diff --git a/.editorconfig b/.editorconfig
index 1c6314a..c888938 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -10,3 +10,6 @@ insert_final_newline = true
 [*.yml]
 indent_style = space
 indent_size = 2
+
+[package.json]
+indent_style = space
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 02e439e..4c247ee 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [^10.18.0, ^12.14.0, ^13.5.0]
+        node-version: [^12.22, ^14.16, ^15]
         os: [ubuntu-latest, windows-latest]
     steps:
       - uses: actions/checkout@v1
@@ -25,5 +25,3 @@ jobs:
       - run: npm install --no-audit
       - run: npm test
       - uses: codecov/codecov-action@v1
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 4f52d76..ff9a350 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
-/.nyc_output
 /coverage
 /node_modules
+/test/fixtures/typescript/compiled
+/test/broken-fixtures/typescript/compiled
diff --git a/README.md b/README.md
index c403a50..4466038 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # @ava/typescript
 
-Adds rudimentary [TypeScript](https://www.typescriptlang.org/) support to [AVA](https://avajs.dev).
+Adds [TypeScript](https://www.typescriptlang.org/) support to [AVA](https://avajs.dev).
 
 This is designed to work for projects that precompile TypeScript. It allows AVA to load the compiled JavaScript, while configuring AVA to treat the TypeScript files as test files.
 
@@ -24,7 +24,8 @@ Then, enable TypeScript support either in `package.json` or `ava.config.*`:
 		"typescript": {
 			"rewritePaths": {
 				"src/": "build/"
-			}
+			},
+			"compile": false
 		}
 	}
 }
@@ -32,6 +33,8 @@ Then, enable TypeScript support either in `package.json` or `ava.config.*`:
 
 Both keys and values of the `rewritePaths` object must end with a `/`. Paths are relative to your project directory.
 
+You can enable compilation via the `compile` property. If `false`, AVA will assume you have already compiled your project. If set to `'tsc'`, AVA will run the TypeScript compiler before running your tests. This can be inefficient when using AVA in watch mode.
+
 Output files are expected to have the `.js` extension.
 
 AVA searches your entire project for `*.js`, `*.cjs`, `*.mjs` and `*.ts` files (or other extensions you've configured). It will ignore such files found in the `rewritePaths` targets (e.g. `build/`). If you use more specific paths, for instance `build/main/`, you may need to change AVA's `files` configuration to ignore other directories.
diff --git a/index.js b/index.js
index c054114..8fc5369 100644
--- a/index.js
+++ b/index.js
@@ -1,56 +1,92 @@
 'use strict';
 const path = require('path');
-
 const escapeStringRegexp = require('escape-string-regexp');
-
+const execa = require('execa');
 const pkg = require('./package.json');
 
+const help = `See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md`;
+
 function isPlainObject(x) {
 	return x !== null && typeof x === 'object' && Reflect.getPrototypeOf(x) === Object.prototype;
 }
 
-function isValidExtensions(extensions) {
-	return Array.isArray(extensions) &&
-		extensions.length > 0 &&
-		extensions.every(ext => typeof ext === 'string' && ext !== '') &&
-		new Set(extensions).size === extensions.length;
-}
+function validate(target, properties) {
+	for (const key of Object.keys(properties)) {
+		const {required, isValid} = properties[key];
+		const missing = !Reflect.has(target, key);
 
-function isValidRewritePaths(rewritePaths) {
-	if (!isPlainObject(rewritePaths)) {
-		return false;
+		if (missing) {
+			if (required) {
+				throw new Error(`Missing '${key}' property in TypeScript configuration for AVA. ${help}`);
+			}
+
+			continue;
+		}
+
+		if (!isValid(target[key])) {
+			throw new Error(`Invalid '${key}' property in TypeScript configuration for AVA. ${help}`);
+		}
+	}
+
+	for (const key of Object.keys(target)) {
+		if (!Reflect.has(properties, key)) {
+			throw new Error(`Unexpected '${key}' property in TypeScript configuration for AVA. ${help}`);
+		}
 	}
+}
 
