diff --git a/_examples/assets/polyfill_performance.js b/_examples/assets/polyfill_performance.js
deleted file mode 100644
index 8096d10..0000000
--- a/_examples/assets/polyfill_performance.js
+++ /dev/null
@@ -1,36 +0,0 @@
-// @license http://opensource.org/licenses/MIT
-// copyright Paul Irish 2015
-
-
-// Date.now() is supported everywhere except IE8. For IE8 we use the Date.now polyfill
-//   github.com/Financial-Times/polyfill-service/blob/master/polyfills/Date.now/polyfill.js
-// as Safari 6 doesn't have support for NavigationTiming, we use a Date.now() timestamp for relative values
-
-// if you want values similar to what you'd get with real perf.now, place this towards the head of the page
-// but in reality, you're just getting the delta between now() calls, so it's not terribly important where it's placed
-
-
-(function(){
-
-  if ("performance" in globalThis == false) {
-      globalThis.performance = {};
-  }
-  
-  Date.now = (Date.now || function () {  // thanks IE8
-	  return new Date().getTime();
-  });
-
-  if ("now" in globalThis.performance == false){
-    
-    var nowOffset = Date.now();
-    
-    if (performance.timing && performance.timing.navigationStart){
-      nowOffset = performance.timing.navigationStart
-    }
-
-    globalThis.performance.now = function now(){
-      return Date.now() - nowOffset;
-    }
-  }
-
-})();
diff --git a/_examples/assets/shim.mjs b/_examples/assets/shim.mjs
deleted file mode 100644
index 7112ee7..0000000
--- a/_examples/assets/shim.mjs
+++ /dev/null
@@ -1,24 +0,0 @@
-import "./polyfill_performance.js";
-import "./wasm_exec.js";
-
-const go = new Go();
-
-let mod;
-
-export function init(m) {
-    mod = m;
-}
-
-async function run() {
-    const readyPromise = new Promise((resolve) => {
-        globalThis.ready = resolve;
-    });
-    const instance = new WebAssembly.Instance(mod, go.importObject);
-    go.run(instance);
-    await readyPromise;
-}
-
-export async function fetch(req, env, ctx) {
-    await run();
-    return handleRequest(req, { env, ctx });
-}
diff --git a/_examples/assets/wasm_exec.js b/_examples/assets/wasm_exec.js
deleted file mode 100644
index 3920013..0000000
--- a/_examples/assets/wasm_exec.js
+++ /dev/null
@@ -1,543 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-//
-// This file has been modified for use by the TinyGo compiler.
-
-(() => {
-	// Map multiple JavaScript environments to a single common API,
-	// preferring web standards over Node.js API.
-	//
-	// Environments considered:
-	// - Browsers
-	// - Node.js
-	// - Electron
-	// - Parcel
-
-	if (typeof global !== "undefined") {
-		// global already exists
-	} else if (typeof window !== "undefined") {
-		window.global = window;
-	} else if (typeof self !== "undefined") {
-		self.global = self;
-	} else {
-		throw new Error("cannot export Go (neither global, window nor self is defined)");
-	}
-
-	/*
-	if (!global.require && typeof require !== "undefined") {
-		global.require = require;
-	}
-	*/
-
-		/*
-	if (!global.fs && global.require) {
-		global.fs = require("fs");
-	}
-	*/
-
-	const enosys = () => {
-		const err = new Error("not implemented");
-		err.code = "ENOSYS";
-		return err;
-	};
-
-	if (!global.fs) {
-		let outputBuf = "";
-		global.fs = {
-			constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
-			writeSync(fd, buf) {
-				outputBuf += decoder.decode(buf);
-				const nl = outputBuf.lastIndexOf("\n");
-				if (nl != -1) {
-					console.log(outputBuf.substr(0, nl));
-					outputBuf = outputBuf.substr(nl + 1);
-				}
-				return buf.length;
-			},
-			write(fd, buf, offset, length, position, callback) {
-				if (offset !== 0 || length !== buf.length || position !== null) {
