feat: automatically call "cleanup" after each test

...if an "afterEach" global function is defined, and process.env.RTL_SKIP_AUTO_CLEANUP is falsy.

Taken from: https://github.com/testing-library/react-testing-library/blob/14670debd45236d2c5d0a61a83dadc72af1bef7c/src/index.js

Author: aleclarson

src/index.js

@@ -1,20 +1,16 @@
-// @flow
-import act from './act';
-import cleanup from './cleanup';
-import debug from './debug';
-import fireEvent from './fireEvent';
 import flushMicrotasksQueue from './flushMicrotasksQueue';
-import render from './render';
-import shallow from './shallow';
-import waitForElement from './waitForElement';
-import within from './within';
+import { cleanup } from './pure';
 
-export { act };
-export { cleanup };
-export { debug };
-export { fireEvent };
-export { flushMicrotasksQueue };
-export { render };
-export { shallow };
-export { waitForElement };
-export { within };
+// if we're running in a test runner that supports afterEach
+// then we'll automatically run cleanup afterEach test
+// this ensures that tests run in isolation from each other
+// if you don't like this then either import the `pure` module
+// or set the RTL_SKIP_AUTO_CLEANUP env variable to 'true'.
+if (typeof afterEach === 'function' && !process.env.RTL_SKIP_AUTO_CLEANUP) {
+  afterEach(async () => {
+    await flushMicrotasksQueue();
+    cleanup();
+  });
+}
+
+export * from './pure';

src/pure.js

@@ -0,0 +1,18 @@
+// @flow
+import act from './act';
+import cleanup from './cleanup';
+import debug from './debug';
+import fireEvent from './fireEvent';
+import flushMicrotasksQueue from './flushMicrotasksQueue';
+import render from './render';
+import shallow from './shallow';
+import waitForElement from './waitForElement';
+
+export { act };
+export { cleanup };
+export { debug };
+export { fireEvent };
+export { flushMicrotasksQueue };
+export { render };
+export { shallow };
+export { waitForElement };