Electron forge v6.0.0-beta.57 throws errors

[will-stone]

⠋ Compiling Renderer Code
An unhandled rejection has occurred inside Forge:
TypeError: Cannot set property 'native_modules/dist/Electron.app/Contents/Frameworks/Mantle.framework/Mantle' of undefined
    at .../browserosaurus/node_modules/@marshallofsound/webpack-asset-relocator-loader/dist/index.js:14689:98
    at async Promise.all (index 98)
    at .../browserosaurus/node_modules/@marshallofsound/webpack-asset-relocator-loader/dist/index.js:14675:7

Electron Forge was terminated. Location:
{}

browserosaurus on  master [$!] is 📦 v14.4.0 via  v16.3.0 took 8s 
❯ (node:16395) electron: Failed to load URL: http://localhost:3000/main_window with error: ERR_EMPTY_RESPONSE
(Use `Electron --trace-warnings ...` to show where the warning was created)
(node:16395) UnhandledPromiseRejectionWarning: Error: ERR_EMPTY_RESPONSE (-324) loading 'http://localhost:3000/main_window'
    at rejectAndCleanup (electron/js2c/browser_init.js:213:985)
    at Object.failListener (electron/js2c/browser_init.js:213:1198)
    at Object.emit (events.js:315:20)
(node:16395) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:16395) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

As this was the only change from 56 to 57, I believe the solution lies somewhere within this issue: electron/forge#2293

[will-stone]

It seems like B doesn't use native modules, so simply removed the code and was able to upgrade to beta 58