Add getEsmaVersionFromUA function

Author: ije

README.md

@@ -11,18 +11,11 @@ npm i esm-compat
 ## Usage
 
 ```js
-import { getBuildTargetFromUA } from 'esm-compat';
+import { getEsmaVersionFromUA } from "esm-compat"
 
 const ua = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36"
-const target = getBuildTargetFromUA(ua)
-console.log(target) // => es2022
-```
-
-## API
-
-```ts
-export const targets: Set<string>;
-export const getBuildTargetFromUA: (ua: string | null) => string;
+const version = getEsmaVersionFromUA(ua)
+console.log(version) // => es2022
 ```
 
 ## License

src/compat.ts

@@ -417,7 +417,7 @@ const jsTable: Record<string, Record<string, Version>> = {
     Chrome: [91, 0, 0],
     Deno: [1, 17, 0],
     Edge: [91, 0, 0],
-    Node: [2, 0, 0],
+    Node: [22, 0, 0],
   },
   ImportAttributes: {
     Chrome: [123, 0, 0],
@@ -482,14 +482,14 @@ const jsTable: Record<string, Record<string, Version>> = {
     Opera: [33, 0, 0],
     Safari: [10, 0, 0],
   },
-  // NodeColonPrefixImport: {
-  //   ES: [0, 0, 0],
-  //   Node: [14, 13, 1],
-  // },
-  // NodeColonPrefixRequire: {
-  //   ES: [0, 0, 0],
-  //   Node: [16, 0, 0],
-  // },
+  NodeColonPrefixImport: {
+    ES: [0, 0, 0],
+    Node: [14, 13, 1],
+  },
+  NodeColonPrefixRequire: {
+    ES: [0, 0, 0],
+    Node: [16, 0, 0],
+  },
   NullishCoalescing: {
     // Note: The latest version of "IE" failed this test: nullish coalescing operator (??)
     // Note: The latest version of "Rhino" failed this test: nullish coalescing operator (??)
@@ -780,7 +780,7 @@ const esmaUnsupportedFeatures: [string, number][] = [
 
 const rVersion = /^(\d+)\.(\d+)\.(\d+)/;
 
-/** get build target from the `User-Agent` header by checking the `jsTable` object. */
+/** get the build target for esm.sh service by checking the given `user-agent` header. */
 export const getBuildTargetFromUA = (userAgent: string | null) => {
   if (!userAgent || userAgent.startsWith("curl/")) {
     return "esnext";
@@ -825,3 +825,12 @@ export const getBuildTargetFromUA = (userAgent: string | null) => {
   }
   return "es2015";
 };
+
+/** get the esma version of a browser by checking the given `user-agent` header. */
+export const getEsmaVersionFromUA = (userAgent: string | null) => {
+  const target = getBuildTargetFromUA(userAgent);
+  if (target.startsWith("es")) {
+    return target;
+  }
+  return "esnext";
+};

test.mjs

@@ -1,16 +1,13 @@
 import { getBuildTargetFromUA } from "./dist/compat.js";
 
 const testData = {
-  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36":
-    "es2023",
-  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.3 Safari/605.1.15":
-    "es2021",
-    "ES/2022": "es2022",
-    "Deno/1.33.1": "deno",
-    "Deno/1.33.2": "denonext",
-    "Node.js/20.0.0": "node",
-    "undici": "node",
-
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36": "es2023",
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.3 Safari/605.1.15": "es2021",
+  "ES/2022": "es2022",
+  "Deno/1.33.1": "deno",
+  "Deno/1.33.2": "denonext",
+  "Node.js/20.0.0": "node",
+  "undici": "node",
 };
 
 for (const [ua, expected] of Object.entries(testData)) {

types/compat.d.ts

@@ -1,2 +1,3 @@
 export const targets: Set<string>;
 export const getBuildTargetFromUA: (ua: string | null) => string;
+export const getEsmaVersionFromUA: (ua: string | null) => string;