customParser.ts

function orcaParser(instruction: TransactionInstruction): ParsedCustomInstruction {
	let name: string;
	let args: unknown;
	let accounts: ParsedAccount[];
	switch (instruction.data[0]) {
		case 1:
			name = "Orca Swap";
			args = { inAmount: instruction.data.readBigInt64LE(1), outAmount: instruction.data.readBigInt64LE(9) };
			accounts = [
				{ name: "swap", ...instruction.keys[0] },
				{ name: "authority", ...instruction.keys[1] },
				{ name: "userTransferAuthority", ...instruction.keys[2] },
				{ name: "source", ...instruction.keys[3] },
				{ name: "swapSource", ...instruction.keys[4] },
				{ name: "swapDestination", ...instruction.keys[5] },
				{ name: "destination", ...instruction.keys[6] },
				{ name: "poolMint", ...instruction.keys[7] },
				{ name: "poolFee", ...instruction.keys[8] },
				{ name: "tokenProgram", ...instruction.keys[9] },
			];
			break;
		default:
			name = "unknown";
			args = { unknown: instruction.data };
			accounts = instruction.keys;
			break;
	}

	return {
		programId: instruction.programId,
		name,
		accounts,
		args,
	};
}