tslint and airbnb config and prettier

tslint.json

{
  "defaultSeverity": "error",
  "extends": [
      "tslint:recommended",
      "tslint-config-airbnb",
      "tslint-config-prettier"
  ],
  "jsRules": {},
  "rules": {
    ...
    "ter-arrow-parens": [true, "always"],
    ...
  },
  "rulesDirectory": []
}