Contents

/**
 * @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" });
                }
            }
        };

    }
};

Version data entries

71 entries across 61 versions & 3 rubygems

Version	Path
immosquare-cleaner-0.1.68	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.67	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.66	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.65	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.64	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.63	node_modules/eslint/lib/rules/no-eq-null.js
rapid_stack-0.2.0	templates/frontend/node_modules/eslint/lib/rules/no-eq-null.js
rapid_stack-0.1.1	templates/FrontEnd/node_modules/eslint/lib/rules/no-eq-null.js
rapid_stack-0.1.0	templates/FrontEnd/node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.62	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.61	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.60	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.59	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.58	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.57	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.56	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.55	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.54	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.53	node_modules/eslint/lib/rules/no-eq-null.js
immosquare-cleaner-0.1.52	node_modules/eslint/lib/rules/no-eq-null.js