-	return Object.entries(rewritePaths).every(([from, to]) => {
-		return from.endsWith('/') && typeof to === 'string' && to.endsWith('/');
-	});
+async function compileTypeScript(projectDir) {
+	return execa('tsc', ['--incremental'], {preferLocal: true, cwd: projectDir});
 }
 
+const configProperties = {
+	compile: {
+		required: true,
+		isValid(compile) {
+			return compile === false || compile === 'tsc';
+		}
+	},
+	rewritePaths: {
+		required: true,
+		isValid(rewritePaths) {
+			if (!isPlainObject(rewritePaths)) {
+				return false;
+			}
+
+			return Object.entries(rewritePaths).every(([from, to]) => {
+				return from.endsWith('/') && typeof to === 'string' && to.endsWith('/');
+			});
+		}
+	},
+	extensions: {
+		required: false,
+		isValid(extensions) {
+			return Array.isArray(extensions) &&
+				extensions.length > 0 &&
+				extensions.every(ext => typeof ext === 'string' && ext !== '') &&
+				new Set(extensions).size === extensions.length;
+		}
+	}
+};
+
 module.exports = ({negotiateProtocol}) => {
-	const protocol = negotiateProtocol(['ava-3.2', 'ava-3'], {version: pkg.version});
+	const protocol = negotiateProtocol(['ava-3.2'], {version: pkg.version});
 	if (protocol === null) {
 		return;
 	}
 
 	return {
 		main({config}) {
-			let valid = false;
-			if (isPlainObject(config)) {
-				const keys = Object.keys(config);
-				if (keys.every(key => key === 'extensions' || key === 'rewritePaths')) {
-					valid =
-						(config.extensions === undefined || isValidExtensions(config.extensions)) &&
-						isValidRewritePaths(config.rewritePaths);
-				}
+			if (!isPlainObject(config)) {
+				throw new Error(`Unexpected Typescript configuration for AVA. ${help}`);
 			}
 
-			if (!valid) {
-				throw new Error(`Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.`);
-			}
+			validate(config, configProperties);
 
 			const {
 				extensions = ['ts'],
-				rewritePaths: relativeRewritePaths
+				rewritePaths: relativeRewritePaths,
+				compile
 			} = config;
 
 			const rewritePaths = Object.entries(relativeRewritePaths).map(([from, to]) => [
@@ -61,6 +97,10 @@ module.exports = ({negotiateProtocol}) => {
 
