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‎docs/config.json

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@@ -306,6 +306,10 @@
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{
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"label": "Prefer object syntax",
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"to": "react/eslint/prefer-query-object-syntax"
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},
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{
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"label": "Stable Query Client",
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"to": "react/eslint/stable-query-client"
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}
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]
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},

‎docs/react/eslint/eslint-plugin-query.md

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@@ -33,7 +33,8 @@ Then configure the rules you want to use under the rules section:
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{
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"rules": {
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"@tanstack/query/exhaustive-deps": "error",
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"@tanstack/query/prefer-query-object-syntax": "error"
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"@tanstack/query/prefer-query-object-syntax": "error",
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"@tanstack/query/stable-query-client": "error"
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}
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}
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```

‎docs/react/eslint/stable-query-client.md

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---
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id: stable-query-client
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title: Stable Query Client
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---
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The QueryClient contains the QueryCache, so you'd only want to create one instance of the QueryClient for the lifecycle of your application - _not_ a new instance on every render.
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> Exception: It's allowed to create a new QueryClient inside an async Server Component, because the async function is only called once on the server.
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## Rule Details
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Examples of **incorrect** code for this rule:
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```tsx
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/* eslint "@tanstack/query/stable-query-client": "error" */
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function App() {
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const queryClient = new QueryClient()
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return (
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<QueryClientProvider client={queryClient}>
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<Home />
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</QueryClientProvider>
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)
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}
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```
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Examples of **correct** code for this rule:
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```tsx
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function App() {
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const [queryClient] = useState(() => new QueryClient())
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return (
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<QueryClientProvider client={queryClient}>
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<Home />
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</QueryClientProvider>
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)
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}
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```
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```tsx
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const queryClient = new QueryClient()
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function App() {
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return (
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<QueryClientProvider client={queryClient}>
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<Home />
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</QueryClientProvider>
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)
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}
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```
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```
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async function App() {
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const queryClient = new QueryClient()
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await queryClient.prefetchQuery(options)
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}
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```
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## Attributes
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- [x] ✅ Recommended
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- [x] 🔧 Fixable

‎packages/eslint-plugin-query/package.json

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{
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"name": "@tanstack/eslint-plugin-query",
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"version": "4.34.1",
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"version": "4.36.0",
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"description": "ESLint plugin for TanStack Query",
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"author": "Eliya Cohen",
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"license": "MIT",

‎packages/eslint-plugin-query/src/configs/index.test.ts

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"rules": {
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"@tanstack/query/exhaustive-deps": "error",
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"@tanstack/query/prefer-query-object-syntax": "error",
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"@tanstack/query/stable-query-client": "error",
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},
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},
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}

‎packages/eslint-plugin-query/src/rules/index.ts

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import * as exhaustiveDeps from './exhaustive-deps/exhaustive-deps.rule'
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import * as preferObjectSyntax from './prefer-query-object-syntax/prefer-query-object-syntax'
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import * as stableQueryClient from './stable-query-client/stable-query-client.rule'
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export const rules = {
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[exhaustiveDeps.name]: exhaustiveDeps.rule,
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[preferObjectSyntax.name]: preferObjectSyntax.rule,
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[stableQueryClient.name]: stableQueryClient.rule,
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}

‎packages/eslint-plugin-query/src/rules/stable-query-client/stable-query-client.rule.ts

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import { AST_NODE_TYPES } from '@typescript-eslint/utils'
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import { ASTUtils } from '../../utils/ast-utils'
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import { createRule } from '../../utils/create-rule'
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import type { TSESLint } from '@typescript-eslint/utils'
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export const name = 'stable-query-client'
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export const rule = createRule({
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name,
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meta: {
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type: 'problem',
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docs: {
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description: 'Makes sure that QueryClient is stable',
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recommended: 'error',
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},
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messages: {
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unstable: [
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'QueryClient is not stable. It should be either extracted from the component or wrapped in React.useState.',
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'See https://tkdodo.eu/blog/react-query-fa-qs#2-the-queryclient-is-not-stable',
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].join('\n'),
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fixTo: 'Fix to {{result}}',
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},
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hasSuggestions: true,
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fixable: 'code',
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schema: [],
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},
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defaultOptions: [],
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create(context, _, helpers) {
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return {
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NewExpression(node) {
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if (
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node.callee.type !== AST_NODE_TYPES.Identifier ||
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node.callee.name !== 'QueryClient' ||
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node.parent?.type !== AST_NODE_TYPES.VariableDeclarator ||
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!helpers.isSpecificTanstackQueryImport(
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node.callee,
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'@tanstack/react-query',
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)
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) {
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return
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}
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const fnAncestor = ASTUtils.getFunctionAncestor(context)
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const isReactServerComponent = fnAncestor?.async === true
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if (
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!ASTUtils.isValidReactComponentOrHookName(fnAncestor?.id) ||
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isReactServerComponent
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) {
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return
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}
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context.report({
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node: node.parent,
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messageId: 'unstable',
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fix: (() => {
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const { parent } = node
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if (parent.id.type !== AST_NODE_TYPES.Identifier) {
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return
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}
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const nodeText = context.getSourceCode().getText(node)
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const variableName = parent.id.name
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return (fixer: TSESLint.RuleFixer) => {
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return fixer.replaceTextRange(
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[parent.range[0], parent.range[1]],
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`[${variableName}] = React.useState(() => ${nodeText})`,
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)
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}
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})(),
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})
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},
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}
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},
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})

