[eslint-plugin-react-hooks] Add ESLint v10 support (#35720)

## Summary

ESLint v10.0.0 was released on February 7, 2026. The current
`peerDependencies` for `eslint-plugin-react-hooks` only allows up to
`^9.0.0`, which causes peer dependency warnings when installing with
ESLint v10.

This PR:

- Adds `^10.0.0` to the eslint peer dependency range
- Adds `eslint-v10` to devDependencies for testing
- Adds an `eslint-v10` e2e fixture (based on the existing `eslint-v9`
fixture)

ESLint v10's main breaking changes (removal of legacy eslintrc config,
deprecated context methods) don't affect this plugin - flat config is
already supported since v7.0.0, and the deprecated APIs already have
fallbacks in place.

## How did you test this change?

Ran the existing unit test suite:

```
cd packages/eslint-plugin-react-hooks && yarn test
```

All 5082 tests passed.

.github/workflows/runtime_eslint_plugin_e2e.yml

@@ -29,6 +29,7 @@ jobs:
           - "7"
           - "8"
           - "9"
+          - "10"
     steps:
       - uses: actions/checkout@v4
         with:

fixtures/eslint-v10/README.md

@@ -0,0 +1,12 @@
+# ESLint v10 Fixture
+
+This fixture allows us to test e2e functionality for `eslint-plugin-react-hooks` with eslint version 10.
+
+Run the following to test.
+
+```sh
+cd fixtures/eslint-v10
+yarn
+yarn build
+yarn lint
+```

fixtures/eslint-v10/build.mjs

@@ -0,0 +1,13 @@
+#!/usr/bin/env node
+
+import {execSync} from 'node:child_process';
+import {dirname, resolve} from 'node:path';
+import {fileURLToPath} from 'node:url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+execSync('yarn build -r stable eslint-plugin-react-hooks', {
+  cwd: resolve(__dirname, '..', '..'),
+  stdio: 'inherit',
+});

fixtures/eslint-v10/eslint.config.ts

@@ -0,0 +1,20 @@
+import {defineConfig} from 'eslint/config';
+import reactHooks from 'eslint-plugin-react-hooks';
+
+export default defineConfig([
+  reactHooks.configs.flat['recommended-latest'],
+  {
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+    },
+    rules: {
+      'react-hooks/exhaustive-deps': 'error',
+    },
+  },
+]);

