@maniascript/mslint/dist/lib/rules/no-dupe-parameters.js

ManiaScript linter

import {} from '../linter/rule.js';
import { FunctionDeclaration } from '@maniascript/parser';
export const noDupeParameters = {
    meta: {
        id: 'no-dupe-parameters',
        description: 'Forbid duplicate parameters in function definitions',
        recommended: true
    },
    create(context) {
        return {
            'FunctionDeclaration:exit': (node) => {
                if (node instanceof FunctionDeclaration && node.parameters.length > 0) {
                    const parametersName = new Set();
                    for (const parameter of node.parameters) {
                        if (parametersName.has(parameter.name.name)) {
                            context.report(parameter.name, `Duplicated parameter '${parameter.name.name}'`);
                        }
                        else {
                            parametersName.add(parameter.name.name);
                        }
                    }
                }
            }
        };
    }
};