charlike
Version:
Small, fast, simple and streaming project scaffolder for myself, but not only. Supports hundreds of template engines through the @JSTransformers API or if you want custom `render` function passed through options
35 lines (27 loc) • 870 B
JavaScript
/**
* @fileoverview Rule to flag comparisons to the value NaN
* @author James Allardice
*/
;
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require calls to `isNaN()` when checking for `NaN`",
category: "Possible Errors",
recommended: true
},
schema: []
},
create(context) {
return {
BinaryExpression(node) {
if (/^(?:[<>]|[!=]=)=?$/.test(node.operator) && (node.left.name === "NaN" || node.right.name === "NaN")) {
context.report(node, "Use the isNaN function to compare with NaN.");
}
}
};
}
};