Documentation contributor - Error: Cannot find module 'C:\Users\tonyh\Documents\vscode\jest\website/backers.json'

[tonyhallett]

🐛 Bug Report

docusaurus-start error

To Reproduce

Follow the guidelines

$ cd website # Only needed if you are not already in the website directory
$ yarn
$ yarn start

Error: Cannot find module 'C:\Users\tonyh\Documents\vscode\jest\website/backers.json'

Expected behavior

Documentation server starts

Reason for the error

backers.json is required in jest\website\pages\en\index.js
backers.json is not in the repo ( gitignore ), it is generated by fetchSupporters.js
https://github.com/facebook/jest/blob/99c6fb1e5d5db037ab42ea12ddc6cb9ed16e3785/website/fetchSupporters.js#L44
This is not a problem for circleci.
But it is an issue when following the contributing guidelines as yarn start does not ensure the file has been generated
https://github.com/facebook/jest/blob/99c6fb1e5d5db037ab42ea12ddc6cb9ed16e3785/website/package.json#L6

envinfo

System:
OS: Windows 10 10.0.18363
CPU: (4) x64 Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz
Binaries:
Node: 12.13.0 - C:\Program Files\nodejs\node.EXE
Yarn: 1.22.4 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.9.0 - C:\Users\tonyh\AppData\Roaming\npm\npm.CMD

[jeysal]

Fixed by #10631

[github-actions]

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