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fix: use-isnan doesn't report on SequenceExpressions #18059

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merged 7 commits into from Feb 6, 2024
Merged

fix: use-isnan doesn't report on SequenceExpressions #18059

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9f9afd5
fix: `use-isnan` doesn't report on `SequenceExpression`s
StyleShit Jan 31, 2024
c528495
kinda docs?
StyleShit Jan 31, 2024
1fde508
Merge branch 'main' into fix/use-isnan-sequence-expression
amareshsm Feb 1, 2024
25c37eb
fix suggestions
StyleShit Feb 1, 2024
20cb687
more cases
StyleShit Feb 1, 2024
fc98c02
Merge remote-tracking branch 'eslint/main' into fix/use-isnan-sequenc…
StyleShit Feb 5, 2024
172657c
fix tests
StyleShit Feb 5, 2024
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14 changes: 11 additions & 3 deletions lib/rules/use-isnan.js
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Expand Up @@ -21,9 +21,17 @@ const astUtils = require("./utils/ast-utils");
* @returns {boolean} `true` if the node is 'NaN' identifier.
*/
function isNaNIdentifier(node) {
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return Boolean(node) && (
astUtils.isSpecificId(node, "NaN") ||
astUtils.isSpecificMemberAccess(node, "Number", "NaN")
if (!node) {
return false;
}

const nodeToCheck = node.type === "SequenceExpression"
? node.expressions.at(-1)
: node;

return (
astUtils.isSpecificId(nodeToCheck, "NaN") ||
astUtils.isSpecificMemberAccess(nodeToCheck, "Number", "NaN")
);
}

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28 changes: 28 additions & 0 deletions tests/lib/rules/use-isnan.js
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Expand Up @@ -183,6 +183,10 @@ ruleTester.run("use-isnan", rule, {
"foo.lastIndexOf(NaN)",
"foo.indexOf(Number.NaN)",
"foo.lastIndexOf(Number.NaN)",
"foo.indexOf((NaN, 1))",
"foo.lastIndexOf((NaN, 1))",
"foo.indexOf((Number.NaN, 1))",
"foo.lastIndexOf((Number.NaN, 1))",
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{
code: "foo.indexOf(NaN)",
options: [{}]
Expand Down Expand Up @@ -1010,6 +1014,30 @@ ruleTester.run("use-isnan", rule, {
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 2020 },
errors: [{ messageId: "indexOfNaN", data: { methodName: "indexOf" } }]
},
{
code: "foo.indexOf((1, NaN))",
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 2020 },
errors: [{ messageId: "indexOfNaN", data: { methodName: "indexOf" } }]
},
{
code: "foo.indexOf((1, Number.NaN))",
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 2020 },
errors: [{ messageId: "indexOfNaN", data: { methodName: "indexOf" } }]
},
{
code: "foo.lastIndexOf((1, NaN))",
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 2020 },
errors: [{ messageId: "indexOfNaN", data: { methodName: "lastIndexOf" } }]
},
{
code: "foo.lastIndexOf((1, Number.NaN))",
options: [{ enforceForIndexOf: true }],
languageOptions: { ecmaVersion: 2020 },
errors: [{ messageId: "indexOfNaN", data: { methodName: "lastIndexOf" } }]
}
]
});