 			return {
 				async compile() {
+					if (compile === 'tsc') {
+						await compileTypeScript(protocol.projectDir);
+					}
+
 					return {
 						extensions: extensions.slice(),
 						rewritePaths: rewritePaths.slice()
diff --git a/package.json b/package.json
index 7e1ac53..c88c33c 100644
--- a/package.json
+++ b/package.json
@@ -1,9 +1,9 @@
 {
   "name": "@ava/typescript",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "TypeScript provider for AVA",
   "engines": {
-    "node": ">=10.18.0 <11 || >=12.14.0 <13 || >=13.5.0"
+    "node": ">=12.22 <13 || >=14.16 <15 || >=15"
   },
   "files": [
     "index.js"
@@ -16,25 +16,36 @@
     "typescript"
   ],
   "scripts": {
-    "test": "xo && nyc ava"
+    "test": "xo && c8 ava"
   },
   "dependencies": {
-    "escape-string-regexp": "^2.0.0"
+    "escape-string-regexp": "^4.0.0",
+    "execa": "^5.0.0"
   },
   "devDependencies": {
-    "ava": "^3.0.0",
-    "execa": "^4.0.0",
-    "nyc": "^15.0.0",
-    "xo": "^0.25.3"
+    "ava": "^3.15.0",
+    "c8": "^7.7.1",
+    "del": "^6.0.0",
+    "typescript": "^4.2.4",
+    "xo": "^0.38.2"
   },
-  "nyc": {
+  "c8": {
     "reporter": [
       "html",
       "lcov",
       "text"
     ]
   },
+  "ava": {
+    "files": [
+      "!test/broken-fixtures/**"
+    ],
+    "timeout": "60s"
+  },
   "xo": {
+    "ignores": [
+      "test/broken-fixtures"
+    ],
     "rules": {
       "import/order": "off"
     }
diff --git a/test/_with-provider.js b/test/_with-provider.js
new file mode 100644
index 0000000..9bc8089
--- /dev/null
+++ b/test/_with-provider.js
@@ -0,0 +1,23 @@
+const path = require('path');
+const pkg = require('../package.json');
+const makeProvider = require('..');
+
+const createProviderMacro = (identifier, avaVersion, projectDir = __dirname) => {
+	return (t, run) => run(t, makeProvider({
+		negotiateProtocol(identifiers, {version}) {
+			t.true(identifiers.includes(identifier));
+			t.is(version, pkg.version);
+			return {
+				ava: {avaVersion},
+				identifier,
+				normalizeGlobPatterns: patterns => patterns,
+				async findFiles({patterns}) {
+					return patterns.map(file => path.join(projectDir, file));
+				},
+				projectDir
+			};
+		}
+	}));
+};
+
+module.exports = createProviderMacro;
diff --git a/test/broken-fixtures/tsconfig.json b/test/broken-fixtures/tsconfig.json
new file mode 100644
index 0000000..47d862c
--- /dev/null
+++ b/test/broken-fixtures/tsconfig.json
@@ -0,0 +1,8 @@
+{
+	"compilerOptions": {
+		"outDir": "typescript/compiled"
+	},
+	"include": [
+		"typescript"
+	]
+}
diff --git a/test/broken-fixtures/typescript/typescript.ts b/test/broken-fixtures/typescript/typescript.ts
new file mode 100644
index 0000000..7898192
--- /dev/null
+++ b/test/broken-fixtures/typescript/typescript.ts
@@ -0,0 +1 @@
+a
diff --git a/test/compilation.js b/test/compilation.js
new file mode 100644
index 0000000..0a791dd
--- /dev/null
+++ b/test/compilation.js
@@ -0,0 +1,61 @@
+const path = require('path');
+const test = require('ava');
+const del = require('del');
+const execa = require('execa');
+const createProviderMacro = require('./_with-provider');
+
+const withProvider = createProviderMacro('ava-3.2', '3.2.0', path.join(__dirname, 'fixtures'));
+const withAltProvider = createProviderMacro('ava-3.2', '3.2.0', path.join(__dirname, 'broken-fixtures'));
+
+test.before('deleting compiled files', async t => {
+	t.log(await del('test/fixtures/typescript/compiled'));
+	t.log(await del('test/broken-fixtures/typescript/compiled'));
+});
+
+const compile = async provider => {
+	return {
+		state: await provider.main({
+			config: {
+				rewritePaths: {
+					'ts/': 'typescript/',
+					'compiled/': 'typescript/compiled/'
+				},
+				compile: 'tsc'
+			}
+		}).compile()
+	};
+};
+
+test('worker(): load rewritten paths files', withProvider, async (t, provider) => {
+	const {state} = await compile(provider);
+	const {stdout, stderr} = await execa.node(
+		path.join(__dirname, 'fixtures/install-and-load'),
+		[JSON.stringify(state), path.join(__dirname, 'fixtures/ts', 'file.ts')],
+		{cwd: path.join(__dirname, 'fixtures')}
+	);
+	if (stderr.length > 0) {
+		t.log(stderr);
+	}
+
+	t.snapshot(stdout);
+});
+
+test('worker(): runs compiled files', withProvider, async (t, provider) => {
+	const {state} = await compile(provider);
+	const {stdout, stderr} = await execa.node(
+		path.join(__dirname, 'fixtures/install-and-load'),
+		[JSON.stringify(state), path.join(__dirname, 'fixtures/compiled', 'index.ts')],
+		{cwd: path.join(__dirname, 'fixtures')}
+	);
+	if (stderr.length > 0) {
+		t.log(stderr);
+	}
+
+	t.snapshot(stdout);
+});
+
+test('compile() error', withAltProvider, async (t, provider) => {
+	const {message} = await t.throwsAsync(compile(provider));
+
+	t.snapshot(message);
+});
diff --git a/test/fixtures/install-and-load.js b/test/fixtures/install-and-load.js
index fce29b1..5e1f26c 100644
--- a/test/fixtures/install-and-load.js
+++ b/test/fixtures/install-and-load.js
@@ -3,16 +3,16 @@ const makeProvider = require('../..');
 
 const provider = makeProvider({
 	negotiateProtocol() {
-		return {identifier: process.argv[2], ava: {version: '3.0.0'}, projectDir: path.resolve(__dirname, '..')};
+		return {identifier: 'ava-3.2', ava: {version: '3.15.0'}, projectDir: __dirname};
 	}
 });
 
 const worker = provider.worker({
 	extensionsToLoadAsModules: [],
-	state: JSON.parse(process.argv[3])
+	state: JSON.parse(process.argv[2])
 });
 
-const ref = path.resolve(process.argv[4]);
+const ref = path.resolve(process.argv[3]);
 
 if (worker.canLoad(ref)) {
 	worker.load(ref, {requireFn: require});
diff --git a/test/fixtures/tsconfig.json b/test/fixtures/tsconfig.json
new file mode 100644
index 0000000..47d862c
--- /dev/null
+++ b/test/fixtures/tsconfig.json
@@ -0,0 +1,8 @@
+{
+	"compilerOptions": {
+		"outDir": "typescript/compiled"
+	},
+	"include": [
+		"typescript"
+	]
+}
diff --git a/test/fixtures/file.js b/test/fixtures/typescript/file.js
similarity index 100%
rename from test/fixtures/file.js
rename to test/fixtures/typescript/file.js
diff --git a/test/fixtures/typescript/index.ts b/test/fixtures/typescript/index.ts
new file mode 100644
index 0000000..1bc76e0
--- /dev/null
+++ b/test/fixtures/typescript/index.ts
@@ -0,0 +1 @@
+console.log('logged in fixtures/typescript/index.ts');
diff --git a/test/protocol-ava-3.2.js b/test/protocol-ava-3.2.js
index 8400002..476895f 100644
--- a/test/protocol-ava-3.2.js
+++ b/test/protocol-ava-3.2.js
@@ -1,41 +1,84 @@
 const path = require('path');
 const test = require('ava');
 const pkg = require('../package.json');
-const makeProvider = require('..');
-
-const withProvider = (t, run) => run(t, makeProvider({
-	negotiateProtocol(identifiers, {version}) {
-		t.true(identifiers.includes('ava-3.2'));
-		t.is(version, pkg.version);
-		return {
-			ava: {version: '3.2.0'},
-			identifier: 'ava-3.2',
-			normalizeGlobPatterns: patterns => patterns,
-			async findFiles({patterns}) {
-				return patterns.map(file => path.join(__dirname, file));
-			},
-			projectDir: __dirname
-		};
-	}
-}));
+const createProviderMacro = require('./_with-provider');
+
+const withProvider = createProviderMacro('ava-3.2', '3.15.0');
+
+const validateConfig = (t, provider, config) => {
+	const error = t.throws(() => provider.main({config}));
+	error.message = error.message.replace(`v${pkg.version}`, 'v${pkg.version}'); // eslint-disable-line no-template-curly-in-string
+	t.snapshot(error);
+};
 
 test('negotiates ava-3.2 protocol', withProvider, t => t.plan(2));
 
