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Login doesnt work with create-react-app v5

CRA 5 moved to webpack 5, which breaks with the JWT library you are depending on.

this is what WP spits out at you (there are several errors like this for different libraries):

Module not found: Error: Can't resolve 'buffer' in <my code>
BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
	- add a fallback 'resolve.fallback: { "buffer": require.resolve("buffer/") }'
	- install 'buffer'
If you don't want to include a polyfill, you can use an empty module like this:
	resolve.fallback: { "buffer": false }

Module not found: Error: Can't resolve 'crypto' in <my code>
BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
	- add a fallback 'resolve.fallback: { "crypto": require.resolve("crypto-browserify") }'
	- install 'crypto-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
	resolve.fallback: { "crypto": false }

There are ways around it, but they aren't really applicable when using create-react-app, since it blocks you from (easily) updating the webpack configuration.

I found the easiest approach was to use a pure browser js jwt library instead, I used https://kjur.github.io/jsrsasign/

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