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46 lines
1.2 KiB
46 lines
1.2 KiB
/** |
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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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/** @type {import('../shared/types').Rule} */ |
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module.exports = { |
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meta: { |
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type: "suggestion", |
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docs: { |
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description: "Disallow `null` comparisons without type-checking operators", |
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recommended: false, |
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url: "https://eslint.org/docs/rules/no-eq-null" |
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}, |
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schema: [], |
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messages: { |
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unexpected: "Use '===' to compare with null." |
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} |
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}, |
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create(context) { |
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return { |
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BinaryExpression(node) { |
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const 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, messageId: "unexpected" }); |
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} |
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} |
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}; |
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} |
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};
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