I try to add MFLiveReloadPlugin to vue.config.js. ( ERROR SyntaxError: Unexpected token '?') error

[GodBeom]

I get an error when I try to add MFLiveReloadPlugin to vue.config.js.
Maybe it's a babel problem, but I can't find the exact cause.
Help. I've been up all night for a few days...

Step 1. add Dependency

• npm i -D @module-federation/fmr

Step 2. add vue.config.js MFLiveReloadPlugin

• const { MFLiveReloadPlugin } = require("@module-federation/fmr"); <---!! error cause !!

Step 3. yarn build or yarn serve ..

• error !
• log:: yarn build then,

 ERROR  SyntaxError: Unexpected token '?'
/Users/god/dev/pilot/web/mono-vue3-module-federation/components/comm-components/node_modules/@module-federation/fmr/src/server/sockets/modules/useSocketMessage.js:36
      data: data ?? undefined,
                  ^

SyntaxError: Unexpected token '?'
    at wrapSafe (internal/modules/cjs/loader.js:931:16)
    at Module._compile (internal/modules/cjs/loader.js:979:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)
    at Module.load (internal/modules/cjs/loader.js:879:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Module.require (internal/modules/cjs/loader.js:903:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (/Users/god/dev/pilot/web/mono-vue3-module-federation/components/comm-components/node_modules/@module-federation/fmr/src/server/sockets/handlers/index.js:4:30)
    at Module._compile (internal/modules/cjs/loader.js:1015:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)

Code : https://github.com/Shin-Beomchul/mono-vue3-module-federation/blob/master/components/comm-components/vue.config.js

[Zack Jackson]

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