Convert to TypeScript

.gitignore

@@ -3,6 +3,7 @@
 /.nyc_output/*
 /examples/build/*
 /commonjs/*
+/esm/*
 
 .vscode/*
 

package.json

@@ -1,13 +1,14 @@
 {
   "name": "jargs",
-  "version": "0.4.7",
+  "version": "1.0.0-alpha.0",
   "description": "Simple node arg parser with explicit tree structure schema",
   "main": "commonjs/index.js",
-  "module": "src/index.js",
-  "types": "index.d.ts",
+  "module": "esm/index.js",
+  "types": "esm/index.d.ts",
   "scripts": {
-    "dist": "npm run commonjs",
+    "dist": "npm run commonjs && npm run esm",
     "commonjs": "rm -rf commonjs && tsc --project tsconfig.commonjs.json",
+    "esm": "rm -rf esm && tsc --project tsconfig.esm.json",
     "lint": "eslint src/ examples/ tests/",
     "tests": "jest --runInBand --coverage",
     "typecheck": "tsc --noEmit --project tsconfig.json",

src/arg.ts

@@ -0,0 +1,36 @@
+import { ArgArgs, ArgNode } from './types';
+import { ValidOptions } from './types-internal';
+import {
+  getNodeProperties,
+  serializeOptions,
+  validateName,
+  withDefault,
+} from './utils';
+
+const validOptions = {
+  description: {
+    type: 'string',
+    default: '',
+  },
+  options: {
+    type: 'array',
+  },
+  type: {
+    type: 'string',
+  },
+  multi: {
+    type: 'boolean',
+    default: false,
+  },
+} satisfies ValidOptions;
+
+export function Arg(...args: ArgArgs) {
+  const properties = getNodeProperties(args);
+  validateName(properties.name);
+  serializeOptions(withDefault(properties.options, {}), validOptions);
+
+  return {
+    ...properties,
+    _type: 'arg',
+  } as ArgNode;
+}