diff --git a/d2js/js/Makefile b/d2js/js/Makefile
index cc098c626..1b81115e5 100644
--- a/d2js/js/Makefile
+++ b/d2js/js/Makefile
@@ -21,4 +21,4 @@ node_modules:
 
 .PHONY: cleanup
 cleanup: test
-	prefix "$@" git checkout -- src/platform.js
+	prefix "$@" git checkout -- src/platform.js src/worker.js
diff --git a/d2js/js/README.md b/d2js/js/README.md
index 6ce7597c0..0afeb230b 100644
--- a/d2js/js/README.md
+++ b/d2js/js/README.md
@@ -31,36 +31,18 @@ bun add @terrastruct/d2
 
 ## Usage
 
-### Browser
+D2.js uses webworkers to call a WASM file.
 
 ```javascript
+// Same for Node or browser
 import { D2 } from '@terrastruct/d2';
+// Or using a CDN
+// import { D2 } from 'https://esm.sh/@terrastruct/d2';
 
 const d2 = new D2();
 
 const result = await d2.compile('x -> y');
 const svg = await d2.render(result.diagram);
-
-const result = await d2.compile('x -> y', {
-  layout: 'dagre',
-  sketch: true
-});
-```
-
-### Node
-
-```javascript
-import { D2 } from '@terrastruct/d2';
-
-const d2 = new D2();
-
-async function createDiagram() {
-  const result = await d2.compile('x -> y');
-  const svg = await d2.render(result.diagram);
-  console.log(svg);
-}
-
-createDiagram();
 ```
 
 ## API Reference
@@ -87,7 +69,7 @@ D2.js uses Bun, so install this first.
 ```bash
 git clone https://github.com/terrastruct/d2.git
 cd d2/d2js/js
-./make.sh
+./make.sh all
 ```
 
 If you change the main D2 source code, you should regenerate the WASM file:
@@ -97,6 +79,8 @@ If you change the main D2 source code, you should regenerate the WASM file:
 
 ### Running the Development Server
 
+Make sure you've built already, then run:
+
 ```bash
 bun run dev
 ```
diff --git a/d2js/js/build.js b/d2js/js/build.js
index 3c1cfeec5..a3d3a145f 100644
--- a/d2js/js/build.js
+++ b/d2js/js/build.js
@@ -23,12 +23,11 @@ await writeFile(
 );
 
 const commonConfig = {
-  splitting: false,
   sourcemap: "external",
   minify: true,
 };
 
-async function buildPlatformFile(platform) {
+async function buildDynamicFiles(platform) {
   const platformContent =
     platform === "node"
       ? `export * from "./platform.node.js";`
@@ -36,51 +35,50 @@ async function buildPlatformFile(platform) {
 
   const platformPath = join(SRC_DIR, "platform.js");
   await writeFile(platformPath, platformContent);
+
+  const workerSource =
+    platform === "node"
+      ? join(SRC_DIR, "worker.node.js")
+      : join(SRC_DIR, "worker.browser.js");
+
+  const workerTarget = join(SRC_DIR, "worker.js");
+  const workerContent = await readFile(workerSource, "utf8");
+  await writeFile(workerTarget, workerContent);
 }
 
 async function buildAndCopy(buildType) {
   const configs = {
     browser: {
       outdir: resolve(ROOT_DIR, "dist/browser"),
+      splitting: false,
       format: "esm",
       target: "browser",
       platform: "browser",
       loader: {
         ".js": "jsx",
       },
-      entrypoints: [
-        resolve(SRC_DIR, "index.js"),
-        resolve(SRC_DIR, "worker.js"),
-        resolve(SRC_DIR, "platform.js"),
-        resolve(SRC_DIR, "wasm-loader.browser.js"),
-      ],
+      entrypoints: [resolve(SRC_DIR, "index.js"), resolve(SRC_DIR, "worker.js")],
     },
     "node-esm": {
       outdir: resolve(ROOT_DIR, "dist/node-esm"),
+      splitting: true,
       format: "esm",
       target: "node",
       platform: "node",
-      entrypoints: [
-        resolve(SRC_DIR, "index.js"),
-        resolve(SRC_DIR, "worker.js"),
-        resolve(SRC_DIR, "platform.js"),
-      ],
+      entrypoints: [resolve(SRC_DIR, "index.js"), resolve(SRC_DIR, "worker.js")],
     },
     "node-cjs": {
       outdir: resolve(ROOT_DIR, "dist/node-cjs"),
+      splitting: false,
       format: "cjs",
       target: "node",
       platform: "node",
-      entrypoints: [
-        resolve(SRC_DIR, "index.js"),
-        resolve(SRC_DIR, "worker.js"),
-        resolve(SRC_DIR, "platform.js"),
-      ],
+      entrypoints: [resolve(SRC_DIR, "index.js"), resolve(SRC_DIR, "worker.js")],
     },
   };
 
