fix(util-user-agent-node): use import.meta and require.resolve

packages/util-user-agent-node/package.json

@@ -2,12 +2,13 @@
   "name": "@aws-sdk/util-user-agent-node",
   "version": "3.413.0",
   "scripts": {
-    "build": "concurrently 'yarn:build:cjs' 'yarn:build:es' 'yarn:build:types'",
+    "build": "concurrently 'yarn:build:cjs' 'yarn:build:es' 'yarn:build:types' && yarn build:custom",
     "build:cjs": "tsc -p tsconfig.cjs.json",
     "build:es": "tsc -p tsconfig.es.json",
     "build:include:deps": "lerna run --scope $npm_package_name --include-dependencies build",
     "build:types": "tsc -p tsconfig.types.json",
     "build:types:downlevel": "downlevel-dts dist-types dist-types/ts3.4",
+    "build:custom": "node ./scripts/post-build",
     "clean": "rimraf ./dist-* && rimraf *.tsbuildinfo",
     "test": "jest"
   },

packages/util-user-agent-node/scripts/post-build.js

@@ -0,0 +1,15 @@
+const fs = require("fs");
+const path = require("path");
+
+const pkg = path.join(__dirname, "..");
+
+function rm(file) {
+  if (fs.existsSync(file)) {
+    fs.rmSync(file);
+  }
+}
+
+if (fs.existsSync(path.join(pkg, "dist-es", "is-crt-available.esm.js"))) {
+  rm(path.join(pkg, "dist-es", "is-crt-available.js"));
+  fs.renameSync(path.join(pkg, "dist-es", "is-crt-available.esm.js"), path.join(pkg, "dist-es", "is-crt-available.js"));
+}

packages/util-user-agent-node/src/is-crt-available.esm.ts

@@ -0,0 +1,30 @@
+import { UserAgentPair } from "@smithy/types";
+
+let isAvailable = false;
+
+import("aws-crt")
+  .then((result) => (isAvailable = !!result))
+  .catch(() => {
+    isAvailable = false;
+  });
+
+/**
+ * @internal
+ */
+export const isCrtAvailable = (): UserAgentPair | null => {
+  try {
+    // Attempt to load ambient package aws-crt to verify if it exists.
+    // We cannot use dynamic import(https://github.com/tc39/proposal-dynamic-import) here because bundlers
+    // (WebPack, Rollup) will try to bundle this optional dependency and fail to build if not exist.
+    // Thus this user agent key will only available in Node.js runtime.
+    if (isAvailable) {
+      // Validate `module` to make sure this is not in a `require.js` scope.
+      // TODO: load package version.
+      return ["md/crt-avail"];
+    }
+    return null;
+  } catch (e) {
+    // No aws-crt package available in the runtime.
+    return null;
+  }
+};

packages/util-user-agent-node/src/is-crt-available.ts

@@ -9,7 +9,12 @@ export const isCrtAvailable = (): UserAgentPair | null => {
     // We cannot use dynamic import(https://github.com/tc39/proposal-dynamic-import) here because bundlers
     // (WebPack, Rollup) will try to bundle this optional dependency and fail to build if not exist.
     // Thus this user agent key will only available in Node.js runtime.
-    if (typeof require === "function" && typeof module !== "undefined" && require("aws-crt")) {
+    if (
+      typeof require === "function" &&
+      typeof require?.resolve === "function" &&
+      typeof module !== "undefined" &&
+      require.resolve("aws-crt")
+    ) {
       // Validate `module` to make sure this is not in a `require.js` scope.
       // TODO: load package version.
       return ["md/crt-avail"];

packages/util-user-agent-node/tsconfig.cjs.json

@@ -5,5 +5,6 @@
     "rootDir": "src"
   },
   "extends": "../../tsconfig.cjs.json",
-  "include": ["src/"]
+  "include": ["src/"],
+  "exclude": ["src/is-crt-available.esm.ts", "node_modules/", "**/*.spec.ts"]
 }

packages/util-user-agent-node/tsconfig.types.json

@@ -5,5 +5,6 @@
     "rootDir": "src"
   },
   "extends": "../../tsconfig.types.json",
-  "include": ["src/"]
+  "include": ["src/"],
+  "exclude": ["src/is-crt-available.esm.ts", "node_modules/", "**/*.spec.ts"]
 }