Improve CLI

bin/cli.js

@@ -5,21 +5,24 @@
 const fs = require('fs');
 const program = require('commander');
 const precinct = require('../index.js');
-const { version } = require('../package.json');
+const { name, description, version } = require('../package.json');
 
 program
-  .arguments('<filename>')
+  .name(name)
+  .description(description)
   .version(version)
+  .argument('<filename>')
   .option('--es6-mixed-imports', 'Fetch all dependendies from a file that contains both CJS and ES6 imports')
   .option('-t, --type <type>', 'The type of content being passed in. Useful if you want to use a non-JS detective')
+  .showHelpAfterError()
   .parse();
 
-const cliOptions = program.opts();
+const { es6MixedImports: mixedImports, type } = program.opts();
 const options = {
   es6: {
-    mixedImports: Boolean(cliOptions.es6MixedImports)
+    mixedImports: Boolean(mixedImports)
   },
-  type: cliOptions.type
+  type
 };
 
 const content = fs.readFileSync(program.args[0], 'utf8');