diff --git a/bin/build.ts b/bin/build.ts
new file mode 100644
index 0000000..9db2d4a
--- /dev/null
+++ b/bin/build.ts
@@ -0,0 +1,35 @@
+import { resolve } from 'path';
+import * as bundt from 'bundt';
+
+const root = resolve('packages');
+const minify = !process.argv.includes('--dev');
+
+let result: bundt.Output = {};
+
+async function run(mod: string) {
+	let dir = resolve(root, mod);
+	let stats = await bundt.build(dir, { minify });
+	Object.assign(result, stats);
+}
+
+try {
+	var timer = process.hrtime();
+	await Promise.all([
+		run('create-worktop'),
+		run('worktop.build'),
+		run('worktop'),
+	]);
+	timer = process.hrtime(timer);
+} catch (err) {
+	let msg = (err as Error).stack || err;
+	console.error(msg);
+	process.exit(1);
+}
+
+console.log(
+	await bundt.report(result, {
+		cwd: root,
+		gzip: true,
+		delta: timer,
+	})
+);
diff --git a/bin/index.js b/bin/index.js
deleted file mode 100644
index ac512c9..0000000
--- a/bin/index.js
+++ /dev/null
@@ -1,154 +0,0 @@
-// @ts-check
-const fs = require('node:fs');
-const { build } = require('esbuild');
-const { join, dirname } = require('node:path');
-const { builtinModules } = require('node:module');
-const utils = require('./utils');
-
-const packages = join(__dirname, '../packages');
-const overrides = {
-	worktop: {
-		'router.ts': '.'
-	}
-};
-
-/** @param {string} message */
-function bail(message) {
-	console.error(message);
-	process.exit(1);
-}
-
-/**
- * @param {string} modname
- * @param {boolean} isMulti
- */
-async function bundle(modname, isMulti = true) {
-	let pkgdir = join(packages, modname);
-	let pkg = require(join(pkgdir, 'package.json'));
-	let files = await fs.promises.readdir(
-		join(pkgdir, 'src')
-	);
-
-	let externals = [
-		pkg.name, ...builtinModules,
-		...Object.keys(pkg.dependencies||{}),
-		...Object.keys(pkg.peerDependencies||{}),
-	];
-
-	if (pkg.exports == null) {
-		return bail(`Missing "exports" in module: ${modname}`);
-	}
-
-	let outputs = [];
-	let encoder = new TextEncoder;
-
-	/**
-	 * @param {string} file
-	 * @param {Uint8Array|string} content
-	 */
-	async function write(file, content) {
-		await fs.promises.writeFile(file, content);
-		if (typeof content === 'string') content = encoder.encode(content);
-		outputs.push(utils.inspect(file, content));
-	}
-
-	let i=0, isTS=/\.ts$/, tasks=[];
-	let overs = overrides[modname] || {};
-
-	for (files.sort(); i < files.length; i++) {
-		let dts, file = files[i];
-		if (!isTS.test(file)) continue;
-		if (file == 'node_modules') continue;
-		if (/\.(test|d)\.ts$/.test(file)) continue;
-
-		if (isMulti) {
-			dts = file.replace(isTS, '.d.ts');
-			files.includes(dts) || bail(`Missing "${dts}" file!`);
-		}
-
-		let key = overs[file];
-		if (!key && file === 'index.ts') key = '.';
-		else if (!key) key = './' + file.replace(isTS, '');
-
-		let entry = pkg.exports[key];
-
-		if (!entry) {
-			if (typeof pkg.exports === 'string') {
-				let isCJS = /\.c?js$/.test(pkg.exports);
-				entry = { [isCJS ? 'require' : 'import']: pkg.exports };
-			} else if (pkg.exports.require || pkg.exports.import) {
-				entry = pkg.exports;
-			} else {
-				return bail(`Missing "exports" entry: ${key}`);
-			}
-
-			entry.import = entry.import || './fake.mjs';
-		}
-
-		if (!entry.import) return bail(`Missing "import" condition: ${key}`);
-		if (!entry.require) return bail(`Missing "require" condition: ${key}`);
-
-		tasks.push(async function () {
-			let input = join(pkgdir, 'src', file);
-			let output = join(pkgdir, entry.import);
-
-			// build ts -> esm
-			let esm = await build({
-				bundle: true,
-				format: 'esm',