-					callback(enosys());
-					return;
-				}
-				const n = this.writeSync(fd, buf);
-				callback(null, n);
-			},
-			chmod(path, mode, callback) { callback(enosys()); },
-			chown(path, uid, gid, callback) { callback(enosys()); },
-			close(fd, callback) { callback(enosys()); },
-			fchmod(fd, mode, callback) { callback(enosys()); },
-			fchown(fd, uid, gid, callback) { callback(enosys()); },
-			fstat(fd, callback) { callback(enosys()); },
-			fsync(fd, callback) { callback(null); },
-			ftruncate(fd, length, callback) { callback(enosys()); },
-			lchown(path, uid, gid, callback) { callback(enosys()); },
-			link(path, link, callback) { callback(enosys()); },
-			lstat(path, callback) { callback(enosys()); },
-			mkdir(path, perm, callback) { callback(enosys()); },
-			open(path, flags, mode, callback) { callback(enosys()); },
-			read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
-			readdir(path, callback) { callback(enosys()); },
-			readlink(path, callback) { callback(enosys()); },
-			rename(from, to, callback) { callback(enosys()); },
-			rmdir(path, callback) { callback(enosys()); },
-			stat(path, callback) { callback(enosys()); },
-			symlink(path, link, callback) { callback(enosys()); },
-			truncate(path, length, callback) { callback(enosys()); },
-			unlink(path, callback) { callback(enosys()); },
-			utimes(path, atime, mtime, callback) { callback(enosys()); },
-		};
-	}
-
-	if (!global.process) {
-		global.process = {
-			getuid() { return -1; },
-			getgid() { return -1; },
-			geteuid() { return -1; },
-			getegid() { return -1; },
-			getgroups() { throw enosys(); },
-			pid: -1,
-			ppid: -1,
-			umask() { throw enosys(); },
-			cwd() { throw enosys(); },
-			chdir() { throw enosys(); },
-		}
-	}
-
-	/*
-	if (!global.crypto) {
-		const nodeCrypto = require("crypto");
-		global.crypto = {
-			getRandomValues(b) {
-				nodeCrypto.randomFillSync(b);
-			},
-		};
-	}
-	*/
-
-	if (!global.performance) {
-		global.performance = {
-			now() {
-				const [sec, nsec] = process.hrtime();
-				return sec * 1000 + nsec / 1000000;
-			},
-		};
-	}
-
-	/*
-	if (!global.TextEncoder) {
-		global.TextEncoder = require("util").TextEncoder;
-	}
-
-	if (!global.TextDecoder) {
-		global.TextDecoder = require("util").TextDecoder;
-	}
-	*/
-
-	// End of polyfills for common API.
-
-	const encoder = new TextEncoder("utf-8");
-	const decoder = new TextDecoder("utf-8");
-	var logLine = [];
-
-	global.Go = class {
-		constructor() {
-			this._callbackTimeouts = new Map();
-			this._nextCallbackTimeoutID = 1;
-
-			const mem = () => {
-				// The buffer may change when requesting more memory.
-				return new DataView(this._inst.exports.memory.buffer);
-			}
-
-			const setInt64 = (addr, v) => {
-				mem().setUint32(addr + 0, v, true);
-				mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
-			}
-
-			const getInt64 = (addr) => {
-				const low = mem().getUint32(addr + 0, true);
-				const high = mem().getInt32(addr + 4, true);
-				return low + high * 4294967296;
-			}
-
-			const loadValue = (addr) => {
-				const f = mem().getFloat64(addr, true);
-				if (f === 0) {
-					return undefined;
-				}
-				if (!isNaN(f)) {
-					return f;
-				}
-
-				const id = mem().getUint32(addr, true);
-				return this._values[id];
-			}
-
-			const storeValue = (addr, v) => {
-				const nanHead = 0x7FF80000;
-
-				if (typeof v === "number") {
-					if (isNaN(v)) {
-						mem().setUint32(addr + 4, nanHead, true);
-						mem().setUint32(addr, 0, true);
-						return;
-					}
-					if (v === 0) {
-						mem().setUint32(addr + 4, nanHead, true);
-						mem().setUint32(addr, 1, true);
-						return;
-					}
