npm run dev error caused by @builder.io/dev-tools: package.json invalid path

[ijustwannacodetoday]

Hi, I just signed up for Builder, I’m on the “Welcome to Builder” screen, using “Integrate your existing project”.
I get an error when starting dev server - Error: Invalid path: C:\dev\project\code\package.json (7341) - when executing npm run dev on Windows.

Describe the bug
I created a new Qwik site using Cloudflare Pages integration following Deploy a Qwik site · Cloudflare Pages docs.
Then, I signed up at builder.io, and got to the “Welcome to Builder” screen, which said to run npm init builder.io@latest --existing to “Integrate your existing project”.
After that, I ran npm install and npm run dev, but it errors out right away with the following:

> dev
> vite --mode ssr

error when starting dev server:
Error: Invalid path: C:\dev\project\code\package.json (7341)
    at m (file:///C:/dev/project/code/node_modules/@builder.io/dev-tools/node/index.mjs:1:2907)
    at Object.readFile (file:///C:/dev/project/code/node_modules/@builder.io/dev-tools/node/index.mjs:1:1629)
    at f (file:///C:/dev/project/code/node_modules/@builder.io/dev-tools/node/index.mjs:1:466)
    at u (file:///C:/dev/project/code/node_modules/@builder.io/dev-tools/node/index.mjs:1:583)
    at $ (file:///C:/dev/project/code/node_modules/@builder.io/dev-tools/node/index.mjs:1:2704)
    at configureServer (file:///C:/dev/project/code/node_modules/@builder.io/dev-tools/vite/index.mjs:3:293)
    at _createServer (file:///C:/dev/project/code/node_modules/vite/dist/node/chunks/dep-jDlpJiMN.js:64550:30)
    at async CAC.<anonymous> (file:///C:/dev/project/code/node_modules/vite/dist/node/cli.js:762:24)

To Reproduce
Steps to reproduce the behavior on Windows:

1. npm create cloudflare@latest my-qwik-app -- --framework=qwik
2. npm init builder.io@latest --existing
3. npm install
4. npm run dev

Expected behavior
Qwik dev server working locally on a Windows machine after integrating Builder.

Additional context
These are the dependencies added:

    "@builder.io/dev-tools": "^0.2.19",
    "@builder.io/sdk-qwik": "^0.14.3"

And it fails here:

if(!o.startsWith(n))throw new Error(`Invalid path: ${o} (7341)`)

Debugging values:

n: 'C:/dev/project/code'
o: 'C:\dev\project\code\package.json'

The issue seems to stem from a non-normalized path separator.

Could anyone please help fix this?

[Megasware128]

I have the same issue with the vite qwik template. I'm also running Windows

[Mariolopez78]

I have the same issue

[freebreix]

Encountered the same error. Not a good experience using these great tech together so far.

npm create qwik@latest
npm run qwik add builder.io
npm run dev