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Viewing file:     no-label-var.js (2.36 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag labels that are the same as an identifier
 * @author Ian Christian Myers
 */

"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const astUtils = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../shared/types').Rule} */
module.exports = {
    meta: {
        type: "suggestion",

        docs: {
            description: "Disallow labels that share a name with a variable",
            recommended: false,
            url: "https://eslint.org/docs/latest/rules/no-label-var"
        },

        schema: [],

        messages: {
            identifierClashWithLabel: "Found identifier with same name as label."
        }
    },

    create(context) {
        const sourceCode = context.sourceCode;

        //--------------------------------------------------------------------------
        // Helpers
        //--------------------------------------------------------------------------

        /**
         * Check if the identifier is present inside current scope
         * @param {Object} scope current scope
         * @param {string} name To evaluate
         * @returns {boolean} True if its present
         * @private
         */
        function findIdentifier(scope, name) {
            return astUtils.getVariableByName(scope, name) !== null;
        }

        //--------------------------------------------------------------------------
        // Public API
        //--------------------------------------------------------------------------

        return {

            LabeledStatement(node) {

                // Fetch the innermost scope.
                const scope = sourceCode.getScope(node);

                /*
                 * Recursively find the identifier walking up the scope, starting
                 * with the innermost scope.
                 */
                if (findIdentifier(scope, node.label.name)) {
                    context.report({
                        node,
                        messageId: "identifierClashWithLabel"
                    });
                }
            }

        };

    }
};