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Fix false positive lint error with large number of branches #24287

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merged 5 commits into from Apr 7, 2022
Merged

Fix false positive lint error with large number of branches #24287

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15ebafa
Switched RulesOfHooks.js to use BigInt. Added test and updated .eslin…
Apr 6, 2022
9db455a
Added BigInt as readonly global in eslintrc.cjs.js and eslintrc.cjs20…
Apr 7, 2022
bee57d9
Added comment to RulesOfHooks.js that gets rid of BigInt eslint error
Apr 7, 2022
89c4cf6
Got rid of changes in .eslintrc.js and yarn.lock
Apr 7, 2022
8797f17
Move global down
gaearon Apr 7, 2022
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69 changes: 69 additions & 0 deletions packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js
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Expand Up @@ -325,6 +325,75 @@ const tests = {
useHook();
}
`,
`
// Valid because the neither the conditions before or after the hook affect the hook call
// Failed prior to implementing BigInt because pathsFromStartToEnd and allPathsFromStartToEnd were too big and had rounding errors
const useSomeHook = () => {};
const SomeName = () => {
const filler = FILLER ?? FILLER ?? FILLER;
const filler2 = FILLER ?? FILLER ?? FILLER;
const filler3 = FILLER ?? FILLER ?? FILLER;
const filler4 = FILLER ?? FILLER ?? FILLER;
const filler5 = FILLER ?? FILLER ?? FILLER;
const filler6 = FILLER ?? FILLER ?? FILLER;
const filler7 = FILLER ?? FILLER ?? FILLER;
const filler8 = FILLER ?? FILLER ?? FILLER;
useSomeHook();
if (anyConditionCanEvenBeFalse) {
return null;
}
return (
<React.Fragment>
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
{FILLER ? FILLER : FILLER}
</React.Fragment>
);
};
`,
`
// Valid because the neither the condition nor the loop affect the hook call.
function App(props) {
Expand Down
19 changes: 10 additions & 9 deletions packages/eslint-plugin-react-hooks/src/RulesOfHooks.js
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Expand Up @@ -5,6 +5,7 @@
* LICENSE file in the root directory of this source tree.
*/

/* global BigInt */
/* eslint-disable no-for-of-loops/no-for-of-loops */

'use strict';
Expand Down Expand Up @@ -175,7 +176,7 @@ export default {
cyclic.add(cyclicSegment);
}

return 0;
return BigInt('0');
}

// add the current segment to pathList
Expand All @@ -187,19 +188,19 @@ export default {
}

if (codePath.thrownSegments.includes(segment)) {
paths = 0;
paths = BigInt('0');
} else if (segment.prevSegments.length === 0) {
paths = 1;
paths = BigInt('1');
} else {
paths = 0;
paths = BigInt('0');
for (const prevSegment of segment.prevSegments) {
paths += countPathsFromStart(prevSegment, pathList);
}
}

// 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) {
if (segment.reachable && paths === BigInt('0')) {
cache.delete(segment.id);
} else {
cache.set(segment.id, paths);
Expand Down Expand Up @@ -246,7 +247,7 @@ export default {
cyclic.add(cyclicSegment);
}

return 0;
return BigInt('0');
}

// add the current segment to pathList
Expand All @@ -258,11 +259,11 @@ export default {
}

if (codePath.thrownSegments.includes(segment)) {
paths = 0;
paths = BigInt('0');
} else if (segment.nextSegments.length === 0) {
paths = 1;
paths = BigInt('1');
} else {
paths = 0;
paths = BigInt('0');
for (const nextSegment of segment.nextSegments) {
paths += countPathsToEnd(nextSegment, pathList);
}
Expand Down
1 change: 1 addition & 0 deletions scripts/rollup/validate/eslintrc.cjs.js
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Expand Up @@ -7,6 +7,7 @@ module.exports = {
},
globals: {
// ES 6
BigInt: 'readonly',
Map: 'readonly',
Set: 'readonly',
Proxy: 'readonly',
Expand Down
1 change: 1 addition & 0 deletions scripts/rollup/validate/eslintrc.cjs2015.js
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Expand Up @@ -7,6 +7,7 @@ module.exports = {
},
globals: {
// ES 6
BigInt: 'readonly',
Map: 'readonly',
Set: 'readonly',
Proxy: 'readonly',
Expand Down