-				sourcemap: false,
-				entryPoints: [input],
-				external: externals,
-				outfile: output,
-				target: 'es2019',
-				treeShaking: true,
-				logLevel: 'warning',
-				minifyIdentifiers: true,
-				minifySyntax: true,
-				charset: 'utf8',
-				write: false,
-			}).then(bundle => {
-				return bundle.outputFiles[0];
-			});
-
-			let outdir = dirname(esm.path);
-
-			// purge existing directory
-			if (isMulti && fs.existsSync(outdir)) {
-				await fs.promises.rm(outdir, {
-					recursive: true,
-					force: true,
-				});
-			}
-
-			// create dir (safe writes)
-			if (isMulti) await fs.promises.mkdir(outdir);
-			esm.path.endsWith('fake.mjs') || await write(esm.path, esm.contents);
-
-			// convert esm -> cjs
-			output = join(pkgdir, entry.require);
-			await write(output, utils.rewrite(esm.text));
-
-			if (isMulti) {
-				// foo.d.ts -> foo/index.d.ts
-				input = join(pkgdir, 'src', dts);
-				await write(
-					join(outdir, 'index.d.ts'),
-					await fs.promises.readFile(input)
-				);
-			}
-		}());
-	}
-
-	await Promise.all(tasks);
-	utils.table(modname, pkgdir, outputs);
-}
-
-/**
- * init
- */
-Promise.all([
-	bundle('worktop', true),
-	bundle('create-worktop', false),
-	bundle('worktop.build', false),
-]);
diff --git a/bin/register.js b/bin/register.js
index 2b4769c..62bc549 100644
--- a/bin/register.js
+++ b/bin/register.js
@@ -1,7 +1,5 @@
 // @ts-check
-const { transformSync } = require('esbuild');
-
-const loadJS = require.extensions['.js'];
+require('fetchy/polyfill');
 
 // @ts-ignore - worktop/cfw.cache
 globalThis.caches = { default: {} };
@@ -12,33 +10,3 @@ globalThis.crypto = require('crypto').webcrypto;
 // worktop/base64
 globalThis.btoa = (x) => Buffer.from(x, 'binary').toString('base64');
 globalThis.atob = (x) => Buffer.from(x, 'base64').toString('binary');
-
-require('fetchy/polyfill');
-
-require.extensions['.ts'] = function (Module, filename) {
-	const pitch = Module._compile.bind(Module);
-
-	Module._compile = source => {
-		const { code, warnings } = transformSync(source, {
-			loader: 'ts',
-			format: 'cjs',
-			target: 'es2019',
-			sourcemap: 'inline',
-			sourcefile: filename,
-			minifyIdentifiers: true,
-			minifySyntax: true,
-			treeShaking: true,
-			charset: 'utf8',
-		});
-
-		warnings.forEach(msg => {
-			console.warn(`\nesbuild warning in ${filename}:`);
-			console.warn(msg.location);
-			console.warn(msg.text);
-		});
-
-		return pitch(code, filename);
-	};
-
-	loadJS(Module, filename);
-}
diff --git a/bin/utils.js b/bin/utils.js
deleted file mode 100644
index ce9915e..0000000
--- a/bin/utils.js
+++ /dev/null
@@ -1,103 +0,0 @@
-// @ts-check
-// @see https://github.com/lukeed/bundt/blob/master/index.js
-const { white, cyan, dim } = require('kleur');
-const rimports = require('rewrite-imports');
-const { normalize } = require('path');
-const { gzipSync } = require('zlib');
-
-const _ = ' ';
-const UNITS = ['B ', 'kB', 'MB', 'GB'];
-const lpad = (str, max) => _.repeat(max - str.length) + str;
-const rpad = (str, max) => str + _.repeat(max - str.length);
-const th = dim().bold().italic().underline;
-
-/**
- * @typedef FileData
- * @property {string} file
- * @property {string} size
- * @property {string} gzip
- */
-
-/**
- * @param {string} file
- * @param {Uint8Array} buffer
- * @returns {FileData}
- */
-exports.inspect = function (file, buffer) {
-	let gz = gzipSync(buffer).byteLength;
-	return {
-		file: file,
-		gzip: size(gz),
-		size: size(buffer.byteLength),
-	};
-}
-
-function size(val=0) {
-	if (val < 1e3) return `${val} ${UNITS[0]}`;
-	let exp = Math.min(Math.floor(Math.log10(val) / 3), UNITS.length - 1) || 1;