-					mem().setFloat64(addr, v, true);
-					return;
-				}
-
-				switch (v) {
-					case undefined:
-						mem().setFloat64(addr, 0, true);
-						return;
-					case null:
-						mem().setUint32(addr + 4, nanHead, true);
-						mem().setUint32(addr, 2, true);
-						return;
-					case true:
-						mem().setUint32(addr + 4, nanHead, true);
-						mem().setUint32(addr, 3, true);
-						return;
-					case false:
-						mem().setUint32(addr + 4, nanHead, true);
-						mem().setUint32(addr, 4, true);
-						return;
-				}
-
-				let id = this._ids.get(v);
-				if (id === undefined) {
-					id = this._idPool.pop();
-					if (id === undefined) {
-						id = this._values.length;
-					}
-					this._values[id] = v;
-					this._goRefCounts[id] = 0;
-					this._ids.set(v, id);
-				}
-				this._goRefCounts[id]++;
-				let typeFlag = 1;
-				switch (typeof v) {
-					case "string":
-						typeFlag = 2;
-						break;
-					case "symbol":
-						typeFlag = 3;
-						break;
-					case "function":
-						typeFlag = 4;
-						break;
-				}
-				mem().setUint32(addr + 4, nanHead | typeFlag, true);
-				mem().setUint32(addr, id, true);
-			}
-
-			const loadSlice = (array, len, cap) => {
-				return new Uint8Array(this._inst.exports.memory.buffer, array, len);
-			}
-
-			const loadSliceOfValues = (array, len, cap) => {
-				const a = new Array(len);
-				for (let i = 0; i < len; i++) {
-					a[i] = loadValue(array + i * 8);
-				}
-				return a;
-			}
-
-			const loadString = (ptr, len) => {
-				return decoder.decode(new DataView(this._inst.exports.memory.buffer, ptr, len));
-			}
-
-			const timeOrigin = Date.now() - performance.now();
-			this.importObject = {
-				wasi_snapshot_preview1: {
-					// https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#fd_write
-					fd_write: function(fd, iovs_ptr, iovs_len, nwritten_ptr) {
-						let nwritten = 0;
-						if (fd == 1) {
-							for (let iovs_i=0; iovs_i<iovs_len;iovs_i++) {
-								let iov_ptr = iovs_ptr+iovs_i*8; // assuming wasm32
-								let ptr = mem().getUint32(iov_ptr + 0, true);
-								let len = mem().getUint32(iov_ptr + 4, true);
-								nwritten += len;
-								for (let i=0; i<len; i++) {
-									let c = mem().getUint8(ptr+i);
-									if (c == 13) { // CR
-										// ignore
-									} else if (c == 10) { // LF
-										// write line
-										let line = decoder.decode(new Uint8Array(logLine));
-										logLine = [];
-										console.log(line);
-									} else {
-										logLine.push(c);
-									}
-								}
-							}
-						} else {
-							console.error('invalid file descriptor:', fd);
-						}
-						mem().setUint32(nwritten_ptr, nwritten, true);
-						return 0;
-					},
-					fd_close: () => 0,      // dummy
-					fd_fdstat_get: () => 0, // dummy
-					fd_seek: () => 0,       // dummy
-					"proc_exit": (code) => {
-						if (global.process) {
-							// Node.js
-							process.exit(code);
-						} else {
-							// Can't exit in a browser.
-							throw 'trying to exit with code ' + code;
-						}
-					},
-					random_get: (bufPtr, bufLen) => {
-						crypto.getRandomValues(loadSlice(bufPtr, bufLen));
-						return 0;
-					},
-				},
-				env: {
-					// func ticks() float64
-					"runtime.ticks": () => {
-						return timeOrigin + performance.now();
-					},
-
-					// func sleepTicks(timeout float64)
-					"runtime.sleepTicks": (timeout) => {
-						// Do not sleep, only reactivate scheduler after the given timeout.
-						setTimeout(this._inst.exports.go_scheduler, timeout);
-					},
-
-					// func finalizeRef(v ref)
-					"syscall/js.finalizeRef": (sp) => {
-						// Note: TinyGo does not support finalizers so this should never be
-						// called.
