browserify -- provide instructions and best practices about solc-js

[mattiaerre]

I've been able to fix this issue w/ Jest adding the following setup in my package.json file:

"jest": {
    "testEnvironment": "node"
  }

HTH @max-block

I have the same error "Uncaught TypeError: soljson.cwrap is not a function" in my Jest test files.

Without Jest it works fine. Is there anyone who have found a solution for Jest?

[jmahhh]

So am I correct in thinking this + browserify/webpack is broken?

[axic]

I don't think this package has any specific browserify requirements.

[cofdev0]

Could you please explain what the best practice is to use solc in Jest tests?

Requiring solc in Jest tests also leads to "Uncaught TypeError: soljson.cwrap is not a function"

[axic]

I am not able to reproduce that problem. Browserify works for me locally. Are you sure you have a local soljson.js? Run npm run downloadsolc to download one.

[wighawag]

Get the same issue with jest :

in my js test file :

const solc = require('solc');

fails with:

Uncaught TypeError: soljson.cwrap is not a function

[dangell7]

I'm where you are lol.

Webpack, react redux app. This is my only hangup. Thinking about setting up an api to a server just to get the abi and bytecode for a contract. lol

[woodydeck]

Yea, can't get it to work either. Does anyone have examples of it working? I just need the bytecode, nothing else on the frontend.

I tried browser-solc, but you need to parse the results, and there is no documentation to how it actually outputs.

[GrandSchtroumpf]

Same error here. I'm in Angular (Webpack). I downloaded the soljson.js bin, and did :

const soljson = require('./soljson.js');
console.log(soljson); // Object{}

Same thing with import from :

import * as soljson from './soljson.js';  // Object{}

I saw the electron warning, but it doesn't seems relevant in this case.

[GrandSchtroumpf]

If you want to import solc in the browser you need to :

• 1 : Add that to your index.html :

    <script type="text/javascript" src="https://ethereum.github.io/solc-bin/bin/list.js"></script>
    <script type="text/javascript" src="https://ethereum.github.io/solc-bin/bin/{{ SOLC VERSION }}.js"></script>

This will load 3 global variables : soljsonSources, soljsonReleases and Module.
Note: Check the url for the version of solc you want to use here.

• 2 : Use a solc wrapper :
  By default solc uses its soljson.js inside its wrapper. I don't know why (yet), but it doesn't works in a browser. So you need to provide window.Module inside the wrapper :

import * as wrapper from 'solc/wrapper'; // OR const solc = require('solc/wrapper');

const solc = wrapper(window.Module);
const compiled = solc.compile(/* Your contract */);

If someone knows why the default soljson.js is not loaded correctly in a browser I'm curious to know why.

[axic]

@GrandSchtroumpf could you submit a README update?

[GrandSchtroumpf]

Sure. Btw, do you know why the default sol.json.js is not loaded in a browser?