Warning: A future version of React will block javascript

Question

I cloned repo from gitlab and installed the dependencies then When I type yarn next dev from command line I get

index.js:1 Warning: A future version of React will block javascript: URLs as a security precaution. Use event handlers instead if you can. If you need to generate unsafe HTML try using dangerouslySetInnerHTML instead. React was passed "javascript:;" 

error. And in the browser I get err code 404 on landing page. What is wrong I could not manage to get over.

Answer 1

It seems that somewhere in this code you have an element with an explicit javascript code somewhere in it's attributes. Something along the lines of

<a href="javascript:;" ...>...</a>

as the warning mentions: React was passed "javascript:;". This is probably some old repo, that was using this to get away with <a> tags that do not lead anywhere. The more common solution to this is usig href='#'.

However, the 404 you are getting is probably signifying something more and the repo itself is probably broken.