‎packages/eslint-plugin-query/src/rules/stable-query-client/stable-query-client.test.ts

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import { ESLintUtils } from '@typescript-eslint/utils'
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import { normalizeIndent } from '../../utils/test-utils'
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import { rule } from './stable-query-client.rule'
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const ruleTester = new ESLintUtils.RuleTester({
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parser: '@typescript-eslint/parser',
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settings: {},
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})
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ruleTester.run('stable-query-client', rule, {
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valid: [
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{
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name: 'QueryClient is stable when wrapped in React.useState',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [queryClient] = React.useState(() => new QueryClient());
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return;
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}
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`,
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},
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{
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name: 'QueryClient is stable when wrapped in useState',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [queryClient] = useState(() => new QueryClient());
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return;
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}
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`,
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},
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{
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name: 'QueryClient is stable when wrapped in React.useMemo',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [queryClient] = React.useMemo(() => new QueryClient(), []);
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return;
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}
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`,
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},
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{
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name: 'QueryClient is stable when wrapped in useAnything',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [queryClient] = useAnything(() => new QueryClient());
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return;
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}
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`,
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},
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{
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name: 'QueryClient is imported from a non-tanstack package',
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code: normalizeIndent`
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import { QueryClient } from "other-library";
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function Component() {
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const queryClient = new QueryClient();
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return;
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}
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`,
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},
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{
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name: 'QueryClient is not imported from @tanstack/react-query',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/solid-query";
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function Component() {
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const queryClient = new QueryClient();
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return;
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}
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`,
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},
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{
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name: 'QueryClient is invoked outside of a function',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/solid-query";
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const queryClient = new QueryClient();
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function Component() {
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return;
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}
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`,
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},
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{
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name: 'QueryClient is invoked in a non-component function',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/solid-query";
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function someFn() {
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const queryClient = new QueryClient();
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return;
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}
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`,
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},
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{
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name: 'QueryClient is invoked in an async (react server) component',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/solid-query";
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async function AsyncComponent() {
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const queryClient = new QueryClient();
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return;
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}
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`,
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},
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],
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invalid: [
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{
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name: 'QueryClient is not stable when it is not wrapped in React.useState in component',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const queryClient = new QueryClient();
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return;
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}
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`,
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output: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [queryClient] = React.useState(() => new QueryClient());
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return;
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}
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`,
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errors: [{ messageId: 'unstable' }],
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},
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{
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name: 'QueryClient is not stable when it is not wrapped in React.useState in custom hook',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function useHook() {
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const queryClient = new QueryClient();
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return;
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}
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`,
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output: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function useHook() {
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const [queryClient] = React.useState(() => new QueryClient());
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return;
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}
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`,
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errors: [{ messageId: 'unstable' }],
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},
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{
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name: 'preserve QueryClient options',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const queryClient = new QueryClient({ defaultOptions: { /* */ } });
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return;
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}
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`,
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output: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [queryClient] = React.useState(() => new QueryClient({ defaultOptions: { /* */ } }));
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return;
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}
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`,
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errors: [{ messageId: 'unstable' }],
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},
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{
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name: 'preserve QueryClient variable declarator name',
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code: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const customName = new QueryClient();
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return;
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}
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`,
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output: normalizeIndent`
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import { QueryClient } from "@tanstack/react-query";
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function Component() {
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const [customName] = React.useState(() => new QueryClient());
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return;
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}
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`,
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errors: [{ messageId: 'unstable' }],
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},
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],
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})

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