fix(typescript): mark imports/exports that are only used for types ex…

…plicitely (#480)

src/auth.ts

@@ -1,7 +1,7 @@
 import { Deprecation } from "deprecation";
 import * as OAuthAppAuth from "@octokit/auth-oauth-app";
 
-import {
+import type {
   Authentication,
   State,
   AppAuthOptions,

src/cache.ts

@@ -2,7 +2,7 @@
 import { LRUCache } from "lru-cache";
 
 /* istanbul ignore next */
-import {
+import type {
   InstallationAuthOptions,
   Cache,
   CacheData,

src/get-app-authentication.ts

@@ -1,6 +1,6 @@
 import { githubAppJwt } from "universal-github-app-jwt";
 
-import { AppAuthentication, State } from "./types";
+import type { AppAuthentication, State } from "./types";
 
 export async function getAppAuthentication({
   appId,

src/get-installation-authentication.ts

@@ -1,7 +1,7 @@
 import { get, set } from "./cache";
 import { getAppAuthentication } from "./get-app-authentication";
 import { toTokenAuthentication } from "./to-token-authentication";
-import {
+import type {
   InstallationAuthOptions,
   InstallationAccessTokenAuthentication,
   RequestInterface,

src/hook.ts

@@ -4,7 +4,7 @@ import { RequestError } from "@octokit/request-error";
 import { getAppAuthentication } from "./get-app-authentication";
 import { getInstallationAuthentication } from "./get-installation-authentication";
 import { requiresAppAuth } from "./requires-app-auth";
-import {
+import type {
   AnyResponse,
   EndpointOptions,
   RequestParameters,

src/index.ts

@@ -5,11 +5,11 @@ import { createOAuthAppAuth } from "@octokit/auth-oauth-app";
 import { auth } from "./auth";
 import { hook } from "./hook";
 import { getCache } from "./cache";
-import { AuthInterface, State, StrategyOptions } from "./types";
+import type { AuthInterface, State, StrategyOptions } from "./types";
 import { VERSION } from "./version";
 
 export { createOAuthUserAuth } from "@octokit/auth-oauth-user";
-export {
+export type {
   // strategy options
   StrategyOptions,
   // auth options

src/to-token-authentication.ts

@@ -1,4 +1,4 @@
-import {
+import type {
   CacheData,
   InstallationAccessTokenAuthentication,
   WithInstallationId,