Added ESM module support.

Author: erikvullings

README.md

@@ -32,7 +32,7 @@ For more advanced scenario's, however, I can recommend [marked](https://github.c
 
 ## Playground
 
-Head over to [flems.io](https://flems.io) for a [live example](https://flems.io/#0=N4IgtglgJlA2CmIBcAWAnAOjQZgDQgGd4EBjAF3imRAoLIzIJHwDMIEmkBtUAOwEMwiJDXh0GTfCQD2vCnOozedAAQBlWBDBRpAd14qAvCoKbte3hg1ad+gNwAdXk6WrtRlQAMAxCoAqEGQITk5+0ioArkQqAFQx1ub6cbgqAOYATvwARiqBKizp0mAqXLwADmAAugAUABZkZGUESAD0LbodGOVgAFYEGDJgLWX8JADW-KnwLaY2FgC0fQCUKtLpsSxrYzEqZLXwKmWFPfDkqwZcAOKBABIRWTX1jc1tqYG19wNFLfDpEGMANwisE0vFSBBmZlsvEWBCWGBCvB2AHlePAnDs-LppBj-LV0vB0TCVAAxaQRdJOeakiAAolOby+NT3fb8KCI1EHOJkbFxXb4wmxOKbClxHZsOkI5y8TkqAD6cp50gV-IJBzlIvScvytPVcoIEAAHiqiHSDHL4BBUvU5VKnABGDAqTlOABMTqxON42A9AvpvEZ-myCBU8ENgjKwWlAB8g1kOCpE0nE7GAIIE5OZlMqADC0mksBTTmj81LZfLFejSArNdLSBLFfrxZUMkL2FyBCzsb+1rI834mlSaKgKljABJ7QA2AAM09HzdbKldHa7Lfgcl+lFXiYny+jzYAXvAspkTGQ-mUxKOVPwM2j+GRtzv7fPpQBZNYHCiGx+6d4qBwHE8CBeFBeBqjHGQoHgJZAM8EwIwQO1eAAPhUVMVHjaRxhUABHCJpAoJw0NGQoCE7JUVDA-pEQ-DNv3oDAME8RxpTADACV4aD0mqHQSAiIQ5AwLJpCgABPFIwGqAByKBaWkySGHSKIyGqBJoQ49duOqbQlj0pY7GYQhiFOMgIFkTgQAAViQacQAAX0qfBQTGTgeBAAQhGoSA9j+WAjIpfyRCeJpWhaCJyjGVIviGHz8XYAABR1HUnFo4r8jA+iMsgxMvagCBIC8yAc3A+EEYRCChBY+gS6cMGSgL0iCkAQpecLIuiwZITmfRYVq+r6paTQsm6xJLCy-AcrykQCqKhzKnsoA).
+Head over to [flems.io](https://flems.io) for a [live example](https://flems.io/#0=N4IgtglgJlA2CmIBcAWAnAOjQZgDQgGd4EBjAF3imRAoLIzIJHwDMIEmkBtUAOwEMwiJDXh0GTfCQD2vCnOoQwAB2kAnMgAJgmgMqwlUaQHdemgL6aWa6WE0ByAgbBHTAWgBWBAAIAGDACMGNj2ANwAOryRMrx0mi6aALyaAAYAxJoAKhBkCJGRmdKaAK5EmgBU5fqGJryVuJoA5mr8AEaaOVY2dly8ymAAugAUABZkZMoESAD008bzGH1gXhgyYNPK-CQA1vyN8NNONe5eAJSa6hUs6tvlmmQj8JrKNh7w5BdmXADiOQASxVawzGEyms0aORGgNWtmm8DUEG2ADdirADLxGgRDs5XLxPARThh8nVNAB5XjwSJ3TLGaRUrIjNTwSl4zQAMWkxTUkTc7IgSJZkTSGV0gMe-CgxPJT0qZFplXujOZFUq1y5lTubAFRKivGlmgA+ga5dIjYqmU8DWq1AarPzLQaCBAAB5mogCswG+AQRpjA06yJBMkUyIAJgwWVpkWwEcySsFvGFWTaCE08GdgmUeV1AB9k60OJoi8Wi3mAIJMktV0uaADC0mksFLkRzbjb7Y7nZzSE7vbbSFbnYHLc0Mib2A6BGreYRvrIbn4BkaFKgmjzABIAgA2Xy+NcjseaUOT6ej+ByeGUU9FzfHnMjgBe8FaLU0dARyjEa80-ErFP4WhVnmxabvuuoALLqE8FDOloxiQpo4ThCkEC8Oi8BDOuMhQPApxISkb6ZggAa8AAfJoZaaAW0g7JoACOxTSBQkTkVsNgEFOJqaOhBAkZBlYwfQGAYCkES6mAGBMrwOFqEMRgkMUQhyBgrTSFAACeDRgEM9hQPy9haQwailGQQzVC4tSSeeMlDC4pz2acoTMIQxDvGQECyJwIC+Kg2AgOYAz4Oi2ycDwIACEI1CQA8CKwM5XJxSIIKTDM0zFH02yNDC6zRYy7DeEEQRbtMuWxRgXjOWQ6mftQBAkB+ZD+QM5hAA).
 
 ## Usage
 

rollup.config.js

@@ -8,25 +8,24 @@ const production = !process.env.ROLLUP_WATCH;
 export default {
   input: `src/index.ts`,
   watch: 'src/**',
-  context: 'null',
-  moduleContext: 'null',
   output: [
     {
       name: 'slimdown',
       file: pkg.main,
       format: 'iife',
       sourcemap: true,
     },
+    {
+      file: pkg.module,
+      format: 'es',
+      sourcemap: true,
+    },
   ],
-  // Indicate here external modules you don't want to include in your bundle
-  watch: {
-    include: 'src/**',
-  },
   plugins: [
     // Compile TypeScript files
     typescript({
       rollupCommonJSResolveHack: true,
-      tsconfigOverride: { compilerOptions: { module: 'ES2015' } },
+      // tsconfigOverride: { compilerOptions: { module: 'ES2015' } },
       typescript: require('typescript'),
     }),
     // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)

tsconfig.json

@@ -2,9 +2,9 @@
   "compilerOptions": {
     /* Basic Options */
     "target":
-      "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
+      "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
     "module":
-      "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
+      "es6" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
     "lib": [
       "dom",
       "es5",