저는 npm start 명령어에서 에러가 발생했었는데요, node 버전 문제였습니다.
다른 것 때문에 로컬에 10버전이 세팅되어있었는데, 16버전(현재 stable)으로 버전업 후에 정상동작했습니다.
(참고 : https://stackoverflow.com/questions/69610654/react-project-websocketserver-js-syntaxerror-on-heartbeatinterval)
WebsocketServer.js:10
static heartbeatInterval = 1000;
SyntaxError: Unexpected token =
at new Script (vm.js:79:7)
at NativeCompileCache._moduleCompile (C:\dev\testproject\node_modules\v8-compile-cache\v8-compile-cache.js:240:18)
at Module._compile (C:\dev\testproject\node_modules\v8-compile-cache\v8-compile-cache.js:184:36)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
at Module.load (internal/modules/cjs/loader.js:598:32)
at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
at Function.Module._load (internal/modules/cjs/loader.js:529:3)
at Module.require (internal/modules/cjs/loader.js:636:17)
at require (C:\dev\testproject\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
at Server.getServerTransport (C:\dev\testproject\node_modules\webpack-dev-server\lib\Server.js:1009:28)
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! testproject@1.0.0 start: `webpack-dev-server --mode development --open`
