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Allow useEffect(fn, undefined) in react-hooks/exhaustive-deps. #27525

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merged 1 commit into from
Nov 1, 2023
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Allow useEffect(fn, undefined) in react-hooks/exhaustive-deps. #27525

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9 changes: 9 additions & 0 deletions packages/eslint-plugin-react-hooks/__tests__/ESLintRuleExhaustiveDeps-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1452,6 +1452,15 @@ const tests = {
}
`,
},
{
code: normalizeIndent`
function MyComponent() {
useEffect(() => {
console.log('banana banana banana');
}, undefined);
}
`,
},
],
invalid: [
{
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7 changes: 6 additions & 1 deletion packages/eslint-plugin-react-hooks/src/ExhaustiveDeps.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1161,7 +1161,12 @@ export default {
const callback = node.arguments[callbackIndex];
const reactiveHook = node.callee;
const reactiveHookName = getNodeWithoutReactNamespace(reactiveHook).name;
const declaredDependenciesNode = node.arguments[callbackIndex + 1];
const maybeNode = node.arguments[callbackIndex + 1];
const declaredDependenciesNode =
maybeNode &&
!(maybeNode.type === 'Identifier' && maybeNode.name === 'undefined')
? maybeNode
: undefined;
const isEffect = /Effect($|[^a-z])/g.test(reactiveHookName);

// Check whether a callback is supplied. If there is no callback supplied
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