feat: Add Typescript definitions (#184)

* feat: add Typescript definitions

Co-authored-by: Filip Skokan <panva.ip@gmail.com>

.github/workflows/test.yml

@@ -17,6 +17,7 @@ jobs:
           node-version: 12
       - run: npm install
       - run: npm run lint
+      - run: npx dtslint --onlyTestTsNext types
 
   test:
     name: Node Tests + Coverage

README.md

@@ -250,7 +250,8 @@ standard Node.js OpenSSL.
 
 #### Semver?
 
-**Yes.** Everything that's [documented][documentation] is subject to
+**Yes.** Everything that's either exported in the TypeScript definitions file or
+[documented][documentation] is subject to
 [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html). The rest is to be considered
 private API and is subject to change between any versions.
 
@@ -268,6 +269,7 @@ results.
 - Added support for any additional token exchange parameters to support specifications such as
   Resource Indicators
 - Typed [errors][documentation-errors]
+- TypeScript definitions
 
 #### How to make the client send client_id and client_secret in the body?
 

package.json

@@ -27,9 +27,11 @@
   "license": "MIT",
   "author": "Filip Skokan <panva.ip@gmail.com>",
   "files": [
-    "lib"
+    "lib",
+    "types/index.d.ts"
   ],
   "main": "lib/index.js",
+  "types": "types/index.d.ts",
   "scripts": {
     "coverage": "nyc mocha",
     "lint": "eslint lib test",
@@ -50,6 +52,7 @@
   "devDependencies": {
     "@commitlint/cli": "^8.1.0",
     "@commitlint/config-conventional": "^8.1.0",
+    "@types/got": "^9.6.7",
     "chai": "^4.2.0",
     "eslint": "^6.2.2",
     "eslint-config-airbnb-base": "^14.0.0",