fixtures/eslint-v10/index.js

@@ -0,0 +1,182 @@
+/**
+ * Exhaustive Deps
+ */
+// Valid because dependencies are declared correctly
+function Comment({comment, commentSource}) {
+  const currentUserID = comment.viewer.id;
+  const environment = RelayEnvironment.forUser(currentUserID);
+  const commentID = nullthrows(comment.id);
+  useEffect(() => {
+    const subscription = SubscriptionCounter.subscribeOnce(
+      `StoreSubscription_${commentID}`,
+      () =>
+        StoreSubscription.subscribe(
+          environment,
+          {
+            comment_id: commentID,
+          },
+          currentUserID,
+          commentSource
+        )
+    );
+    return () => subscription.dispose();
+  }, [commentID, commentSource, currentUserID, environment]);
+}
+
+// Valid because no dependencies
+function UseEffectWithNoDependencies() {
+  const local = {};
+  useEffect(() => {
+    console.log(local);
+  });
+}
+function UseEffectWithEmptyDependencies() {
+  useEffect(() => {
+    const local = {};
+    console.log(local);
+  }, []);
+}
+
+// OK because `props` wasn't defined.
+function ComponentWithNoPropsDefined() {
+  useEffect(() => {
+    console.log(props.foo);
+  }, []);
+}
+
+// Valid because props are declared as a dependency
+function ComponentWithPropsDeclaredAsDep({foo}) {
+  useEffect(() => {
+    console.log(foo.length);
+    console.log(foo.slice(0));
+  }, [foo]);
+}
+
+// Valid because individual props are declared as dependencies
+function ComponentWithIndividualPropsDeclaredAsDeps(props) {
+  useEffect(() => {
+    console.log(props.foo);
+    console.log(props.bar);
+  }, [props.bar, props.foo]);
+}
+
+// Invalid because neither props or props.foo are declared as dependencies
+function ComponentWithoutDeclaringPropAsDep(props) {
+  useEffect(() => {
+    console.log(props.foo);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  useCallback(() => {
+    console.log(props.foo);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  // eslint-disable-next-line react-hooks/void-use-memo
+  useMemo(() => {
+    console.log(props.foo);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  React.useEffect(() => {
+    console.log(props.foo);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  React.useCallback(() => {
+    console.log(props.foo);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  // eslint-disable-next-line react-hooks/void-use-memo
+  React.useMemo(() => {
+    console.log(props.foo);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  React.notReactiveHook(() => {
+    console.log(props.foo);
+  }, []); // This one isn't a violation
+}
+
+/**
+ * Rules of Hooks
+ */
+// Valid because functions can call functions.
+function normalFunctionWithConditionalFunction() {
+  if (cond) {
+    doSomething();
+  }
+}
+
+// Valid because hooks can call hooks.
+function useHook() {
+  useState();
+}
+const whatever = function useHook() {
+  useState();
+};
+const useHook1 = () => {
+  useState();
+};
+let useHook2 = () => useState();
+useHook2 = () => {
+  useState();
+};
+
+// Invalid because hooks can't be called in conditionals.
+function ComponentWithConditionalHook() {
+  if (cond) {
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    useConditionalHook();
+  }
+}
+
+// Invalid because hooks can't be called in loops.
+function useHookInLoops() {
+  while (a) {
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    useHook1();
+    if (b) return;
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    useHook2();
+  }
+  while (c) {
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    useHook3();
+    if (d) return;
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    useHook4();
+  }
+}
+
+/**
+ * Compiler Rules
+ */
+// Invalid: component factory
+function InvalidComponentFactory() {
+  const DynamicComponent = () => <div>Hello</div>;
+  // eslint-disable-next-line react-hooks/static-components
+  return <DynamicComponent />;
+}
+
+// Invalid: mutating globals
+function InvalidGlobals() {
+  // eslint-disable-next-line react-hooks/immutability
+  window.myGlobal = 42;
+  return <div>Done</div>;
+}
+
+// Invalid: useMemo with wrong deps
+function InvalidUseMemo({items}) {
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const sorted = useMemo(() => [...items].sort(), []);
+  return <div>{sorted.length}</div>;
+}
+
+// Invalid: missing/extra deps in useEffect
+function InvalidEffectDeps({a, b}) {
+  useEffect(() => {
+    console.log(a);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  useEffect(() => {
+    console.log(a);
+    // TODO: eslint-disable-next-line react-hooks/exhaustive-effect-dependencies
+  }, [a, b]);
+}

fixtures/eslint-v10/package.json

@@ -0,0 +1,16 @@
+{
+  "private": true,
+  "name": "eslint-v10",
+  "dependencies": {
+    "eslint": "^10.0.0",
+    "eslint-plugin-react-hooks": "link:../../build/oss-stable/eslint-plugin-react-hooks",
+    "jiti": "^2.4.2"
+  },
+  "scripts": {
+    "build": "node build.mjs && yarn",
+    "lint": "tsc --noEmit && eslint index.js --report-unused-disable-directives"
+  },
+  "devDependencies": {
+    "typescript": "^5.4.3"
+  }
+}

fixtures/eslint-v10/tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "lib": [
+      "es2022"
+    ],
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
+    "target": "es2022",
+    "typeRoots": [
+      "./node_modules/@types"
+    ],
+    "skipLibCheck": true
+  },
+  "exclude": [
+    "node_modules",
+    "**/node_modules",
+    "../node_modules",
+    "../../node_modules"
+  ]
+}

packages/eslint-plugin-react-hooks/package.json

@@ -36,7 +36,7 @@
   },
   "homepage": "https://react.dev/",
   "peerDependencies": {
-    "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0"
+    "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0 || ^10.0.0"
   },
   "dependencies": {
     "@babel/core": "^7.24.4",