diff --git a/package.json b/package.json
index ab820dc..447c140 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
 	"type": "module",
 	"exports": {
 		"types": "./index.d.ts",
-		"default": "./index.js"
+		"default": "./source/index.js"
 	},
 	"sideEffects": false,
 	"engines": {
@@ -23,10 +23,8 @@
 		"test": "xo && ava && tsc index.d.ts"
 	},
 	"files": [
-		"index.js",
-		"index.d.ts",
-		"iterable.js",
-		"windows.js"
+		"source/**/*.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"spawn",
diff --git a/index.js b/source/index.js
similarity index 100%
rename from index.js
rename to source/index.js
diff --git a/iterable.js b/source/iterable.js
similarity index 100%
rename from iterable.js
rename to source/iterable.js
diff --git a/pipe.js b/source/pipe.js
similarity index 100%
rename from pipe.js
rename to source/pipe.js
diff --git a/windows.js b/source/windows.js
similarity index 100%
rename from windows.js
rename to source/windows.js
diff --git a/fixtures/()[]%0!`.cmd b/test/fixtures/()[]%0!`.cmd
similarity index 100%
rename from fixtures/()[]%0!`.cmd
rename to test/fixtures/()[]%0!`.cmd
diff --git a/fixtures/echo-file.js b/test/fixtures/echo-file.js
similarity index 100%
rename from fixtures/echo-file.js
rename to test/fixtures/echo-file.js
diff --git a/fixtures/echo.js b/test/fixtures/echo.js
similarity index 100%
rename from fixtures/echo.js
rename to test/fixtures/echo.js
diff --git a/fixtures/node-flags-path.js b/test/fixtures/node-flags-path.js
similarity index 75%
rename from fixtures/node-flags-path.js
rename to test/fixtures/node-flags-path.js
index 75a1867..e99d6e9 100755
--- a/fixtures/node-flags-path.js
+++ b/test/fixtures/node-flags-path.js
@@ -1,5 +1,5 @@
 #!/usr/bin/env node
 import process from 'node:process';
-import nanoSpawn from '../index.js';
+import nanoSpawn from '../../source/index.js';
 
 await nanoSpawn(process.execPath, ['-p', 'process.execArgv'], {stdout: 'inherit'});
diff --git a/fixtures/node-flags.js b/test/fixtures/node-flags.js
similarity index 66%
rename from fixtures/node-flags.js
rename to test/fixtures/node-flags.js
index ba3ea1b..c85a756 100755
--- a/fixtures/node-flags.js
+++ b/test/fixtures/node-flags.js
@@ -1,4 +1,4 @@
 #!/usr/bin/env node
-import nanoSpawn from '../index.js';
+import nanoSpawn from '../../source/index.js';
 
 await nanoSpawn('node', ['-p', 'process.execArgv'], {stdout: 'inherit'});
diff --git a/fixtures/node-version.js b/test/fixtures/node-version.js
similarity index 63%
rename from fixtures/node-version.js
rename to test/fixtures/node-version.js
index fd36c20..3f80b76 100755
--- a/fixtures/node-version.js
+++ b/test/fixtures/node-version.js
@@ -1,4 +1,4 @@
 #!/usr/bin/env node
-import nanoSpawn from '../index.js';
+import nanoSpawn from '../../source/index.js';
 
 await nanoSpawn('node', ['--version'], {stdout: 'inherit'});
diff --git a/fixtures/shebang.js b/test/fixtures/shebang.js
similarity index 100%
rename from fixtures/shebang.js
rename to test/fixtures/shebang.js
diff --git a/fixtures/spawnecho.cmd b/test/fixtures/spawnecho.cmd
similarity index 100%
rename from fixtures/spawnecho.cmd
rename to test/fixtures/spawnecho.cmd
diff --git a/fixtures/test.js b/test/fixtures/test.js
similarity index 100%
rename from fixtures/test.js
rename to test/fixtures/test.js
diff --git a/fixtures/test.txt b/test/fixtures/test.txt
similarity index 100%
rename from fixtures/test.txt
rename to test/fixtures/test.txt
diff --git a/test.js b/test/index.js
similarity index 99%
rename from test.js
rename to test/index.js
index 25fba2d..8359894 100644
--- a/test.js
+++ b/test/index.js
@@ -10,7 +10,7 @@ import getNode from 'get-node';
 import pathKey from 'path-key';
 import {temporaryWriteTask} from 'tempy';
 import {red} from 'yoctocolors';
-import nanoSpawn from './index.js';
+import nanoSpawn from '../source/index.js';
 
 const isLinux = process.platform === 'linux';
 const isWindows = process.platform === 'win32';
@@ -1166,7 +1166,7 @@ const testLocalBinaryExec = async (t, cwd) => {
 };
 
 test('options.preferLocal true runs local npm binaries', testLocalBinaryExec, undefined);
-test('options.preferLocal true runs local npm binaries with options.cwd string', testLocalBinaryExec, './fixtures');
+test('options.preferLocal true runs local npm binaries with options.cwd string', testLocalBinaryExec, fixturesPath);
 test('options.preferLocal true runs local npm binaries with options.cwd URL', testLocalBinaryExec, FIXTURES_URL);
 
 if (!isWindows) {