+test('main() config validation: throw when config is not a plain object', withProvider, (t, provider) => {
+	validateConfig(t, provider, false);
+	validateConfig(t, provider, true);
+	validateConfig(t, provider, null);
+	validateConfig(t, provider, []);
+});
+
+test('main() config validation: throw when config contains keys other than \'extensions\', \'rewritePaths\' or \'compile\'', withProvider, (t, provider) => {
+	validateConfig(t, provider, {compile: false, foo: 1, rewritePaths: {'src/': 'build/'}});
+});
+
+test('main() config validation: throw when config.extensions contains empty strings', withProvider, (t, provider) => {
+	validateConfig(t, provider, {extensions: ['']});
+});
+
+test('main() config validation: throw when config.extensions contains non-strings', withProvider, (t, provider) => {
+	validateConfig(t, provider, {extensions: [1]});
+});
+
+test('main() config validation: throw when config.extensions contains duplicates', withProvider, (t, provider) => {
+	validateConfig(t, provider, {extensions: ['ts', 'ts']});
+});
+
+test('main() config validation: config may not be an empty object', withProvider, (t, provider) => {
+	validateConfig(t, provider, {});
+});
+
+test('main() config validation: throw when config.compile is invalid', withProvider, (t, provider) => {
+	validateConfig(t, provider, {rewritePaths: {'src/': 'build/'}, compile: 1});
+	validateConfig(t, provider, {rewritePaths: {'src/': 'build/'}, compile: undefined});
+});
+
+test('main() config validation: rewrite paths must end in a /', withProvider, (t, provider) => {
+	validateConfig(t, provider, {rewritePaths: {src: 'build/', compile: false}});
+	validateConfig(t, provider, {rewritePaths: {'src/': 'build', compile: false}});
+});
+
+test('main() extensions: defaults to [\'ts\']', withProvider, (t, provider) => {
+	t.deepEqual(provider.main({config: {rewritePaths: {'src/': 'build/'}, compile: false}}).extensions, ['ts']);
+});
+
+test('main() extensions: returns configured extensions', withProvider, (t, provider) => {
+	const extensions = ['tsx'];
+	t.deepEqual(provider.main({config: {extensions, rewritePaths: {'src/': 'build/'}, compile: false}}).extensions, extensions);
+});
+
+test('main() extensions: always returns new arrays', withProvider, (t, provider) => {
+	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}, compile: false}});
+	t.not(main.extensions, main.extensions);
+});
+
 test('main() ignoreChange()', withProvider, (t, provider) => {
-	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}}});
+	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}, compile: false}});
 	t.true(main.ignoreChange(path.join(__dirname, 'src/foo.ts')));
 	t.false(main.ignoreChange(path.join(__dirname, 'build/foo.js')));
 });
 
 test('main() resolveTestfile()', withProvider, (t, provider) => {
-	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}}});
+	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}, compile: false}});
 	t.is(main.resolveTestFile(path.join(__dirname, 'src/foo.ts')), path.join(__dirname, 'build/foo.js'));
 	t.is(main.resolveTestFile(path.join(__dirname, 'build/foo.js')), path.join(__dirname, 'build/foo.js'));
 	t.is(main.resolveTestFile(path.join(__dirname, 'foo/bar.ts')), path.join(__dirname, 'foo/bar.ts'));
 });
 
