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Dir : ~/var/www/invoice/node_modules/eslint/lib/rules/

Edit File: no-dupe-args.js

/**
 * @fileoverview Rule to flag duplicate arguments
 * @author Jamund Ferguson
 */

"use strict";

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

module.exports = {
    meta: {
        type: "problem",

docs: {
            description: "disallow duplicate arguments in `function` definitions",
            category: "Possible Errors",
            recommended: true,
            url: "https://eslint.org/docs/rules/no-dupe-args"
        },

schema: [],

messages: {
            unexpected: "Duplicate param '{{name}}'."
        }
    },

create(context) {

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

/**
         * Checks whether or not a given definition is a parameter's.
         * @param {eslint-scope.DefEntry} def A definition to check.
         * @returns {boolean} `true` if the definition is a parameter's.
         */
        function isParameter(def) {
            return def.type === "Parameter";
        }

/**
         * Determines if a given node has duplicate parameters.
         * @param {ASTNode} node The node to check.
         * @returns {void}
         * @private
         */
        function checkParams(node) {
            const variables = context.getDeclaredVariables(node);

for (let i = 0; i < variables.length; ++i) {
                const variable = variables[i];

// Checks and reports duplications.
                const defs = variable.defs.filter(isParameter);

if (defs.length >= 2) {
                    context.report({
                        node,
                        messageId: "unexpected",
                        data: { name: variable.name }
                    });
                }
            }
        }

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

return {
            FunctionDeclaration: checkParams,
            FunctionExpression: checkParams
        };

}
};