fix(core): update

babel.config.js

@@ -0,0 +1,6 @@
+const plugins = [
+  '@babel/plugin-proposal-class-properties',
+  ['@babel/plugin-proposal-decorators', { decoratorsBeforeExport: true } ],
+];
+
+module.exports = { plugins };

package.json

@@ -20,5 +20,15 @@
     "tslint": "^5.11.0",
     "tslint-config-prettier": "^1.15.0"
   },
-  "dependencies": {}
+  "dependencies": {
+    "@babel/core": "^7.4.3",
+    "@babel/plugin-proposal-class-properties": "^7.4.4",
+    "@babel/plugin-proposal-decorators": "^7.4.4",
+    "rollup": "^1.10.1",
+    "rollup-plugin-babel": "^4.3.2",
+    "rollup-plugin-commonjs": "^9.3.4",
+    "rollup-plugin-node-resolve": "^4.2.3",
+    "rollup-plugin-sourcemaps": "^0.4.2",
+    "rollup-plugin-typescript2": "^0.20.1"
+  }
 }

rollup.config.js

@@ -0,0 +1,38 @@
+import resolve from 'rollup-plugin-node-resolve'
+import commonjs from 'rollup-plugin-commonjs'
+import sourceMaps from 'rollup-plugin-sourcemaps'
+import camelCase from 'lodash.camelcase'
+import typescript from 'rollup-plugin-typescript2'
+import json from 'rollup-plugin-json'
+
+const pkg = require('./package.json')
+
+export default {
+  input: `src/index.ts`,
+  output: {
+		file: 'ts/index.ts',
+    format: 'es',
+		sourcemap: true
+	},
+  // Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
+  external: [],
+  watch: {
+    include: 'src/**',
+  },
+  plugins: [
+    // Allow json resolution
+    json(),
+    // Compile TypeScript files
+    typescript({ useTsconfigDeclarationDir: true }),
+    // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
+    commonjs(),
+    // Allow node_modules resolution, so you can use 'external' to control
+    // which external modules to include in the bundle
+    // https://github.com/rollup/rollup-plugin-node-resolve#usage
+    resolve(),
+
+    // Resolve source maps to the original source
+    sourceMaps(),
+    babel()
+  ],
+}