switch to @octokit/request-error

package.json

@@ -25,6 +25,7 @@
   "homepage": "https://github.com/octokit/auth-app.js#readme",
   "dependencies": {
     "@octokit/request": "^5.3.0",
+    "@octokit/request-error": "^1.0.4",
     "@octokit/types": "^1.1.0",
     "@types/lru-cache": "^5.1.0",
     "lru-cache": "^5.1.1",

src/get-oauth-authentication.ts

@@ -4,6 +4,7 @@ import {
   StrategyOptionsWithDefaults,
   OAuthAccesTokenAuthentication
 } from "./types";
+import { RequestError } from '@octokit/request-error';
 
 export async function getOAuthAuthentication(
   state: StrategyOptionsWithDefaults,
@@ -37,9 +38,10 @@ export async function getOAuthAuthentication(
   const response = await request(route, parameters);
 
   if (response.data.error !== undefined) {
-    throw new Error(
-      response.data.error_description || `Unknown error: ${response.data.error}`
-    );
+    throw new RequestError(`${response.data.error_description} (${response.data.error})`, response.status, {
+      headers: response.headers,
+      request: request.endpoint(route, parameters)
+    });
   }
 
   const {