Separate configs into client and middleware types

Author: Hyunje Jun

lib/client.ts

@@ -3,9 +3,9 @@ import * as URL from "./urls";
 import { toArray } from "./util";
 
 export default class Client {
-  public config: Line.Config;
+  public config: Line.ClientConfig;
 
-  constructor(config: Line.Config & { channelAccessToken: string }) {
+  constructor(config: Line.Config & Line.ClientConfig) {
     if (!config.channelAccessToken) {
       throw new Error("no channel access token");
     }

lib/middleware.ts

@@ -9,7 +9,7 @@ export type NextCallback = (err?: Error) => void;
 
 export type Middleware = (req: Request, res: Response, next: NextCallback) => void;
 
-export default function middleware(config: Line.Config & { channelSecret: string }): Middleware {
+export default function middleware(config: Line.Config & Line.MiddlewareConfig): Middleware {
   if (!config.channelSecret) {
     throw new Error("no channel secret");
   }

types/global.d.ts

@@ -5,11 +5,16 @@
 declare module "got";
 
 declare namespace Line {
-  export type Config = {
-    channelAccessToken?: string,
-    channelSecret?: string,
+  export type ClientConfig = {
+    channelAccessToken: string,
   };
 
+  export type MiddlewareConfig = {
+    channelSecret: string,
+  };
+
+  export type Config = ClientConfig | MiddlewareConfig;
+
   export type Profile = {
     displayName: string,
     userId: string,