Add typescript testing (#1165)

* add ts baseline test

* fix typo

* Integrate ts testing into test script, add needed dependencies, run prettier on tests.ts

* remove broken tests (extracted to future PR)

.prettierrc

@@ -0,0 +1,8 @@
+{
+  "bracketSpacing": true,
+  "jsxBracketSameLine": false,
+  "printWidth": 100,
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

package.json

@@ -37,6 +37,7 @@
     "browserify-istanbul": "2.0.0",
     "chai": "3.5.0",
     "coveralls": "2.11.16",
+    "dtslint": "^0.4.2",
     "eslint": "3.15.0",
     "eslint-config-airbnb": "14.1.0",
     "eslint-plugin-import": "2.2.0",
@@ -67,13 +68,17 @@
     "rollup-plugin-node-resolve": "2.0.0",
     "rollup-plugin-uglify": "1.0.1",
     "sinon": "1.17.7",
+    "tslint": "^5.12.1",
+    "typescript": "^3.2.2",
     "watchify": "3.9.0",
     "yargs": "6.6.0"
   },
   "scripts": {
+    "pretest": "npm run test:typescript",
     "test": "npm run test:new && npm run test:compat",
     "test:new": "karma start karma.conf.js --singleRun",
     "test:compat": "karma start karma.backward.conf.js --singleRun",
+    "test:typescript": "tslint --project tsconfig.json",
     "tdd": "karma start karma.conf.js",
     "tdd:compat": "karma start karma.backward.conf.js",
     "clean": "rimraf dist && mkdirp dist",