error: undefined is not a function when using crypto.sign

[informsharique]

So, I have set up the library as directed in the docs. and I'm using crypto.sign to sign some data. But it produces an error saying undefined is not a function pointing at sign function as you can see in the below image

Below is the code I'm executing on press of a button

const operation = crypto.sign(
    'RSA-SHA256',
    someArrayBuffer,
    'key',
);

[ReiDuo]

I had this same issue, I had to reference Quickcrypto directly:

import {QuickCrypto} from "react-native-quick-crypto/src/QuickCrypto";

const sign = QuickCrypto.createSign("SHA256withRSA")
sign.write(dataToSign)
sign.end()

    actually signing does cause my app to crash, and at reload I get the error that Error: RNEncryptedStorage is undefined.

Let me know if this helped though, and whether this works for you