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web3.min.js v1.2.2: Uncaught ReferenceError: regeneratorRuntime is not defined #3155

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gpersoon opened this issue Oct 24, 2019 · 4 comments · Fixed by #3202
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web3.min.js v1.2.2: Uncaught ReferenceError: regeneratorRuntime is not defined #3155

gpersoon opened this issue Oct 24, 2019 · 4 comments · Fixed by #3202
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1.x 1.0 related issues Bug Addressing a bug

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@gpersoon
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Description

Error "Uncaught ReferenceError: regeneratorRuntime is not defined" occurred when calling a smart contract function. The error shows in the developer console.

Expected behavior

No error
Note: with a browserified version of web3.js 1.2.1 this error doesn't occur

Actual behavior

An error is shown in the developer console

Workaround

A workaround is to include polyfill.min.js:

<script src="https://cdn.jsdelivr.net/npm/babel-polyfill/dist/polyfill.min.js"></script>

Steps to reproduce the behavior

npm install web3

Use chrome and metamask on rinkeby network to load following html page:

<html>
    <head>
        <script src=".........../node_modules/web3/dist/web3.min.js"></script>               
    </head>
<body>
<script>   
    async function asyncloaded() { 
        await ethereum.enable();
        web3 = new Web3(Web3.givenProvider);
        var ERC777ABI = [{"constant": false,"inputs": [{"internalType": "address","name": "recipient","type": "address"},{"internalType": "uint256","name": "amount","type": "uint256"},{"internalType": "bytes","name": "data","type": "bytes"}],        "name": "send","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}];
        const ERC777 = new web3.eth.Contract(ERC777ABI, "0x51a8e7fEC5639Eb6861a674E4F46148561d5c5c6");  // rinkeby
        accounts=await web3.eth.getAccounts();        
        var result = await ERC777.methods.send(accounts[0],1,"0x77").send({from: accounts[0]});
    }
    window.addEventListener('load', asyncloaded);  
    </script>     
</body>
</html>

The deployed smart contact is an ERC777 contract.

Error Logs

8inpage.js:1 Uncaught ReferenceError: regeneratorRuntime is not defined
at web3.min.js:1
at n (web3.min.js:1)
at web3.min.js:1
at Array.forEach ()
at Object.callback (web3.min.js:1)
at MetamaskInpageProvider. (web3.min.js:1)
at u (inpage.js:1)
at MetamaskInpageProvider.a.emit (inpage.js:1)
at a. (inpage.js:1)
at u (inpage.js:1)

Gists

Versions

  • web3.js: 1.2.2
  • nodejs:
  • browser: Chrome
  • ethereum node:
  • metamask 7.3.1
@nivida
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nivida commented Oct 24, 2019

Thanks for opening this issue! We have fixed this in PR #3062.

I couldn't reproduce this issue with the following steps:

  1. npm install web3

  2. Creating of HTML:

<!DOCTYPE html>
<html>
<head>
    <title>
        dapp example
    </title>
    <script src="./node_modules/web3/dist/web3.min.js">
    </script>
    <script>
      var web3 = new Web3(new Web3.providers.HttpProvider('https://rinkeby.infura.io/'));
      web3.eth.getTransaction('0xd540f813d46953f5bf7c0b3797572ff6b73eee0eeadfac071baee0da9a7a9b5a').then(console.log);
    </script>
</head>
<body></body>
</html>
  1. Testing this HTML file in Brave.

Response:

{blockHash: "0xd49d1dae2774704b27aaf41f0fd16ed84486511801c3bd82bf2065e561d4e677", blockNumber: 4817038, from: "0xa4A8C40CF200e548305001B9Af9965722c70C6AD", gas: 250000, gasPrice: "1000000000", …}blockHash: "0xd49d1dae2774704b27aaf41f0fd16ed84486511801c3bd82bf2065e561d4e677"blockNumber: 4817038from: "0xa4A8C40CF200e548305001B9Af9965722c70C6AD"gas: 250000gasPrice: "1000000000"hash: "0xd540f813d46953f5bf7c0b3797572ff6b73eee0eeadfac071baee0da9a7a9b5a"input: "0xe9c6c176000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000bf065813af0ab2ade7b29be3bdd8939ca79aad5f14a73e9f3c0aeb7e9c45d88476db1e"nonce: 180222r: "0xaf46e46b5a3248cd5eae579a72191210e0b721909b94d0e1d82e4ee3c55b4768"s: "0x44e81ed505f7024320eade3f3255b65ca773008d70af19fcfe4844cf0f0d1cb9"to: "0xA4f7E95205ac2e79b85528a0B63587bD1d5Eff78"transactionIndex: 26v: "0x1c"value: "0"__proto__: Object

@nivida nivida added 1.x 1.0 related issues more information needed labels Oct 24, 2019
@gpersoon
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@nivida I'dont understand your questions:

  • It's not really fixed because I can reproduce the issue.
  • I also tried it on Brave and have the same issue.
  • I don't see the relation with the "web3.eth.getTransaction" example.
  • The html file has to be run from a webserver for metamask to work.
  • I assume you can't reproduce the issue? Do you see any other messages?
  • If you see "Alert: Transaction error: Exception thrown in contract code", you can ignore that and still try to do the transaction; i still get the error afterwards; actually before transaction is completed.
  • I'm using windows 10

@nivida
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nivida commented Oct 24, 2019 •
edited
Loading

Now I was able to reproduce your issue. It's only on sending of a transaction and is a bug in our build pipeline. It doesn't add the required regeneratorRuntime function to the bundle. The useBuiltIns options property is missing in our build pipeline.

This:

[
  '@babel/preset-env',
  {
    useBuiltIns: 'usage'
  }
]

is missing here.

Sorry for the confusion! I thought it's more a general issue with the async/await handling of web3.js.

@nivida nivida added Bug Addressing a bug CI and removed more information needed labels Oct 24, 2019
@nivida nivida mentioned this issue Oct 25, 2019
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@pepihasenfuss
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@gpersoon Thank you for your workaround. Including the polyfill.min.js did work for me.... after a lot of pain with 1.22 and some versions before. Looking forward to a new release of web3.js.

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Fix regenerator runtime error in bundle web3/web3.js
New build pipeline web3/web3.js
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@nivida @gpersoon @pepihasenfuss