Convert base64 string to bytes array

Hello, I am working on creating performance tests using K6. I wanted to convert a base64 string to a byte array but it’s not working as I am getting below error:
ERRO[0002] Uncaught (in promise) GoError: unable to serialise request object to protocol buffer: proto: (line 1:22): invalid value for bytes type: {
I am using below code from here to do so. Can someone please take a look?

const decBin = new Uint8Array(encoding.b64decode(enc));

Thanks for your time.

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