47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
/**
|
|
* @fileoverview Rule to flag comparisons to null without a type-checking
|
|
* operator.
|
|
* @author Ian Christian Myers
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
type: "suggestion",
|
|
|
|
docs: {
|
|
description: "Disallow `null` comparisons without type-checking operators",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/latest/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" });
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
};
|