chore(typings): change export interface to class definition

index.d.ts

@@ -854,19 +854,18 @@ declare module 'egg' {
    * Singleton instance in Agent Worker, extend {@link EggApplication}
    */
   class Agent extends EggApplication {
-    _wrapMessenger():  void
   }
 
   export interface ClusterOptions {
-    framework: string // specify framework that can be absolute path or npm package
-    baseDir: string // directory of application, default to `process.cwd()`
-    plugins: object // customized plugins, for unittest
-    workers: number // numbers of app workers, default to `os.cpus().length`
-    port: number  // listening port, default to 7001(http) or 8443(https)
-    https: boolean  // https or not
-    key: string //ssl key
-    cert: string  // ssl cert
-    typescript: boolean
+    framework: string; // specify framework that can be absolute path or npm package
+    baseDir: string; // directory of application, default to `process.cwd()`
+    plugins: object; // customized plugins, for unittest
+    workers: number; // numbers of app workers, default to `os.cpus().length`
+    port: number;  // listening port, default to 7001(http) or 8443(https)
+    https: boolean;  // https or not
+    key: string; //ssl key
+    cert: string;  // ssl cert
+    // typescript: boolean;
   }
 
   export function startCluster(options: ClusterOptions, callback: () => any): void