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Fix issue with multiple code branches in hooks linter #14661

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Merged
merged 4 commits into from
Jan 25, 2019
Merged

Fix issue with multiple code branches in hooks linter #14661

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cb1e8a5
Fix issue with multiple code branches
Yurickh Jan 23, 2019
d3ad6e5
Add solution by @calebmer
Yurickh Jan 24, 2019
8928f8a
Add performance test
Yurickh Jan 24, 2019
0ad2940
Undo unrelated change
gaearon Jan 25, 2019
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69 changes: 69 additions & 0 deletions packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -270,6 +270,75 @@ eslintTester.run('react-hooks', ReactHooksESLintRule, {
useState();
}
`,
`
// Valid because the loop doesn't change the order of hooks calls.
function RegressionTest() {
const res = [];
const additionalCond = true;
for (let i = 0; i !== 10 && additionalCond; ++i ) {
res.push(i);
}
React.useLayoutEffect(() => {});
}
`,
`
// Is valid but hard to compute by brute-forcing
function MyComponent() {
// 40 conditions
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}
if (c) {} else {}

// 10 hooks
useHook();
useHook();
useHook();
useHook();
useHook();
useHook();
useHook();
useHook();
useHook();
useHook();
}
`,
],
invalid: [
{
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9 changes: 8 additions & 1 deletion packages/eslint-plugin-react-hooks/src/RulesOfHooks.js
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Original file line number Diff line number Diff line change
Expand Up @@ -149,7 +149,14 @@ export default {
paths += countPathsFromStart(prevSegment);
}
}
cache.set(segment.id, paths);

// If our segment is reachable then there should be at least one path
// to it from the start of our code path.
if (segment.reachable && paths === 0) {
cache.delete(segment.id);
} else {
cache.set(segment.id, paths);
}

return paths;
}
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