 test('main() updateGlobs()', withProvider, (t, provider) => {
-	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}}});
+	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}, compile: false}});
 	t.snapshot(main.updateGlobs({
 		filePatterns: ['src/test.ts'],
 		ignoredByWatcherPatterns: ['assets/**']
diff --git a/test/protocol-ava-3.js b/test/protocol-ava-3.js
deleted file mode 100644
index 5839f6e..0000000
--- a/test/protocol-ava-3.js
+++ /dev/null
@@ -1,101 +0,0 @@
-const path = require('path');
-const test = require('ava');
-const execa = require('execa');
-const pkg = require('../package.json');
-const makeProvider = require('..');
-
-const withProvider = (t, run) => run(t, makeProvider({
-	negotiateProtocol(identifiers, {version}) {
-		t.true(identifiers.includes('ava-3'));
-		t.is(version, pkg.version);
-		return {
-			ava: {version: '3.0.0'},
-			identifier: 'ava-3',
-			normalizeGlobPatterns: patterns => patterns,
-			async findFiles({patterns}) {
-				return patterns.map(file => path.join(__dirname, file));
-			},
-			projectDir: __dirname
-		};
-	}
-}));
-
-const validateConfig = (t, provider, config) => {
-	const error = t.throws(() => provider.main({config}));
-	error.message = error.message.replace(`v${pkg.version}`, 'v${pkg.version}'); // eslint-disable-line no-template-curly-in-string
-	t.snapshot(error);
-};
-
-test('negotiates ava-3 protocol', withProvider, t => t.plan(2));
-
-test('main() config validation: throw when config is not a plain object', withProvider, (t, provider) => {
-	validateConfig(t, provider, false);
-	validateConfig(t, provider, true);
-	validateConfig(t, provider, null);
-	validateConfig(t, provider, []);
-});
-
-test('main() config validation: throw when config contains keys other than \'extensions\' or \'rewritePaths\'', withProvider, (t, provider) => {
-	validateConfig(t, provider, {foo: 1});
-});
-
-test('main() config validation: throw when config.extensions contains empty strings', withProvider, (t, provider) => {
-	validateConfig(t, provider, {extensions: ['']});
-});
-
-test('main() config validation: throw when config.extensions contains non-strings', withProvider, (t, provider) => {
-	validateConfig(t, provider, {extensions: [1]});
-});
-
-test('main() config validation: throw when config.extensions contains duplicates', withProvider, (t, provider) => {
-	validateConfig(t, provider, {extensions: ['ts', 'ts']});
-});
-
-test('main() config validation: config may not be an empty object', withProvider, (t, provider) => {
-	validateConfig(t, provider, {});
-});
-
-test('main() config validation: rewrite paths must end in a /', withProvider, (t, provider) => {
-	validateConfig(t, provider, {rewritePaths: {src: 'build/'}});
-	validateConfig(t, provider, {rewritePaths: {'src/': 'build'}});
-});
-
-test('main() extensions: defaults to [\'ts\']', withProvider, (t, provider) => {
-	t.deepEqual(provider.main({config: {rewritePaths: {'src/': 'build/'}}}).extensions, ['ts']);
-});
-
-test('main() extensions: returns configured extensions', withProvider, (t, provider) => {
-	const extensions = ['tsx'];
-	t.deepEqual(provider.main({config: {extensions, rewritePaths: {'src/': 'build/'}}}).extensions, extensions);
-});
-
-test('main() extensions: always returns new arrays', withProvider, (t, provider) => {
-	const main = provider.main({config: {rewritePaths: {'src/': 'build/'}}});
-	t.not(main.extensions, main.extensions);
-});
-
-const compile = async provider => {
-	return {
-		state: await provider.main({
-			config: {
-				rewritePaths: {
-					'typescript/': 'fixtures/'
-				}
-			}
-		}).compile()
-	};
-};
-
-test('worker(): load rewritten paths files', withProvider, async (t, provider) => {
-	const {state} = await compile(provider);
-	const {stdout, stderr} = await execa.node(
-		path.join(__dirname, 'fixtures/install-and-load'),
-		['ava-3', JSON.stringify(state), path.join(__dirname, 'typescript', 'file.ts')],
-		{cwd: path.join(__dirname, 'fixtures')}
-	);
-	if (stderr.length > 0) {
-		t.log(stderr);
-	}
-
-	t.snapshot(stdout);
-});
diff --git a/test/snapshots/compilation.js.md b/test/snapshots/compilation.js.md
new file mode 100644
index 0000000..1b54123
--- /dev/null
+++ b/test/snapshots/compilation.js.md
@@ -0,0 +1,24 @@
+# Snapshot report for `test/compilation.js`
+
+The actual snapshot is saved in `compilation.js.snap`.
+
+Generated by [AVA](https://avajs.dev).
+
+## worker(): load rewritten paths files
+
+> Snapshot 1
+
+    'logged in file.js'
+
+## worker(): runs compiled files
+
+> Snapshot 1
+
+    'logged in fixtures/typescript/index.ts'
+
+## compile() error
+
+> Snapshot 1
+
+    `Command failed with exit code 2: tsc --incremental␊
+    typescript/typescript.ts(1,1): error TS2304: Cannot find name 'a'.`
diff --git a/test/snapshots/compilation.js.snap b/test/snapshots/compilation.js.snap
new file mode 100644
index 0000000..1d4c4ed
Binary files /dev/null and b/test/snapshots/compilation.js.snap differ
diff --git a/test/snapshots/protocol-ava-3.2.js.md b/test/snapshots/protocol-ava-3.2.js.md
index 121606e..89878f9 100644
--- a/test/snapshots/protocol-ava-3.2.js.md
+++ b/test/snapshots/protocol-ava-3.2.js.md
@@ -4,6 +4,100 @@ The actual snapshot is saved in `protocol-ava-3.2.js.snap`.
 
