Refused to execute script from because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled

Question

I am trying to setup react routing which works when I click on something on my site the route works, however if I open a new tab and copy that url. I get

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Answer 1

Another thing that can cause this is if the contentBase property is not set correctly. This came up for us in that we were requesting a JS file but getting a 404 and the 404 "page" served by webpack-dev-server comes back as text/html.