How to use the snarkjs.stringifyBigInts function in snarkjs

const createTrustedSetup = async (compiledCircuitFiles) => {
	console.log('===== Trusted Setup Started =====');
	console.log('===== Generating pk and vk =====');
	for (compiledCircuit of compiledCircuitFiles) {
		let extension = path.extname(compiledCircuit, 'json');
		let nameOfFile = path.basename(compiledCircuit, extension);
		const file = require(`${process.cwd()}/${compiledCircuit}`);
		let circuit = new zkSnark.Circuit(file);
		let setup = zkSnark.original.setup(circuit);
		fs.writeFileSync(`${trustedSetup}/${nameOfFile}_proving_key.json`, JSON.stringify(zkSnark.stringifyBigInts(setup.vk_proof), null, 1), "utf8");
		fs.writeFileSync(`${trustedSetup}/${nameOfFile}_verification_key.json`, JSON.stringify(zkSnark.stringifyBigInts(setup.vk_verifier), null, 1), "utf8");
	}
}

const createTrustedSetup = async (compiledCircuitFiles) => {
	console.log('===== Trusted Setup Started =====');
	console.log('===== Generating pk and vk =====');
	for (compiledCircuit of compiledCircuitFiles) {
		let extension = path.extname(compiledCircuit, 'json');
		let nameOfFile = path.basename(compiledCircuit, extension);
		const file = require(`${process.cwd()}/${compiledCircuit}`);
		let circuit = new zkSnark.Circuit(file);
		let setup = zkSnark.original.setup(circuit);
		fs.writeFileSync(`${trustedSetup}/${nameOfFile}_proving_key.json`, JSON.stringify(zkSnark.stringifyBigInts(setup.vk_proof), null, 1), "utf8");
		fs.writeFileSync(`${trustedSetup}/${nameOfFile}_verification_key.json`, JSON.stringify(zkSnark.stringifyBigInts(setup.vk_verifier), null, 1), "utf8");
	}
}

const generateProof = (provingKey, witness, circuit) => {
	console.log('===== Generating Proof =====');
	const proofObject = zkSnark.original.genProof(provingKey, witness);

	let extension = path.extname(circuit, 'json');
	let nameOfFile = path.basename(circuit, extension);
	fs.writeFileSync(`${generatedProofPath}/${nameOfFile}_proof.json`, JSON.stringify(zkSnark.stringifyBigInts(proofObject.proof), null, 1), "utf8");
	fs.writeFileSync(`${generatedProofPath}/${nameOfFile}_public_signals.json`, JSON.stringify(zkSnark.stringifyBigInts(proofObject.publicSignals), null, 1), "utf8");

}

const generateProof = (provingKey, witness, circuit) => {
	console.log('===== Generating Proof =====');
	const proofObject = zkSnark.original.genProof(provingKey, witness);

	let extension = path.extname(circuit, 'json');
	let nameOfFile = path.basename(circuit, extension);
	fs.writeFileSync(`${generatedProofPath}/${nameOfFile}_proof.json`, JSON.stringify(zkSnark.stringifyBigInts(proofObject.proof), null, 1), "utf8");
	fs.writeFileSync(`${generatedProofPath}/${nameOfFile}_public_signals.json`, JSON.stringify(zkSnark.stringifyBigInts(proofObject.publicSignals), null, 1), "utf8");

}

const run = async (signals, proof) => {
	const publicSignals = require(`${process.cwd()}/${generatedProofPath}/${signals}`);
	const generatedProof = zkSnark.unstringifyBigInts((require(`${process.cwd()}/${generatedProofPath}/${proof}`)));

	createGenerateCallFolder(generatedCallPath);

	const generatedCall = await zkSnark.generateCall(publicSignals, generatedProof);
	
	
	fs.writeFileSync(`${generatedCallPath}/generatedCall.json`, zkSnark.stringifyBigInts(generatedCall));
	console.log('===== Generated Call Complete! =====');
	console.log('===== Generated Call: =====')
	console.log(generatedCall)
};

const inputs = {
            'identity_pk[0]': pubKey[0],
            'identity_pk[1]': pubKey[1],
            'auth_sig_r[0]': signature.R8[0],
            'auth_sig_r[1]': signature.R8[1],
            auth_sig_s: signature.S,
            signal_hash,
            external_nullifier,
            identity_nullifier,
            identity_trapdoor,
            identity_path_elements,
            identity_path_index,
            fake_zero: bigInt(0),
        };
        const w = this.circuit.calculateWitness(inputs);
        const witness_bin = proof_util.convertWitness(snarkjs.stringifyBigInts(w));
        const publicSignals = w.slice(1, this.circuit.nPubInputs + this.circuit.nOutputs+1);
        logger.info(`calculating witness (ended at ${Date.now()})`);

        const root = w[this.circuit.getSignalIdx('main.root')];
        const nullifiers_hash = w[this.circuit.getSignalIdx('main.nullifiers_hash')];
        assert(this.circuit.checkWitness(w));
        logger.info(`identity commitment from proof: ${w[this.circuit.getSignalIdx('main.identity_commitment.out[0]')].toString()}`);
        assert.equal(w[this.circuit.getSignalIdx('main.root')].toString(), identity_path.root);

        logger.info(`generating proof (started at ${Date.now()})`);
        const proof = await proof_util.prove(witness_bin.buffer, this.vk_proof.buffer);
        logger.info(`proof: ${JSON.stringify(stringifyBigInts(proof))}`);

        assert(snarkjs.groth.isValid(this.verifier_key, proof, publicSignals));
        logger.info(`generating proof (ended at ${Date.now()})`);