   const config = configs[buildType];
-  await buildPlatformFile(config.platform);
+  await buildDynamicFiles(config.platform);
 
   const result = await build({
     ...commonConfig,
diff --git a/d2js/js/examples/basic.html b/d2js/js/examples/basic.html
index 3248f1b9c..caec7e428 100644
--- a/d2js/js/examples/basic.html
+++ b/d2js/js/examples/basic.html
@@ -30,7 +30,7 @@
     </div>
     <div id="output"></div>
     <script type="module">
-      import { D2 } from "../src/index.js";
+      import { D2 } from "../dist/browser/index.js";
       const d2 = new D2();
       window.compile = async () => {
         const input = document.getElementById("input").value;
diff --git a/d2js/js/package.json b/d2js/js/package.json
index 8e56af2e8..535b1c938 100644
--- a/d2js/js/package.json
+++ b/d2js/js/package.json
@@ -2,7 +2,7 @@
   "name": "@terrastruct/d2",
   "author": "Terrastruct, Inc.",
   "description": "D2.js is a wrapper around the WASM build of D2, the modern text-to-diagram language.",
-  "version": "0.1.11",
+  "version": "0.1.19",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/terrastruct/d2.git",
@@ -21,10 +21,14 @@
   "exports": {
     ".": {
       "browser": "./dist/browser/index.js",
-      "import": "./dist/node-esm/index.js",
+      "import": {
+        "browser": "./dist/browser/index.js",
+        "default": "./dist/node-esm/index.js"
+      },
       "require": "./dist/node-cjs/index.js",
       "default": "./dist/node-esm/index.js"
-    }
+    },
+    "./worker": "./dist/browser/worker.js"
   },
   "files": [
     "dist"
diff --git a/d2js/js/src/platform.browser.js b/d2js/js/src/platform.browser.js
index 34e45749f..052149742 100644
--- a/d2js/js/src/platform.browser.js
+++ b/d2js/js/src/platform.browser.js
@@ -11,18 +11,19 @@ export async function loadFile(path) {
 }
 
 export async function createWorker() {
-  // Combine wasmExecJs with worker script
-  const workerResponse = await fetch(new URL("./worker.js", import.meta.url));
-  if (!workerResponse.ok) {
+  let response = await fetch(new URL("./worker.js", import.meta.url));
+  if (!response.ok)
     throw new Error(
-      `Failed to load worker.js: ${workerResponse.status} ${workerResponse.statusText}`
+      `Failed to load worker.js: ${response.status} ${response.statusText}`
     );
-  }
-  const workerJs = await workerResponse.text();
+  let workerScript = await response.text();
 
-  const blob = new Blob(["(() => {", wasmExecJs, "})();", workerJs], {
-    type: "application/javascript",
+  let blob = new Blob([wasmExecJs, workerScript], {
+    type: "text/javascript;charset=utf-8",
   });
 
