TypeError: Cannot read properties of undefined (reading 'call') on build but not dev

Question

I am running a vite.js app with web3 installed. When I run the app in dev mode, all works fine but when I run it in production mode (build) it fails with: "TypeError: Cannot read properties of undefined (reading 'call')".

I can confirm that the error comes from the contract method generated from my ABI: contract.methods.isOwner(sender).call({from: sender}, function (err, res)

If I comment this line out I wont get the error.

You can reproduce the error by using my test repo: download my test repo: https://github.com/nybroe/web3_vite_call_of_undefined/tree/main

follow the readme with repo steps:

setup:

download the repro
navigate to "app"
npm install

dev test (which works)

npm run dev
check the console - no errors

build test (which breaks)

npm run build
npm run preview
check the console - you will see the following errors: "TypeError: Cannot read properties of undefined (reading 'call')"

tony19 · Accepted Answer · 2022-04-28 21:39:45Z

3

https://stackoverflow.com/a/69021714

I use the option 2

In your vite.config.js, add web3:

import { defineConfig } from 'vite'

export default defineConfig({
  ⋮
  resolve: {
    alias: {
      web3: 'web3/dist/web3.min.js',
    },

    // or
    alias: [
      {
        find: 'web3',
        replacement: 'web3/dist/web3.min.js',
      },
    ],
  },
})

edited Apr 28, 2022 at 21:39

tony19

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answered Apr 28, 2022 at 18:33

Ab B

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