-						// console.error('syscall/js.finalizeRef not implemented');
-					},
-
-					// func stringVal(value string) ref
-					"syscall/js.stringVal": (ret_ptr, value_ptr, value_len) => {
-						const s = loadString(value_ptr, value_len);
-						storeValue(ret_ptr, s);
-					},
-
-					// func valueGet(v ref, p string) ref
-					"syscall/js.valueGet": (retval, v_addr, p_ptr, p_len) => {
-						let prop = loadString(p_ptr, p_len);
-						let value = loadValue(v_addr);
-						let result = Reflect.get(value, prop);
-						storeValue(retval, result);
-					},
-
-					// func valueSet(v ref, p string, x ref)
-					"syscall/js.valueSet": (v_addr, p_ptr, p_len, x_addr) => {
-						const v = loadValue(v_addr);
-						const p = loadString(p_ptr, p_len);
-						const x = loadValue(x_addr);
-						Reflect.set(v, p, x);
-					},
-
-					// func valueDelete(v ref, p string)
-					"syscall/js.valueDelete": (v_addr, p_ptr, p_len) => {
-						const v = loadValue(v_addr);
-						const p = loadString(p_ptr, p_len);
-						Reflect.deleteProperty(v, p);
-					},
-
-					// func valueIndex(v ref, i int) ref
-					"syscall/js.valueIndex": (ret_addr, v_addr, i) => {
-						storeValue(ret_addr, Reflect.get(loadValue(v_addr), i));
-					},
-
-					// valueSetIndex(v ref, i int, x ref)
-					"syscall/js.valueSetIndex": (v_addr, i, x_addr) => {
-						Reflect.set(loadValue(v_addr), i, loadValue(x_addr));
-					},
-
-					// func valueCall(v ref, m string, args []ref) (ref, bool)
-					"syscall/js.valueCall": (ret_addr, v_addr, m_ptr, m_len, args_ptr, args_len, args_cap) => {
-						const v = loadValue(v_addr);
-						const name = loadString(m_ptr, m_len);
-						const args = loadSliceOfValues(args_ptr, args_len, args_cap);
-						try {
-							const m = Reflect.get(v, name);
-							storeValue(ret_addr, Reflect.apply(m, v, args));
-							mem().setUint8(ret_addr + 8, 1);
-						} catch (err) {
-							storeValue(ret_addr, err);
-							mem().setUint8(ret_addr + 8, 0);
-						}
-					},
-
-					// func valueInvoke(v ref, args []ref) (ref, bool)
-					"syscall/js.valueInvoke": (ret_addr, v_addr, args_ptr, args_len, args_cap) => {
-						try {
-							const v = loadValue(v_addr);
-							const args = loadSliceOfValues(args_ptr, args_len, args_cap);
-							storeValue(ret_addr, Reflect.apply(v, undefined, args));
-							mem().setUint8(ret_addr + 8, 1);
-						} catch (err) {
-							storeValue(ret_addr, err);
-							mem().setUint8(ret_addr + 8, 0);
-						}
-					},
-
-					// func valueNew(v ref, args []ref) (ref, bool)
-					"syscall/js.valueNew": (ret_addr, v_addr, args_ptr, args_len, args_cap) => {
-						const v = loadValue(v_addr);
-						const args = loadSliceOfValues(args_ptr, args_len, args_cap);
-						try {
-							storeValue(ret_addr, Reflect.construct(v, args));
-							mem().setUint8(ret_addr + 8, 1);
-						} catch (err) {
-							storeValue(ret_addr, err);
-							mem().setUint8(ret_addr+ 8, 0);
-						}
-					},
-
-					// func valueLength(v ref) int
-					"syscall/js.valueLength": (v_addr) => {
-						return loadValue(v_addr).length;
-					},
-
-					// valuePrepareString(v ref) (ref, int)
-					"syscall/js.valuePrepareString": (ret_addr, v_addr) => {
-						const s = String(loadValue(v_addr));
-						const str = encoder.encode(s);
-						storeValue(ret_addr, str);
-						setInt64(ret_addr + 8, str.length);
-					},
-
-					// valueLoadString(v ref, b []byte)
-					"syscall/js.valueLoadString": (v_addr, slice_ptr, slice_len, slice_cap) => {
-						const str = loadValue(v_addr);
-						loadSlice(slice_ptr, slice_len, slice_cap).set(str);
-					},
-
-					// func valueInstanceOf(v ref, t ref) bool
-					"syscall/js.valueInstanceOf": (v_addr, t_addr) => {
- 						return loadValue(v_addr) instanceof loadValue(t_addr);
-					},
-
-					// func copyBytesToGo(dst []byte, src ref) (int, bool)
-					"syscall/js.copyBytesToGo": (ret_addr, dest_addr, dest_len, dest_cap, source_addr) => {
-						let num_bytes_copied_addr = ret_addr;
-						let returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
-
-						const dst = loadSlice(dest_addr, dest_len);
-						const src = loadValue(source_addr);
-						if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
-							mem().setUint8(returned_status_addr, 0); // Return "not ok" status
-							return;
-						}
-						const toCopy = src.subarray(0, dst.length);