-  return new Worker(URL.createObjectURL(blob));
+  const worker = new Worker(URL.createObjectURL(blob), {
+    type: "module",
+  });
+  return worker;
 }
diff --git a/d2js/js/src/worker.browser.js b/d2js/js/src/worker.browser.js
new file mode 100644
index 000000000..361432b0d
--- /dev/null
+++ b/d2js/js/src/worker.browser.js
@@ -0,0 +1,10 @@
+import { setupMessageHandler } from "./worker.shared.js";
+
+async function initWasmBrowser(wasmBinary) {
+  const go = new Go();
+  const result = await WebAssembly.instantiate(wasmBinary, go.importObject);
+  go.run(result.instance);
+  return self.d2;
+}
+
+setupMessageHandler(false, self, initWasmBrowser);
diff --git a/d2js/js/src/worker.js b/d2js/js/src/worker.js
index 0878809d1..3e2e2def0 100644
--- a/d2js/js/src/worker.js
+++ b/d2js/js/src/worker.js
@@ -1,92 +1 @@
-const isNode = typeof process !== "undefined" && process.release?.name === "node";
-let currentPort;
-let wasm;
-let d2;
-
-async function initWasm(wasmBinary) {
-  const go = new Go();
-  const result = await WebAssembly.instantiate(wasmBinary, go.importObject);
-  go.run(result.instance);
-  return isNode ? global.d2 : self.d2;
-}
-
-function setupMessageHandler(port) {
-  currentPort = port;
-  if (isNode) {
-    port.on("message", handleMessage);
-  } else {
-    port.onmessage = (e) => handleMessage(e.data);
-  }
-}
-
-async function handleMessage(e) {
-  const { type, data } = e;
-
-  switch (type) {
-    case "init":
-      try {
-        if (isNode) {
-          eval(data.wasmExecContent);
-        }
-        d2 = await initWasm(data.wasm);
-        currentPort.postMessage({ type: "ready" });
-      } catch (err) {
-        currentPort.postMessage({
-          type: "error",
-          error: err.message,
-        });
-      }
-      break;
-
-    case "compile":
-      try {
-        const result = await d2.compile(JSON.stringify(data));
-        const response = JSON.parse(result);
-        if (response.error) {
-          throw new Error(response.error.message);
-        }
-        currentPort.postMessage({
-          type: "result",
-          data: response.data,
-        });
-      } catch (err) {
-        currentPort.postMessage({
-          type: "error",
-          error: err.message,
-        });
-      }
-      break;
-
-    case "render":
-      try {
-        const result = await d2.render(JSON.stringify(data));
-        const response = JSON.parse(result);
-        if (response.error) {
-          throw new Error(response.error.message);
-        }
-        currentPort.postMessage({
-          type: "result",
-          data: atob(response.data),
-        });
-      } catch (err) {
-        currentPort.postMessage({
-          type: "error",
-          error: err.message,
-        });
-      }
-      break;
-  }
-}
-
-async function init() {
-  if (isNode) {
-    const { parentPort } = await import("node:worker_threads");
-    setupMessageHandler(parentPort);
-  } else {
-    setupMessageHandler(self);
-  }
-}
-
-init().catch((err) => {
-  console.error("Initialization error:", err);
-});
+// Replaced at build time
diff --git a/d2js/js/src/worker.node.js b/d2js/js/src/worker.node.js
new file mode 100644
index 000000000..0f65334ef
--- /dev/null
+++ b/d2js/js/src/worker.node.js
@@ -0,0 +1,11 @@
+import { parentPort } from "node:worker_threads";
+import { setupMessageHandler } from "./worker.shared.js";
+
+async function initWasmNode(wasmBinary) {
+  const go = new Go();
+  const result = await WebAssembly.instantiate(wasmBinary, go.importObject);
+  go.run(result.instance);
+  return global.d2;
+}
+
+setupMessageHandler(true, parentPort, initWasmNode);
diff --git a/d2js/js/src/worker.shared.js b/d2js/js/src/worker.shared.js
new file mode 100644
index 000000000..bbd1293e8
--- /dev/null
+++ b/d2js/js/src/worker.shared.js
@@ -0,0 +1,52 @@
+let currentPort;
+let d2;
+
+export function setupMessageHandler(isNode, port, initWasm) {
+  currentPort = port;
+
+  const handleMessage = async (e) => {
+    const { type, data } = e;
+
+    switch (type) {
+      case "init":
+        try {
+          if (isNode) {
+            eval(data.wasmExecContent);
+          }
+          d2 = await initWasm(data.wasm);
+          currentPort.postMessage({ type: "ready" });
+        } catch (err) {
+          currentPort.postMessage({ type: "error", error: err.message });
+        }
+        break;
+
+      case "compile":
+        try {
+          const result = await d2.compile(JSON.stringify(data));
+          const response = JSON.parse(result);
+          if (response.error) throw new Error(response.error.message);
+          currentPort.postMessage({ type: "result", data: response.data });
+        } catch (err) {
+          currentPort.postMessage({ type: "error", error: err.message });
+        }
+        break;
+
+      case "render":
+        try {
+          const result = await d2.render(JSON.stringify(data));
+          const response = JSON.parse(result);
+          if (response.error) throw new Error(response.error.message);
+          currentPort.postMessage({ type: "result", data: atob(response.data) });
+        } catch (err) {
+          currentPort.postMessage({ type: "error", error: err.message });
+        }
+        break;
+    }
+  };
+
+  if (isNode) {
+    port.on("message", handleMessage);
+  } else {
+    port.onmessage = (e) => handleMessage(e.data);
+  }
+}