replace parcel with rollup..

.babelrc

@@ -0,0 +1,41 @@
+{
+  "presets": [
+      [
+      "@babel/preset-env",
+        {
+          "targets": {
+            "node": "current",
+            "browsers": [
+              "last 5 versions",
+              "not ie <= 8"
+            ]
+          },
+          "modules": false
+        }
+      ]
+  ],
+  "plugins": [
+    "add-module-exports"
+  ],
+  "env": {
+    "test": {
+      "presets": [
+          [
+          "@babel/preset-env",
+            {
+              "targets": {
+                "node": "current",
+                "browsers": [
+                  "last 5 versions",
+                  "not ie <= 8"
+                ]
+              }
+            }
+          ]
+      ],
+      "plugins": [
+        "add-module-exports"
+      ]
+    }
+  }
+}

.eslintrc

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+{
+  "extends": "eslint:recommended",
+  "env": {
+    "browser": true,
+    "node": true,
+    "es6": true
+  },
+  "globals": {
+    "window": true,
+    "ga": true
+  },
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 2017
+  },
+  "rules": {
+    "no-console": ["off"],
+    "no-tabs": ["off"],
+    "indent": ["off"],
+    "eol-last": "off",
+    "func-names": ["off"],
+    "max-len": "off",
+    "no-param-reassign": ["error", { "props": false }],
+    "no-shadow": ["error", { "hoist": "never" }],
+    "no-unused-vars": ["off"],
+    "import/prefer-default-export": ["off"]
+  }
+}

rollup.config.js

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+
+import resolve from 'rollup-plugin-node-resolve';
+import babel from 'rollup-plugin-babel';
+import { eslint } from 'rollup-plugin-eslint';
+import uglify from 'rollup-plugin-uglify-es';
+
+const dist = 'dist';
+
+export default {
+  input: 'js/scrambler.js',
+  output: [
+    {
+      file: `${dist}/scrambler.cjs.js`,
+      format: 'cjs'
+    },
+    {
+      file: `${dist}/scrambler.esm.js`,
+      format: 'esm'
+    },
+    {
+      name: 'Scrambler',
+      file: `${dist}/scrambler.umd.js`,
+      format: 'umd'
+    },
+    {
+      name: 'Scrambler',
+      file: `${dist}/scrambler.iife.js`,
+      format: 'iife'
+    },
+    {
+      name: 'Scrambler',
+      file: `${dist}/scrambler.min.js`,
+      format: 'iife'
+    }
+  ],
+  plugins: [
+    resolve(),
+    eslint(),
+    babel({
+      exclude: 'node_modules/**'
+    }),
+    uglify()
+  ]
+}