use export keyword

libs/remix-simulator/bin/ethsim

@@ -32,7 +32,7 @@ program
     console.log('details: ', option.details)
     console.log('host: ', option.ip)
     console.log('port: ', option.port)
-    const Server = require('../src/server')
+    const { Server } = require('../src/server')
     const server = new Server({
       coinbase: option.coinbase,
       rpc: option.rpc,

libs/remix-simulator/src/index.ts

@@ -1,2 +1,2 @@
 export { Provider, extend, JSONRPCRequestPayload, JSONRPCResponsePayload, JSONRPCResponseCallback } from './provider'
-export * as Server from './server'
+export { Server } from './server'

libs/remix-simulator/src/server.ts

@@ -6,7 +6,7 @@ import { Provider, ProviderOptions } from './provider'
 import { log } from './utils/logs'
 const app = express()
 
-class Server {
+export class Server {
   provider
   rpcOnly
 
@@ -68,4 +68,3 @@ class Server {
   }
 }
 
-module.exports = Server