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