change approach again

node_modules/command-line-args/example/validate.js

@@ -0,0 +1,37 @@
+/*
+  command-line-args parses the command line but does not validate what was collected.
+  This example demonstrates how the values collected can be validated.
+*/
+
+'use strict'
+const commandLineArgs = require('../')
+const fs = require('fs')
+
+const optionDefinitions = [
+  { name: 'help', alias: 'h', type: Boolean },
+  { name: 'files', type: String, multiple: true, defaultOption: true },
+  { name: 'log-level', type: String }
+]
+
+const options = commandLineArgs(optionDefinitions)
+
+const valid =
+  options.help ||
+  (
+    /* all supplied files should exist and --log-level should be one from the list */
+    options.files &&
+    options.files.length &&
+    options.files.every(fs.existsSync) &&
+    [ 'info', 'warn', 'error', undefined ].includes(options['log-level'])
+  )
+
+console.log('Your options are', valid ? 'valid' : 'invalid')
+console.log(options)
+
+/*
+Example output:
+
+$ node example/validate.js package.json README.md
+Your options are valid
+{ files: [ 'package.json', 'README.md' ] }
+*/