getAdapter method should became public to let adapters like axios-mock-adapter access http / xhr known adapters

[paztis]

Describe the bug

libraries like axios-mock-adapter define an adapter but in same cases need to access to original adapter.

It was working correctly before as the adapter was always a function.
Now it can be an array of string

Only the method getAdapter() in adapters/adapter.js can allow access to original adapters (xhr and http)
But this method is not exported a all at top level.

Can you export it ?

To Reproduce

Try to use axios-mock-adapter plugin with onNoMatch option

Code snippet

No response

Expected behavior

No response

Axios Version

1.2.1 and upper

Adapter Version

No response

Browser

No response

Browser Version

No response

Node.js Version

No response

OS

No response

Additional Library Versions

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Additional context/Screenshots

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[mogzol]

I would also appreciate this. I have a custom adapter that wraps the default one, but it is unusable with the latest axios releases due to it being impossible to access the default adapters.

[unional]

The http adapter is also needed to workaround an issue for jsdom: https://stackoverflow.com/questions/51054286/cross-origin-http-request-originating-from-server-side-nodejs-axios-jsdom

Currently it is not exposed and with exports field we can't even force our way in using declare module 'axios/lib/adapters/http' for TypeScript.

UPDATE: that issue can be fixed by axios.defaults.adapter = 'http'