name : limit-long-syntax.js 'use strict'; // This is an example of using tokens to add a custom behaviour. // // Require the use of `=` for long options and values by blocking // the use of space separated values. // So allow `--foo=bar`, and not allow `--foo bar`. // // Note: this is not a common behaviour, most CLIs allow both forms. // 1. const { parseArgs } = require('node:util'); // from node // 2. const { parseArgs } = require('@pkgjs/parseargs'); // from package const { parseArgs } = require('..'); // in repo const options = { file: { short: 'f', type: 'string' }, log: { type: 'string' }, }; const { values, tokens } = parseArgs({ options, tokens: true }); const badToken = tokens.find((token) => token.kind === 'option' && token.value != null && token.rawName.startsWith('--') && !token.inlineValue ); if (badToken) { throw new Error(`Option value for '${badToken.rawName}' must be inline, like '${badToken.rawName}=VALUE'`); } console.log(values); // Try the following: // node limit-long-syntax.js -f FILE --log=LOG // node limit-long-syntax.js --file FILE