Setup eslint and enforce rules

src/cli/directive/options/PositionalOption.ts

@@ -1,4 +1,4 @@
-import {CLIOption} from "./CLIOption"
+import {CLIOption} from './CLIOption'
 
 /**
  * A positional CLI option. Defined without a flag.
@@ -19,14 +19,16 @@ export class PositionalOption<T> extends CLIOption<T> {
         /**
          * A usage message describing this parameter.
          */
-        public readonly message: string = ''
-    ) { super() }
+        public readonly message: string = '',
+    ) {
+        super()
+    }
 
     /**
      * Gets the name of the option.
      * @returns {string}
      */
-    getArgumentName () {
+    getArgumentName(): string {
         return this.name
     }
 }