message: Update Babel and TypeScript devDependencies to latest versions.
diff: "source-map": "~0.6.1"
  },
  "devDependencies": {
  - "@babel/core": "^7.2.2",
  - "@babel/parser": "^7.3.4",
  - "@babel/preset-env": "^7.3.1",
  + "@babel/core": "^7.4.0",
  + "@babel/parser": "^7.4.2",
  + "@babel/preset-env": "^7.4.2",
  "@types/esprima": "^4.0.2",
  "@types/glob": "^7.1.1",
  "@types/mocha": "^5.2.5",
  "ts-add-module-exports": "^1.0.0",
  "ts-emit-clean": "^1.0.0",
  "ts-node": "^7.0.1",
  - "typescript": "^3.3.3"
  + "typescript": "^3.3.4000"
  },
  "engines": {
  "node": ">= 4"
  