1'use strict'; 2 3// This is an example of using tokens to add a custom behaviour. 4// 5// Throw an error if an option is used more than once. 6 7// 1. const { parseArgs } = require('node:util'); // from node 8// 2. const { parseArgs } = require('@pkgjs/parseargs'); // from package 9const { parseArgs } = require('..'); // in repo 10 11const options = { 12 ding: { type: 'boolean', short: 'd' }, 13 beep: { type: 'boolean', short: 'b' } 14}; 15const { values, tokens } = parseArgs({ options, tokens: true }); 16 17const seenBefore = new Set(); 18tokens.forEach((token) => { 19 if (token.kind !== 'option') return; 20 if (seenBefore.has(token.name)) { 21 throw new Error(`option '${token.name}' used multiple times`); 22 } 23 seenBefore.add(token.name); 24}); 25 26console.log(values); 27 28// Try the following: 29// node no-repeated-options --ding --beep 30// node no-repeated-options --beep -b 31// node no-repeated-options -ddd 32