[v13] chore: remove react 16 & 17 code (#1602)

* chore: remove React 16 & 17 code

chore: remove more

chore: react version 18.3.1

docs: migration guide

* refactor: finish merge

Author: mdjastrzebski

package.json

@@ -26,7 +26,6 @@
     "clean": "del build",
     "test": "jest",
     "test:ci": "jest --maxWorkers=2 --collectCoverage=true --coverage-provider=v8",
-    "test:react-17": "scripts/test_react_17",
     "typecheck": "tsc",
     "flow": "flow",
     "copy-flowtypes": "cp typings/index.flow.js build",
@@ -58,9 +57,9 @@
   },
   "peerDependencies": {
     "jest": ">=28.0.0",
-    "react": ">=16.8.0",
-    "react-native": ">=0.59",
-    "react-test-renderer": ">=16.8.0"
+    "react": ">=18.2.0",
+    "react-native": ">=0.73",
+    "react-test-renderer": ">=18.2.0"
   },
   "peerDependenciesMeta": {
     "jest": {

scripts/test_react_17

@@ -1,7 +1,6 @@
 // This file and the act() implementation is sourced from react-testing-library
 // https://github.com/testing-library/react-testing-library/blob/c80809a956b0b9f3289c4a6fa8b5e8cc72d6ef6d/src/act-compat.js
 import { act as reactTestRendererAct } from 'react-test-renderer';
-import { checkReactVersionAtLeast } from './react-versions';
 
 type ReactAct = typeof reactTestRendererAct;
 
@@ -72,9 +71,7 @@ function withGlobalActEnvironment(actImplementation: ReactAct) {
   };
 }
 
-const act: ReactAct = checkReactVersionAtLeast(18, 0)
-  ? (withGlobalActEnvironment(reactTestRendererAct) as ReactAct)
-  : reactTestRendererAct;
+const act = withGlobalActEnvironment(reactTestRendererAct) as ReactAct;
 
 export default act;
 export { setIsReactActEnvironment as setReactActEnvironment, getIsReactActEnvironment };

src/act.ts

@@ -1,8 +1,7 @@
 /* istanbul ignore file */
 
-import act, { getIsReactActEnvironment, setReactActEnvironment } from '../act';
+import { getIsReactActEnvironment, setReactActEnvironment } from '../act';
 import { flushMicroTasks } from '../flush-micro-tasks';
-import { checkReactVersionAtLeast } from '../react-versions';
 
 /**
  * Run given async callback with temporarily disabled `act` environment and flushes microtasks queue.
@@ -11,30 +10,15 @@ import { checkReactVersionAtLeast } from '../react-versions';
  * @returns Result of the callback
  */
 export async function wrapAsync<Result>(callback: () => Promise<Result>): Promise<Result> {
-  if (checkReactVersionAtLeast(18, 0)) {
-    const previousActEnvironment = getIsReactActEnvironment();
-    setReactActEnvironment(false);
+  const previousActEnvironment = getIsReactActEnvironment();
+  setReactActEnvironment(false);
 
-    try {
-      const result = await callback();
-      // Flush the microtask queue before restoring the `act` environment
-      await flushMicroTasks();
-      return result;
-    } finally {
-      setReactActEnvironment(previousActEnvironment);
-    }
+  try {
+    const result = await callback();
+    // Flush the microtask queue before restoring the `act` environment
+    await flushMicroTasks();
+    return result;
+  } finally {
+    setReactActEnvironment(previousActEnvironment);
   }
-
-  if (!checkReactVersionAtLeast(16, 9)) {
-    return callback();
-  }
-
-  // Wrapping with act for react version 16.9 to 17.x
-  let result: Result;
-  await act(async () => {
-    result = await callback();
-  });
-
-  // Either we have result or `callback` threw error
-  return result!;
 }

src/helpers/wrap-async.ts

@@ -13,6 +13,12 @@ Migration to React Native Testing Library version 13 from version 12.x.
 
 # Breaking changes
 
+## Supported React and React Native versions
+
+This version supports only React 19 and corresponding React Native versions. If you use React 18 or 19, please use latest of v12 versions.
+
+[Note: at the moment there is no React Native for React 19, and React 19 is still in beta, so we use React 18.3 for the time being].
+
 ## Removed deprecated \*ByAccessibilityState queries
 
 This deprecated query has been removed as is typically too general to give meaningful results. Use one of the following options: