined\""), []byte("typeof document !== \"undefined\""), -1)
 				} else {
 					outputContent = bytes.Replace(outputContent, []byte("typeof window<\"u\""), []byte("typeof document<\"u\""), -1)
 				}
 			}
 
-			_, err = buf.Write(outputContent)
+			_, err = buf.Write(rewriteJS(task, outputContent))
 			if err != nil {
 				return
 			}

server/rewrite.go

@@ -0,0 +1,26 @@
+package server
+
+import (
+	"bytes"
+
+	"github.com/Masterminds/semver/v3"
+)
+
+func rewriteJS(task *BuildTask, js []byte) []byte {
+	denoTarget := task.Target == "deno" || task.Target == "denonext"
+	switch task.Pkg.Name {
+	case "axios", "cross-fetch", "whatwg-fetch":
+		if denoTarget {
+			xhr := []byte(`import "https://deno.land/x/[email protected]/mod.ts";`)
+			buf := make([]byte, len(js)+len(xhr))
+			copy(buf, xhr)
+			copy(buf[len(xhr):], js)
+			js = buf
+		}
+	case "iconv-lite":
+		if denoTarget && semver.MustParse(task.Pkg.Version).LessThan(semver.MustParse("0.5.0")) {
+			js = bytes.Replace(js, []byte("__Process$.versions.node"), []byte("void 0"), 1)
+		}
+	}
+	return js
+}

test/express/express.test.ts

@@ -0,0 +1,33 @@
+import { assertEquals } from "https://deno.land/[email protected]/testing/asserts.ts";
+
+import express, {
+  type Request,
+  type Response,
+} from "http://localhost:8080/express@4";
+
+Deno.test(
+  "express",
+  { sanitizeOps: false, sanitizeResources: false },
+  async () => {
+    const app = express();
+    app.get("/", (_req: Request, res: Response) => {
+      // @ts-ignore
+      res.send("Hello World");
+    });
+
+    const ac = new AbortController();
+    await new Promise<void>((resolve, reject) => {
+      const server = app.listen({ port: 3333 }, (err?: Error) => {
+        if (err) reject(err);
+        resolve();
+      });
+      ac.signal.onabort = () => {
+        server.close();
+      };
+    });
+
+    const res = await fetch("http://localhost:3333");
+    assertEquals(await res.text(), "Hello World");
+    ac.abort();
+  },
+);