Error signing permit: TypeError: Do not know how to serialize a BigInt

[AmazingAng]

Ethers Version

6.2.3

Search Terms

wallet, signTypedData

Describe the Problem

I met the following error when signing eip712 typed data with ethers.js v6:

Error signing permit: TypeError: Do not know how to serialize a BigInt

Code Snippet

async function signPermit() {
      const tokenAddress = "0x3317AD9eDa6942b5a7BE5BA83346C0Ea82C3C26C"; // Replace with your deployed ERC20Permit token contract address
      const chainId = 1; // Replace with the appropriate chain ID
      const tokenName = "MyToken"; // Replace with your token name
      const version = "1";
      const spender = "0x3317AD9eDa6942b5a7BE5BA83346C0Ea82C3C26C"; // Replace with the spender's address
      const value = ethers.parseUnits("10", 18); // Replace with the desired allowance value
      
      const provider = new ethers.BrowserProvider(window.ethereum)
      const signer = await provider.getSigner()
      const owner = await signer.getAddress();
      const nonce = 0; // Replace with the actual nonce for the owner
      const deadline = Math.floor(Date.now() / 1000) + 60 * 60 * 24; // 24 hours from now

      const domain = {
        name: tokenName,
        version: version,
        chainId: chainId,
        verifyingContract: tokenAddress,
      };

      const types = {
        Permit: [
          { name: "owner", type: "address" },
          { name: "spender", type: "address" },
          { name: "value", type: "uint256" },
          { name: "nonce", type: "uint256" },
          { name: "deadline", type: "uint256" },
        ],
      };

      const message = {
        owner: owner,
        spender: spender,
        value: value.toString(),
        nonce: nonce,
        deadline: deadline,
      };

      try {
        console.log(message)
        const signature = await signer.signTypedData(domain, types, message);
        console.log("Signature:", signature);
      } catch (error) {
        console.error("Error signing permit:", error);
      }
    }

Contract ABI

No response

Errors

Error signing permit: TypeError: Do not know how to serialize a BigInt

Environment

node.js (v12 or newer)

Environment (Other)

No response

[ricmoo]

This was fixed in v6.3.0, see #3836 for more info. :)

[elranu]

Hi,
I still have it with Next.js
here is the repo to reproduce it: https://github.com/elranu/next-ethers/
code:
https://github.com/elranu/next-ethers/blob/main/src/app/info/route.ts

any idea why?? @ricmoo

[elranu]

I have fix it with the following workaround: https://github.com/letoxyz/api-example/blob/main/src/patch.ts

[AmazingAng]

I have fix it with the following workaround: https://github.com/letoxyz/api-example/blob/main/src/patch.ts

Use ethers > 6.3.0
You are using 6.2.3

[elranu]

I have fix it with the following workaround: https://github.com/letoxyz/api-example/blob/main/src/patch.ts

Use ethers > 6.3.0 You are using 6.2.3

If you check the link of my first post you will see is 6.7.1. (https://github.com/elranu/next-ethers/blob/main/package.json) The other link is just the code I use to do a workaround. @AmazingAng

[serinuntius]

I have fix it with the following workaround: https://github.com/letoxyz/api-example/blob/main/src/patch.ts

Use ethers > 6.3.0 You are using 6.2.3

If you check the link of my first post you will see is 6.7.1. (https://github.com/elranu/next-ethers/blob/main/package.json) The other link is just the code I use to do a workaround. @AmazingAng

Same Problems. I used 6.7.1

[serinuntius]

I have fix it with the following workaround: https://github.com/letoxyz/api-example/blob/main/src/patch.ts

Use ethers > 6.3.0 You are using 6.2.3

If you check the link of my first post you will see is 6.7.1. (https://github.com/elranu/next-ethers/blob/main/package.json) The other link is just the code I use to do a workaround. @AmazingAng

Same Problems. I used 6.7.1

I'm sorry! My problem was another issue.

jestjs/jest#11617 (comment)