upgrades and typescript

[dbushong]

The eslint-plugin-prettier upgrade is a breaking change.

The new /typescript endpoint requires the new peerDependencies, but they're not required if you're not using that.

• chore: upgrade to eslint-plugin-prettier 4.x
• feat: add /typescript endpoint

---

This PR was started by: git wf pr

[dbushong]

With this change, we'll be able to go from this:

https://github.com/groupon/gofer-openapi/blob/3eaefca4bd260d64d5d8bdaa1a0fdf80deab36f6/.eslintrc.json

to this:

{
  "root": true,
  "extends": [
    "groupon/typescript",
    "plugin:regexp/recommended"
  ],
  "overrides": [
    {
      "files": [
        "test/**"
      ],
      "env": {
        "mocha": true
      },
      "parserOptions": {
        "project": "test/tsconfig.json"
      }
    }
  ]
}

[erothman-groupon]

👍

[aotarola]

💚