-	let out = (val / Math.pow(1e3, exp)).toPrecision(3);
-	let idx = out.indexOf('.');
-	if (idx === -1) {
-		out += '.00';
-	} else if (out.length - idx - 1 !== 2) {
-		out = (out + '00').substring(0, idx + 3); // 2 + 1 for 0-based
-	}
-	return out + ' ' + UNITS[exp];
-}
-
-/**
- * @param {string} modname
- * @param {string} pkgdir
- * @param {FileData[]} files
- * @returns {void}
- */
-exports.table = function (modname, pkgdir, files) {
-	let f=modname.length, s=8, g=6;
-	let G1 = _+_, G2 = G1+G1, out='';
-
-	files.sort((a, b) => a.file.localeCompare(b.file)).forEach(obj => {
-		obj.file = normalize(
-			obj.file.replace(pkgdir, '')
-		);
-
-		f = Math.max(f, obj.file.length);
-		s = Math.max(s, obj.size.length);
-		g = Math.max(g, obj.gzip.length);
-	});
-
-	f += 2; // underline extension
-
-	out += G1 + th(rpad(modname, f)) + G2 + th(lpad('Filesize', s)) + G1 + dim().bold().italic(lpad('(gzip)', g));
-
-	files.forEach((obj, idx) => {
-		if (idx && idx % 3 === 0) out += '\n';
-		out += ('\n' + G1 + white(rpad(obj.file, f)) + G2 + cyan(lpad(obj.size, s)) + G1 + dim().italic(lpad(obj.gzip, g)));
-	});
-
-	console.log('\n' + out + '\n');
-}
-
-/**
- * @param {string} content The ESM input file
- * @see https://github.com/lukeed/bundt/blob/master/index.js#L131
- * @returns {string}
- */
-exports.rewrite = function (content) {
-	let footer = '';
-	return rimports(content)
-		.replace(/(^|\s|;)export default/, '$1module.exports =')
-		.replace(/(^|\s|;)export (const|(?:async )?function|class|let|var) (.+?)(?=(\(|\s|\=))/gi, (_, x, type, name) => {
-			footer += `\nexports.${name} = ${name};`;
-			return `${x}${type} ${name}`;
-		})
-		.replace(/(^|\s|\n|;?)export \{([\s\S]*?)\};?([\n\s]*?|$)/g, (_, x, names) => {
-			names.split(',').forEach(name => {
-				let [src, dest] = name.trim().split(/\s+as\s+/);
-				footer += `\nexports.${dest || src} = ${src};`;
-			});
-			return x;
-		})
-		.concat(
-			footer
-		);
-}
diff --git a/package.json b/package.json
index 09c98fe..8847fa1 100644
--- a/package.json
+++ b/package.json
@@ -10,17 +10,16 @@
     "node": ">=12"
   },
   "scripts": {
-    "build": "node bin",
-    "test": "uvu packages \".test.ts$\" -r ./bin/register",
+    "build": "tsm bin/build.ts",
+    "test": "uvu packages \".test.ts$\" -r tsm -r ./bin/register",
     "types": "tsc --noEmit --skipLibCheck"
   },
   "devDependencies": {
     "@types/node": "16.11.6",
-    "esbuild": "0.13.2",
+    "bundt": "2.0.0-next.1",
     "fetchy": "next",
     "is-uuid": "1.0.2",
-    "kleur": "4.1.4",
-    "rewrite-imports": "2.0.3",
+    "tsm": "2.2.1",
     "typescript": "4.5.4",
     "uvu": "0.5.2"
   }
diff --git a/packages/worktop/src/router.d.ts b/packages/worktop/src/index.d.ts
similarity index 100%
rename from packages/worktop/src/router.d.ts
rename to packages/worktop/src/index.d.ts
diff --git a/packages/worktop/src/router.ts b/packages/worktop/src/index.ts
similarity index 100%
rename from packages/worktop/src/router.ts
rename to packages/worktop/src/index.ts
diff --git a/tsconfig.json b/tsconfig.json
index a7704c7..7e27916 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -16,12 +16,13 @@
     "checkJs": true,
     "noEmit": true,
     "paths": {
-      "worktop": ["./packages/worktop/src/router.d.ts"],
+      "worktop": ["./packages/worktop/src/index.d.ts"],
       "worktop/*": ["./packages/worktop/src/*.d.ts"],
       "worktop.build": ["./packages/worktop.build/index.d.ts"],
     }
   },
   "include": [
+    "bin/*.ts",
     "packages/combos.ts",
     "packages/worktop/src",
     "packages/worktop/types",