| 1 | /**
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| 2 | * @fileoverview Rule to flag comparisons to null without a type-checking
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| 3 | * operator.
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| 4 | * @author Ian Christian Myers
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| 5 | */
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| 6 |
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| 7 | //------------------------------------------------------------------------------
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| 8 | // Rule Definition
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| 9 | //------------------------------------------------------------------------------
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| 10 |
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| 11 | module.exports = function(context) {
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| 12 | ;
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| 13 |
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| 14 | return {
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| 15 |
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| 16 | "BinaryExpression": function(node) {
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| 17 | var badOperator = node.operator === "==" || node.operator === "!=";
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| 18 |
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| 19 | if (node.right.type === "Literal" && node.right.raw === "null" && badOperator ||
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| 20 | node.left.type === "Literal" && node.left.raw === "null" && badOperator) {
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| 21 | context.report(node, "Use ‘===’ to compare with ‘null’.");
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| 22 | }
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| 23 | }
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| 24 | };
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| 25 |
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| 26 | };
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