-						dst.set(toCopy);
-						setInt64(num_bytes_copied_addr, toCopy.length);
-						mem().setUint8(returned_status_addr, 1); // Return "ok" status
-					},
-
-					// copyBytesToJS(dst ref, src []byte) (int, bool)
-					// Originally copied from upstream Go project, then modified:
-					//   https://github.com/golang/go/blob/3f995c3f3b43033013013e6c7ccc93a9b1411ca9/misc/wasm/wasm_exec.js#L404-L416
-					"syscall/js.copyBytesToJS": (ret_addr, dest_addr, source_addr, source_len, source_cap) => {
-						let num_bytes_copied_addr = ret_addr;
-						let returned_status_addr = ret_addr + 4; // Address of returned boolean status variable
-
-						const dst = loadValue(dest_addr);
-						const src = loadSlice(source_addr, source_len);
-						if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
-							mem().setUint8(returned_status_addr, 0); // Return "not ok" status
-							return;
-						}
-						const toCopy = src.subarray(0, dst.length);
-						dst.set(toCopy);
-						setInt64(num_bytes_copied_addr, toCopy.length);
-						mem().setUint8(returned_status_addr, 1); // Return "ok" status
-					},
-				}
-			};
-		}
-
-		async run(instance) {
-			this._inst = instance;
-			this._values = [ // JS values that Go currently has references to, indexed by reference id
-				NaN,
-				0,
-				null,
-				true,
-				false,
-				global,
-				this,
-			];
-			this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id
-			this._ids = new Map();  // mapping from JS values to reference ids
-			this._idPool = [];      // unused ids that have been garbage collected
-			this.exited = false;    // whether the Go program has exited
-
-			const mem = new DataView(this._inst.exports.memory.buffer)
-
-			while (true) {
-				const callbackPromise = new Promise((resolve) => {
-					this._resolveCallbackPromise = () => {
-						if (this.exited) {
-							throw new Error("bad callback: Go program has already exited");
-						}
-						setTimeout(resolve, 0); // make sure it is asynchronous
-					};
-				});
-				this._inst.exports._start();
-				if (this.exited) {
-					break;
-				}
-				await callbackPromise;
-			}
-		}
-
-		_resume() {
-			if (this.exited) {
-				throw new Error("Go program has already exited");
-			}
-			this._inst.exports.resume();
-			if (this.exited) {
-				this._resolveExitPromise();
-			}
-		}
-
-		_makeFuncWrapper(id) {
-			const go = this;
-			return function () {
-				const event = { id: id, this: this, args: arguments };
-				go._pendingEvent = event;
-				go._resume();
-				return event.result;
-			};
-		}
-	}
-
-	if (
-		global.require &&
-		global.require.main === module &&
-		global.process &&
-		global.process.versions &&
-		!global.process.versions.electron
-	) {
-		if (process.argv.length != 3) {
-			console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
-			process.exit(1);
-		}
-
-		const go = new Go();
-		WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
-			return go.run(result.instance);
-		}).catch((err) => {
-			console.error(err);
-			process.exit(1);
-		});
-	}
-})();
\ No newline at end of file
diff --git a/_examples/durable-object-counter/Makefile b/_examples/durable-object-counter/Makefile
index ff8d860..019492c 100644
--- a/_examples/durable-object-counter/Makefile
+++ b/_examples/durable-object-counter/Makefile
@@ -4,7 +4,7 @@ dev:
 
 .PHONY: build
 build:
-	mkdir -p build
+	go run ../../cmd/workers-assets-gen
 	tinygo build -o ./build/app.wasm -target wasm -no-debug ./...
 
 .PHONY: deploy
diff --git a/_examples/durable-object-counter/worker.mjs b/_examples/durable-object-counter/worker.mjs
index 751e9e0..1b7a277 100644
--- a/_examples/durable-object-counter/worker.mjs
+++ b/_examples/durable-object-counter/worker.mjs
@@ -1,9 +1,5 @@
-import * as imports from "../assets/shim.mjs";
-import mod from "./build/app.wasm";
-
-imports.init(mod);
-
-export default { fetch: imports.fetch }
+// export auto-generated entrypoint script
+export { default } from "./build/worker.mjs";
 
 // Durable Object
 
@@ -15,7 +11,7 @@ export class Counter {
   // Handle HTTP requests from clients.
   async fetch(request) {
     // Apply requested action.
-    let url = new URL(request.url);
+    const url = new URL(request.url);
 
     // Durable Object storage is automatically cached in-memory, so reading the
     // same key every request is fast. (That said, you could also store the