Support ES/20xx user agent header

Author: ije

server/compat.go

@@ -189,15 +189,15 @@ func getBuildTargetByUA(ua string) string {
 	if ua == "" || strings.HasPrefix(ua, "curl/") {
 		return "esnext"
 	}
-	if strings.HasPrefix(ua, "esm/") {
-		t := ua[4:]
+	if strings.HasPrefix(ua, "ES/") {
+		t := "es" + ua[3:]
 		if _, ok := targets[t]; ok {
 			return t
 		}
 		return "esnext"
 	}
 	if strings.HasPrefix(ua, "Deno/") {
-		uaVersion, err := semver.NewVersion(strings.TrimPrefix(ua, "Deno/"))
+		uaVersion, err := semver.NewVersion(ua[5:])
 		if err == nil && uaVersion.LessThan(v1_33_2) {
 			return "deno"
 		}

test/esm-worker/test.ts

@@ -529,6 +529,7 @@ Deno.test("esm-worker", { sanitizeOps: false, sanitizeResources: false }, async
     };
     assertEquals(await getTarget("Deno/1.33.1"), "deno");
     assertEquals(await getTarget("Deno/1.33.2"), "denonext");
+    assertEquals(await getTarget("ES/2022"), "es2022");
   });
 
   await t.step("cache for different UAs", async () => {
@@ -556,7 +557,7 @@ Deno.test("esm-worker", { sanitizeOps: false, sanitizeResources: false }, async
       ),
       "/es2021/",
     );
-    assertStringIncludes(await fetchModule("/react@18.2.0", "esm/es2022"), "/es2022/");
+    assertStringIncludes(await fetchModule("/react@18.2.0", "ES/2022"), "/es2022/");
   });
 
   await t.step("fix urls", async () => {

worker/package.json

@@ -17,7 +17,7 @@
     "@cloudflare/workers-types": "4.20240620.0",
     "compare-versions": "6.1.0",
     "esbuild": "0.21.5" ,
-    "esm-compat": "0.0.6"
+    "esm-compat": "0.0.8"
   },
   "repository": "https://github.com/esm-dev/esm.sh",
   "license": "MIT"