 Generated by [AVA](https://avajs.dev).
 
+## main() config validation: throw when config is not a plain object
+
+> Snapshot 1
+
+    Error {
+      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+> Snapshot 2
+
+    Error {
+      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+> Snapshot 3
+
+    Error {
+      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+> Snapshot 4
+
+    Error {
+      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: throw when config contains keys other than 'extensions', 'rewritePaths' or 'compile'
+
+> Snapshot 1
+
+    Error {
+      message: 'Unexpected \'foo\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: throw when config.extensions contains empty strings
+
+> Snapshot 1
+
+    Error {
+      message: 'Missing \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: throw when config.extensions contains non-strings
+
+> Snapshot 1
+
+    Error {
+      message: 'Missing \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: throw when config.extensions contains duplicates
+
+> Snapshot 1
+
+    Error {
+      message: 'Missing \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: config may not be an empty object
+
+> Snapshot 1
+
+    Error {
+      message: 'Missing \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: throw when config.compile is invalid
+
+> Snapshot 1
+
+    Error {
+      message: 'Invalid \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+> Snapshot 2
+
+    Error {
+      message: 'Invalid \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+## main() config validation: rewrite paths must end in a /
+
+> Snapshot 1
+
+    Error {
+      message: 'Missing \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
+> Snapshot 2
+
+    Error {
+      message: 'Missing \'compile\' property in TypeScript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md',
+    }
+
 ## main() updateGlobs()
 
 > Snapshot 1
diff --git a/test/snapshots/protocol-ava-3.2.js.snap b/test/snapshots/protocol-ava-3.2.js.snap
index d5b6a0d..1e9982c 100644
Binary files a/test/snapshots/protocol-ava-3.2.js.snap and b/test/snapshots/protocol-ava-3.2.js.snap differ
diff --git a/test/snapshots/protocol-ava-3.js.md b/test/snapshots/protocol-ava-3.js.md
deleted file mode 100644
index 43ba7b2..0000000
--- a/test/snapshots/protocol-ava-3.js.md
+++ /dev/null
@@ -1,91 +0,0 @@
-# Snapshot report for `test/protocol-ava-3.js`
-
-The actual snapshot is saved in `protocol-ava-3.js.snap`.
-
-Generated by [AVA](https://avajs.dev).
-
-## main() config validation: config may not be an empty object
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## main() config validation: rewrite paths must end in a /
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-> Snapshot 2
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## main() config validation: throw when config contains keys other than 'extensions' or 'rewritePaths'
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## main() config validation: throw when config is not a plain object
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-> Snapshot 2
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-> Snapshot 3
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-> Snapshot 4
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## main() config validation: throw when config.extensions contains duplicates
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## main() config validation: throw when config.extensions contains empty strings
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## main() config validation: throw when config.extensions contains non-strings
-
-> Snapshot 1
-
-    Error {
-      message: 'Unexpected Typescript configuration for AVA. See https://github.com/avajs/typescript/blob/v${pkg.version}/README.md for allowed values.',
-    }
-
-## worker(): load rewritten paths files
-
-> Snapshot 1
-
-    'logged in file.js'
diff --git a/test/snapshots/protocol-ava-3.js.snap b/test/snapshots/protocol-ava-3.js.snap
deleted file mode 100644
index 35da63a..0000000
Binary files a/test/snapshots/protocol-ava-3.js.snap and /dev/null differ