added Linting for TypeScript

.eslintrc.js

@@ -0,0 +1,17 @@
+/* eslint-env node */
+
+export default {
+  parser: "@typescript-eslint/parser",
+  plugins: ["@typescript-eslint"],
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  parserOptions: {
+    project: "./tsconfig.json",
+    sourceType: "module"
+  },
+  rules: {
+    "@typescript-eslint/no-floating-promises": "error"
+  }
+};