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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: { | |
| type: "suggestion", | |
| docs: { | |
| description: "disallow `null` comparisons without type-checking operators", | |
| category: "Best Practices", | |
| recommended: false, | |
| url: "https://eslint.org/docs/rules/no-eq-null" | |
| }, | |
| schema: [], | |
| messages: { | |
| unexpected: "Use '===' to compare with null." | |
| } | |
| }, | |
| 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, messageId: "unexpected" }); | |
| } | |
| } | |
| }; | |
| } | |
| }; |