How to decode CandyMachine instruction type?

Question

How to decode CandyMachine instruction type?

I can decode Spl instructions:

import * as spl from '@solana/spl-token';
import { TransactionInstruction } from '@solana/web3.js';
import { u8 } from '@solana/buffer-layout';
import { SplToken, SystemProgram as SystemProgramIdl } from '@project-serum/anchor';
import { ParsedInstruction, ParsedIdlInstruction } from './interfaces';


function decodeTokenInstruction(
  instruction: TransactionInstruction,
): ParsedInstruction<SplToken> {
  let parsed: ParsedIdlInstruction<SplToken> | null;
  const decoded = u8().decode(instruction.data);
  switch (decoded) {
    case spl.TokenInstruction.InitializeMint: {
        ...
    }
    case spl.TokenInstruction.InitializeAccount: {
        ...
    }
  }
}

Also SystemInstruction:

function decodeSystemInstruction(
  instruction: TransactionInstruction,
): ParsedInstruction<SystemProgramIdl> {
  const ixType = SystemInstruction.decodeInstructionType(instruction);
  let parsed: ParsedIdlInstruction<SystemProgramIdl> | null;
  switch (ixType) {
    case 'AdvanceNonceAccount': {
        ...
    }
  }
}

But how I can decode type of CandyMachine instructions?

EDIT

Each instruction in CandyMachine has its own instructionDiscriminator, for example:

export const updateCandyMachineInstructionDiscriminator = [243, 251, 124, 156, 211, 211, 118, 239];

I created the following structure:

export const instructionDiscriminatorStruct = new beet.FixableBeetArgsStruct<{
  instructionDiscriminator: number[] /* size: 8 */;
}>([['instructionDiscriminator', beet.uniformFixedSizeArray(beet.u8, 8)]]);

And with it I can get instructionDiscriminator:

const [{ instructionDiscriminator }] = instructionDiscriminatorStruct.deserialize(instruction.data);