vite-ssr doesn't appear to be written in CJS, but also doesn't appear to be a valid ES module (i.e. it doesn't have "type": "module" or an .mjs extension for the entry point). Please contact the package author to fix.

[Carseason]

"dependencies": {
"@vueuse/head": "^0.7.6",
"axios": "^0.26.1",
"element-plus": "^2.1.9",
"express": "^4.17.3",
"pinia": "^2.0.13",
"sass": "^1.50.0",
"vite-ssr": "^0.16.0",
"vue": "3",
"vue-router": "4"
},
"devDependencies": {
"@types/node": "^17.0.24",
"@vitejs/plugin-vue": "^2.3.1",
"typescript": "^4.6.3",
"vite": "^2.9.5",
"vue-tsc": "^0.34.7"
}

[m3hari]

Make sure you set "type": "module" in your packge.json

[Carseason]

ok,Me Not paying attention to new changes

[LittleSound]

I had this problem too, and adding "type": "module" didn't fix it

[Carseason]

me to

[ElBouhaliMohamed]

+1

[frandiox]

You can safely ignore that warning for now. We will probably drop CJS support at some point (perhaps with Vite v3).

[MichealPearce]

I found that adding module.exports = 'i love you' to the index.js of the package fixes the issue.

Looking into the vite code that logs the message, I found a regex check right before it logs.

The regex just checks for some key works for CJS

These are in a function called collectExternals, I wasn't able to find the source in github.

[MichealPearce]

Also found it could be fixed by just adding module.exports as a comment