Developing with Yarn & Webpack, issues with error reporting and css

Another possibility is that yarn build:production was run. If yarn build:production is run, you’ll need to run yarn build at least once before running yarn start again to clear out the versioned, cache-busting files and begin developing again. This catches me off guard about once every three weeks.

yarn start also runs its own little web server at localhost:3000 where you’ll see the live changes to your site. Are you able to reach that address while yarn:start is running?

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