diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6e596d0..08059c4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,28 +10,27 @@ on:
 
 jobs:
   test:
-    name: Node.js v${{ matrix.nodejs }}
-    runs-on: ubuntu-latest
+    name: Node.js v${{ matrix.nodejs }} (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 3
     strategy:
       matrix:
         nodejs: [12, 14, 16]
+        os: [ubuntu-latest, windows-latest]
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.nodejs }}
 
-    - name: (env) pnpm
-      run: curl -L https://raw.githubusercontent.com/pnpm/self-installer/master/install.js | node
-
     - name: Install
-      run: pnpm install
+      run: npm install
 
     - name: Compiles
-      run: pnpm run build
+      run: npm run build
 
     - name: Type Checks
-      run: pnpm run types
+      run: npm run types
 
     - name: Tests <~ ESM
       run: node --loader ./loader.mjs test/index.mjs
@@ -44,3 +43,9 @@ jobs:
 
     - name: Tests <~ CommonJS <~ TypeScript
       run: node -r ./require.js test/config/index.ts --tsmconfig test/config/tsm.js
+
+    - name: Tests <~ CLI
+      run: node bin.js test/index.mjs
+
+    - name: Tests <~ CLI <~ TypeScript
+      run: node bin.js test/config/index.ts --tsmconfig test/config/tsm.js
diff --git a/src/bin.ts b/src/bin.ts
index a30777d..18a65f7 100644
--- a/src/bin.ts
+++ b/src/bin.ts
@@ -27,7 +27,5 @@ if (argv.includes('-v') || argv.includes('--version')) {
 	process.exit(0);
 }
 
-let file = require('path').join(__dirname, 'loader.mjs');
-require('child_process').spawn('node', ['--loader', file, ...argv], {
-	stdio: 'inherit'
-}).on('exit', process.exit);
+argv = ['--loader', './loader.mjs', ...argv];
+require('child_process').spawn('node', argv, { stdio: 'inherit' }).on('exit', process.exit);
diff --git a/src/loader.ts b/src/loader.ts
index 1880533..546c4db 100644
--- a/src/loader.ts
+++ b/src/loader.ts
@@ -1,5 +1,5 @@
-import * as url from 'url';
 import { existsSync } from 'fs';
+import { fileURLToPath, URL } from 'url';
 import * as tsm from './utils.js';
 
 import type { Config, Extension, Options } from 'tsm/config';
@@ -9,7 +9,7 @@ let config: Config;
 let esbuild: typeof import('esbuild');
 
 let env = (tsm as TSM).$defaults('esm');
-let setup = env.file && import(env.file);
+let setup = env.file && import('file:///' + env.file);
 
 type Promisable<T> = Promise<T> | T;
 type Source = string | SharedArrayBuffer | Uint8Array;
@@ -52,18 +52,18 @@ async function toOptions(uri: string): Promise<Options|void> {
 }
 
 function check(fileurl: string): string | void {
-	let tmp = url.fileURLToPath(fileurl);
+	let tmp = fileURLToPath(fileurl);
 	if (existsSync(tmp)) return fileurl;
 }
 
-const root = url.pathToFileURL(process.cwd() + '/');
+const root = new URL('file:///' + process.cwd() + '/');
 export const resolve: Resolve = async function (ident, context, fallback) {
 	// ignore "prefix:" and non-relative identifiers
 	if (/^\w+\:?/.test(ident)) return fallback(ident, context, fallback);
 
 	let match: RegExpExecArray | null;
 	let idx: number, ext: Extension, path: string | void;
-	let output = new url.URL(ident, context.parentURL || root);
+	let output = new URL(ident, context.parentURL || root);
 
 	// source ident includes extension
 	if (match = EXTN.exec(output.href)) {
diff --git a/src/require.ts b/src/require.ts
index bc931db..2317c3d 100644
--- a/src/require.ts
+++ b/src/require.ts
@@ -18,8 +18,8 @@ let config: Config = (tsm as TSM).$finalize(env, uconf);
 
 declare const $$req: NodeJS.Require;
 const tsrequire = 'var $$req=require("module").createRequire(__filename);require=(' + function () {
-	let { existsSync } = $$req('fs');
-	let { URL, pathToFileURL } = $$req('url');
+	let { existsSync } = $$req('fs') as typeof import('fs');
+	let $url = $$req('url') as typeof import('url');
 
 	return new Proxy(require, {
 		// NOTE: only here if source is TS
@@ -34,8 +34,8 @@ const tsrequire = 'var $$req=require("module").createRequire(__filename);require
 			let match = /\.([mc])?js(?=\?|$)/.exec(ident);
 			if (match == null) return $$req(ident);
 
-			let base = pathToFileURL(__filename) as import('url').URL;
-			let file = new URL(ident, base).pathname as string;
+			let base = $url.pathToFileURL(__filename);
+			let file = $url.fileURLToPath(new $url.URL(ident, base));
 			if (existsSync(file)) return $$req(ident);
 
 			// ?js -> ?ts file