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PR-URL: https://github.com/nodejs/io.js/pull/2072 Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com> Reviewed-by: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Alex Kocharin <alex@kocharin.ru>
30 lines
837 B
JavaScript
30 lines
837 B
JavaScript
/**
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* @fileoverview Rule to flag comparisons to null without a type-checking
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* operator.
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* @author Ian Christian Myers
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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 = function(context) {
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return {
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"BinaryExpression": function(node) {
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var badOperator = node.operator === "==" || node.operator === "!=";
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if (node.right.type === "Literal" && node.right.raw === "null" && badOperator ||
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node.left.type === "Literal" && node.left.raw === "null" && badOperator) {
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context.report(node, "Use ‘===’ to compare with ‘null’.");
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}
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}
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};
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};
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module.exports.schema = [];
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