no-eq-null.js
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/**
* @fileoverview Rule to flag comparisons to null without a type-checking
* operator.
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow `null` comparisons without type-checking operators",
category: "Best Practices",
recommended: false
},
schema: []
},
create(context) {
return {
BinaryExpression(node) {
const badOperator = node.operator === "==" || node.operator === "!=";
if (node.right.type === "Literal" && node.right.raw === "null" && badOperator ||
node.left.type === "Literal" && node.left.raw === "null" && badOperator) {
context.report({ node, message: "Use ‘===’ to compare with ‘null’." });
}
}
};
}
};