Merge pull request #11 from angeloashmore/rollup

feat: add ES module support

package.json

@@ -1,15 +1,17 @@
 {
   "name": "ts-imgix",
-  "main": "./target/index.js",
+  "main": "./target/index.cjs.js",
+  "module": "./target/index.esm.js",
   "typings": "./target/index.d.ts",
+  "sideEffects": false,
   "repository": {
     "type": "git",
     "url": "https://github.com/unsplash/ts-imgix.git"
   },
   "version": "0.0.11",
   "scripts": {
     "lint": "tslint --project ./tsconfig.json",
-    "compile": "rm -rf ./target/ && tsc",
+    "compile": "rm -rf ./target/ && rollup -c",
     "test": "npm run compile && node --require source-map-support/register ./target/tests.js",
     "format": "prettier --write './**/*.{ts,tsx,js,json,md}' '.prettierrc'",
     "prepublishOnly": "npm run test && npm run lint && npm run compile"
@@ -22,6 +24,9 @@
   },
   "devDependencies": {
     "prettier": "^1.15.3",
+    "rollup": "^2.7.2",
+    "rollup-plugin-auto-external": "^2.0.0",
+    "rollup-plugin-typescript2": "^0.27.0",
     "source-map-support": "^0.5.9",
     "tslint": "^5.11.0",
     "tslint-language-service": "^0.9.9",

rollup.config.js

@@ -0,0 +1,20 @@
+import typescript from 'rollup-plugin-typescript2';
+import autoExternal from 'rollup-plugin-auto-external';
+
+import pkg from './package.json';
+
+export default [
+    {
+        input: 'src/index.ts',
+        output: [
+            { file: pkg.main, format: 'cjs', sourcemap: true },
+            { file: pkg.module, format: 'es', sourcemap: true },
+        ],
+        plugins: [autoExternal(), typescript()],
+    },
+    {
+        input: 'src/tests.ts',
+        output: { file: 'target/tests.js', format: 'cjs' },
+        plugins: [autoExternal(), typescript()],
+    },
+];

tsconfig.json

@@ -1,6 +1,7 @@
 {
     "compilerOptions": {
-        "module": "commonjs",
+        "module": "esnext",
+        "moduleResolution": "node",
         // Assumption: most consumers of this lib will be using UglifyJS which does not support
         // ES2015+ syntax, so we target ES5 instead.
         "target": "es5",