Next.js에서 npm run dev 오류 해결 (SyntaxError: Unexpected token '??=')

오류내용 SyntaxError: Unexpected token '??=' at wrapSafe (internal/modules/cjs/loader.js:988:16) at Module._compile (internal/modules/cjs/loader.js:1036:27) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10) at Module.load (internal/modules/cjs/loader.js:937:32) at Function.Module._load (internal/modules/cjs/loader.js:778:12) at Module.require (internal/modules/cjs/loader.js:9..