chore: refactor pipeline and update dependencies (#73)

* chore: refactor pipeline and update dependencies  
* refactor: convert Webpack config file to TS

Author: iignatov

Gruntfile.js

@@ -84,10 +84,10 @@ yarn install
 
 ### Tasks
 
-- `yarn start` - Starts the grunt watch daemon for development.
-- `yarn run lint` - Lints all files.
-- `yarn run build` - Builds a distribution version of the library.
-- `yarn run test` - Runs the unit tests.
+- `yarn start` - Starts Webpack in development/watch mode.
+- `yarn lint` - Lints all files.
+- `yarn build` - Builds a distribution version of the library.
+- `yarn test` - Runs the unit tests.
 
 ## Contributing
 
@@ -107,16 +107,16 @@ Once you have done that:
 git flow release start "NEW_VERSION"
 yarn install
 ./bump_version.sh OLD_VERSION NEW_VERSION
-yarn run build
-yarn run test
+yarn build
+yarn test
 git flow release finish "NEW_VERSION"
 ```
 
 # Test Coverage
 
 Run:
 ```bash
-yarn run test --coverage
+yarn test --coverage
 ```
 
 ## License

README.md

@@ -1,42 +1,42 @@
 {
   "scripts": {
-    "build": "grunt build",
-    "clean": "grunt clean",
+    "build": "yarn clean && cross-env NODE_ENV=production webpack",
+    "clean": "rimraf dist",
     "lint": "yarn eslint 'src/**/*.{ts,tsx}'",
-    "start": "grunt",
+    "start": "cross-env NODE_ENV=development webpack --watch",
     "e2e-build": "cp ./dist/leanplum.min.js ./test/e2e/ && cp ./dist/sw/sw.min.js ./test/e2e/",
     "e2e-serve": "yarn run e2e-build && http-server test/e2e -p 8989 -a localhost",
     "e2e-deploy": "yarn run e2e-build && now deploy test/e2e",
     "test": "jest"
   },
   "license": "Apache-2.0",
   "devDependencies": {
-    "@types/jest": "^25.1.1",
-    "@types/node": "^13.5.0",
-    "@typescript-eslint/eslint-plugin": "^2.28.0",
-    "@typescript-eslint/parser": "^2.28.0",
+    "@types/jest": "^25.2.1",
+    "@types/node": "^13.13.4",
+    "@types/webpack": "^4.41.12",
+    "@typescript-eslint/eslint-plugin": "^2.29.0",
+    "@typescript-eslint/parser": "^2.29.0",
     "chai": "^3.5.0",
+    "cross-env": "^7.0.2",
     "dts-bundle": "^0.7.3",
     "eslint": "^6.8.0",
     "eslint-loader": "^4.0.0",
-    "fork-ts-checker-webpack-plugin": "^4.0.4",
-    "grunt": "^1.0.1",
-    "grunt-contrib-clean": "^2.0.0",
-    "grunt-contrib-jshint": "^1.1.0",
-    "grunt-webpack": "^3.0.0",
+    "fork-ts-checker-webpack-plugin": "^4.1.3",
     "http-server": "^0.12.1",
-    "jest": "^25.1.0",
+    "jest": "^25.4.0",
     "jsdom": "^9.12.0",
-    "lodash.clonedeep": "^4.5.0",
     "lodash.isequal": "^4.5.0",
     "lodash.merge": "^4.6.2",
     "mock-local-storage": "^1.0.2",
+    "rimraf": "^3.0.2",
     "sinon": "^2.1.0",
-    "ts-jest": "^25.2.0",
-    "ts-loader": "^6.2.1",
-    "typescript": "^3.7.2",
+    "ts-jest": "^25.4.0",
+    "ts-loader": "^7.0.1",
+    "ts-node": "^8.9.1",
+    "typescript": "^3.8.3",
     "uglifyjs-webpack-plugin": "^2.2.0",
-    "webpack": "^4.41.2"
+    "webpack": "^4.43.0",
+    "webpack-cli": "^3.3.11"
   },
   "name": "leanplum-sdk",
   "description": "This is the JavaScript SDK for Leanplum, allowing developers to access and integrate the functionality of Leanplum with applications and devices through JavaScript and HTML5. Leanplum is an application development platform that provides mobile A/B testing, messaging functionality, personalization, and more features for applications. ## Installation Add leanplum.js to your project: ```javascript <script type=\"text/javascript\" src=\"leanplum.js\"></script> ``` ## Usage Initialize Leanplum.",

dist/leanplum.js

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "allowJs": true,
+    "allowSyntheticDefaultImports": true,
     "declaration": true,
     "esModuleInterop": true,
     "lib": [