diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a86bac4..a5488b3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,3 +21,21 @@ jobs:
       test_target: "*.test.ts"
       jsr_dependencies: "@std/assert @std/async @cross/runtime"
       npm_dependencies: "sinon"
+  npm_build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Deno
+        uses: denoland/setup-deno@v1
+        with:
+          deno-version: v2.x
+      - name: Build npm package
+        run: deno task build:dist
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "lts/*"
+      - name: Smoke test Node artifact
+        run: node -e "import('./dist/npm.js')"
diff --git a/build/build.ts b/build/build.ts
index 1b8ce59..75f5c87 100644
--- a/build/build.ts
+++ b/build/build.ts
@@ -1,6 +1,5 @@
 import esbuild from "esbuild";
-import { dtsPlugin } from "esbuild-plugin-d.ts";
-import { cp, readFile, writeFile } from "@cross/fs";
+import { readFile, writeFile } from "@cross/fs";
 import { dirname, fromFileUrl, resolve } from "@std/path";
 
 /**
@@ -68,50 +67,51 @@ if (command === "clean") {
 
   /* Handle argument `build`: Transpile and generate typings */
 } else if (command === "build") {
+  // Plugin to bundle JSR packages like @cross/runtime by resolving them via Deno's cache
+  const jsrResolverPlugin: esbuild.Plugin = {
+    name: "jsr-resolver",
+    setup(pluginBuild) {
+      pluginBuild.onResolve({ filter: /^@cross\/runtime$/ }, async (_args) => {
+        const cmd = new Deno.Command("deno", {
+          args: ["info", "--json", "jsr:@cross/runtime"],
+          cwd: relativeProjectRoot,
+          stdout: "piped",
+          stderr: "piped",
+        });
+        const { stdout, success } = await cmd.output();
+        if (!success) return null;
+        const info = JSON.parse(new TextDecoder().decode(stdout));
+        const mod = info.modules?.find((m: { specifier: string; local?: string }) => m.local && m.specifier?.endsWith("mod.ts"));
+        if (mod?.local) return { path: mod.local, namespace: "jsr-ts" };
+        return null;
+      });
+      pluginBuild.onLoad({ filter: /.*/, namespace: "jsr-ts" }, async (args) => {
+        const contents = await Deno.readTextFile(args.path);
+        return { contents, loader: "ts" };
+      });
+    },
+  };
+
+  // Build the ESM JavaScript bundle
   await build({
-    entryPoints: [resolve(relativeProjectRoot, "mod.ts")],
+    entryPoints: [resolve(relativeProjectRoot, "npm.ts")],
     bundle: true,
     minify: true,
     sourcemap: false,
+    outdir: resolvedDistPath,
+    platform: "node",
+    format: "esm",
     // Mark runtime-specific modules as external - they won't be bundled
     // node:test is a Node.js built-in, bun:test is a Bun built-in
     external: ["bun:test", "node:test"],
+    plugins: [jsrResolverPlugin],
     // Use banner to add a comment
     banner: {
       js: `// @cross/test - Cross-runtime testing for Deno, Bun, and Node.js
 // This build is for Node.js. For Deno, use JSR: jsr:@cross/test
 `,
     },
-  }, [
-    {
-      outdir: resolvedDistPath,
-      platform: "node",
-      format: "cjs",
-      outExtension: { ".js": ".cjs" },
-    },
-    {
-      outdir: resolvedDistPath,
-      platform: "node",
-      format: "esm",
-      plugins: [dtsPlugin({
-        experimentalBundling: true,
-        tsconfig: {
-          compilerOptions: {
-            declaration: true,
-            emitDeclarationOnly: true,
-            allowImportingTsExtensions: true,
-            lib: ["es6", "dom"],
-          },
-        },
-      })],
-    },
-  ]);
-
-  // Just re-use the .d.ts for commonjs, as .d.cts
-  await cp(
-    resolve(resolvedDistPath, "mod.d.ts"),
-    resolve(resolvedDistPath, "mod.d.cts"),
-  );
+  });
 
   /* Handle argument `package`: Generate package.json based on a base config and values from deno.json */
 } else if (command === "package") {
diff --git a/build/package.template.json b/build/package.template.json
index 6f1086f..8a5b4e7 100644
--- a/build/package.template.json
+++ b/build/package.template.json
@@ -26,21 +26,10 @@
     "framework"
   ],
   "type": "module",
-  "main": "./dist/mod.cjs",
-  "module": "./dist/mod.js",
-  "types": "./dist/mod.d.ts",
+  "main": "./dist/npm.js",
   "exports": {
     "./package.json": "./package.json",
-    ".": {
-      "import": {
-        "types": "./dist/mod.d.ts",
-        "default": "./dist/mod.js"
-      },
-      "require": {
-        "types": "./dist/mod.d.cts",
-        "default": "./dist/mod.cjs"
-      }
-    }
+    ".": "./dist/npm.js"
   },
   "license": "MIT"
 }
diff --git a/deno.json b/deno.json
index 2a197b6..c0304ff 100644
--- a/deno.json
+++ b/deno.json
@@ -24,6 +24,6 @@
     "sinon": "npm:sinon@~19.0.2"
   },
   "publish": {
-    "exclude": [".github", "*.test.ts", "build", "dist"]
+    "exclude": [".github", "*.test.ts", "build", "dist", "npm.ts"]
   }
 }
diff --git a/npm.ts b/npm.ts
new file mode 100644
index 0000000..c96ef61
--- /dev/null
+++ b/npm.ts
@@ -0,0 +1,30 @@
+// Entry point for the npm (Node.js) build - uses the Node.js shim directly.
+// For cross-runtime usage via JSR, use jsr:@cross/test instead.
+import type { BrowserTestResult, TestSubject, WrappedTestOptions } from "./mod.ts";
+import { wrappedTest } from "./shims/node.ts";
+
+export type { BrowserTestResult, ContextStepFunction, SimpleStepFunction, StepFunction, StepOptions, StepSubject, TestContext, TestSubject, WrappedTest, WrappedTestOptions } from "./mod.ts";
+
+/**
+ * Defines and executes a single test (Node.js).
+ * @param name - The name of the test.
+ * @param testFn - The function containing the test logic.
+ * @param options? - Options for the test.
+ */
+export async function test(name: string, testFn: TestSubject, options: WrappedTestOptions = {}) {
+  await wrappedTest(name, testFn, options);
+}
+
+/**
+ * Not applicable in Node.js - always returns undefined.
+ */
+export function getTestResults(): BrowserTestResult[] | undefined {
+  return undefined;
+}
+
+/**
+ * Not applicable in Node.js - no-op.
+ */
+export function printTestSummary(): void {
+  // no-op
+}