How to use the @liskhq/lisk-cryptography.signDataWithPrivateKey function in @liskhq/lisk-cryptography

previousBlockId: previousBlock.id,
			generatorPublicKey: keypair.publicKey.toString('hex'),
			transactions: blockTransactions,
			height: nextHeight,
			maxHeightPreviouslyForged,
			maxHeightPrevoted,
		};

		// Reduce reward based on BFT rules
		if (!this.bftModule.isBFTProtocolCompliant(block)) {
			block.reward = block.reward.times(0.25);
		}

		return {
			...block,
			blockSignature: signDataWithPrivateKey(
				hash(getBytes(block)),
				keypair.privateKey,
			),
		};
	}

const sign = (block, keypair) =>
	signDataWithPrivateKey(hash(getBytes(block)), keypair.privateKey);

totalAmount,
			totalFee,
			height: nextHeight,
			reward,
			payloadHash,
			timestamp,
			numberOfTransactions: blockTransactions.length,
			payloadLength: size,
			previousBlockId: previousBlock.id,
			generatorPublicKey: keypair.publicKey.toString('hex'),
			transactions: blockTransactions,
		};

		return {
			...block,
			blockSignature: signDataWithPrivateKey(
				hash(getBytes(block)),
				keypair.privateKey,
			),
		};
	}
}

const sign = (block, keypair) =>
	signDataWithPrivateKey(hash(getBytes(block)), keypair.privateKey);

const sign = (block, keypair) =>
	signDataWithPrivateKey(hash(getBytes(block)), keypair.privateKey);