Vue-cli-serve Could not resolve dependency

[throrin19]

Version

4.5.12

Environment info

System:
    OS: macOS 11.2.3
    CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  Binaries:
    Node: 14.15.4 - ~/.nvm/versions/node/v14.15.4/bin/node
    Yarn: Not Found
    npm: 7.5.2 - ~/.nvm/versions/node/v14.15.4/bin/npm
  Browsers:
    Chrome: 90.0.4430.85
    Firefox: 85.0.2
    Safari: 14.0.3
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

• uninstall node_modules and package-lock
• npm install

What is expected?

All packages installed correctly using vue 2 with vue-cli 4.5.12.

What is actually happening?

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/vue
npm ERR!   dev vue@"2.6.12" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer vue@"3.0.11" from @vue/[email protected]
npm ERR! node_modules/@vue/compiler-sfc
npm ERR!   peerOptional @vue/compiler-sfc@"^3.0.0-beta.14" from @vue/[email protected]
npm ERR!   node_modules/@vue/cli-service
npm ERR!     dev @vue/cli-service@"4.5.12" from the root project
npm ERR!     1 more (@vue/cli-plugin-babel)

---

It works fine few days before. Now, it's not working. I think the problem is with @vue/compiler-sfc peerOptional in @vue/cli-service package

[haoqunjiang]

See #6270 (comment). Please update your npm version.

[throrin19]

It's no working with last npm version. To works we have to set the legacy-peer-deps flag and it's not normal...

[haoqunjiang]

Then please open a new issue with a reproduction.