41 lines
1 KiB
JavaScript
41 lines
1 KiB
JavaScript
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/**
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* @fileoverview Rule to flag comparisons to the value NaN
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* @author James Allardice
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "require calls to `isNaN()` when checking for `NaN`",
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category: "Possible Errors",
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recommended: true,
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url: "https://eslint.org/docs/rules/use-isnan"
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},
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schema: [],
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messages: {
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useIsNaN: "Use the isNaN function to compare with NaN."
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}
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},
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create(context) {
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return {
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BinaryExpression(node) {
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if (/^(?:[<>]|[!=]=)=?$/u.test(node.operator) && (node.left.name === "NaN" || node.right.name === "NaN")) {
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context.report({ node, messageId: "useIsNaN" });
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}
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}
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};
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}
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};
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