Merge pull request #19 from Agoric/build-dist

Add an npm build script that creates the different dist files

.eslintignore

@@ -0,0 +1,2 @@
+/dist
+

.gitignore

@@ -59,3 +59,6 @@ typings/
 
 # next.js build output
 .next
+
+# dist
+dist/

package.json

@@ -2,11 +2,12 @@
   "name": "@agoric/nat",
   "version": "2.0.0",
   "description": "Ensures that a number is within the natural numbers (0, 1, 2...) or throws a RangeError",
-  "main": "index-commonjs.js",
-  "module": "index.js",
+  "main": "dist/nat.cjs.js",
+  "module": "dist/nat.esm.js",
+  "browser": "dist/nat.umd.js",
   "scripts": {
-    "test": "node test/test.js",
-    "create-cjs": "rollup index.js --file index-commonjs.js --format cjs",
+    "test": "node -r esm test/test.js",
+    "build": "rollup -c",
     "lint-fix": "eslint --fix '**/*.{js,jsx}'",
     "lint-check": "eslint '**/*.{js,jsx}'"
   },
@@ -29,6 +30,7 @@
     "eslint-plugin-jsx-a11y": "^6.2.1",
     "eslint-plugin-prettier": "^3.0.1",
     "eslint-plugin-react": "^7.12.4",
+    "esm": "^3.2.7",
     "prettier": "1.16.4",
     "rollup": "^1.1.2",
     "tape": "^4.9.2"
@@ -40,5 +42,8 @@
     "integer",
     "int",
     "overflow"
+  ],
+  "files": [
+    "dist"
   ]
 }

rollup.config.js

@@ -0,0 +1,20 @@
+export default [
+  {
+    input: 'src/index.js',
+    output: [
+      {
+        file: 'dist/nat.umd.js',
+        format: 'umd',
+        name: 'Nat',
+      },
+      {
+        file: 'dist/nat.esm.js',
+        format: 'esm',
+      },
+      {
+        file: 'dist/nat.cjs.js',
+        format: 'cjs',
+      },
+    ],
+  },
+];

test/test.js

@@ -1,7 +1,7 @@
 /* eslint no-mixed-operators: "off" */
 
-const test = require('tape');
-const Nat = require('../index-commonjs.js');
+import test from 'tape';
+import Nat from '../src/index';
 
 test('Nat() throws when not a natural number', t => {
   t.equal(Nat(0), 0);