How to pass an argument to electron when using electron-builder?

Question

I'm building an application with Electron and packaging with Electron Builder. When running electron, I want to pass this command line argument: --enable-mixed-sandbox.

Is it possible? How?

This:

 app.commandLine.appendSwitch('enable-mixed-sandbox')

wouldn't work due to:

Note that it is not enough to call app.commandLine.appendSwitch('--enable-sandbox'), as electron/node startup code runs after it is possible to make changes to chromium sandbox settings. The switch must be passed to electron on the command-line:

electron --enable-sandbox app.js

It is not possible to have the OS sandbox active only for some renderers, if --enable-sandbox is enabled, normal electron windows cannot be created.

Answer 1

enable-mixed-sandbox is not a valid Electron command line flag. See here for all available command line flags for Electron.

Answer 2

I got a response on that issue I raised and linked to in the comments:

app.enableMixedSandbox() // Experimental macOS Windows

See here for documentation.

Answer 3

another way of doing it, you can use spectron to start the app in debug mode. which allows you to pass any arguments you want.

const Application = require('spectron').Application

// Returns a promise that resolves to a Spectron Application once the app has loaded.
// Takes a Ava test. Makes some basic assertions to verify that the app loaded correctly.
function createApp (t) {
  return new Application({
    path: 'path/to/app',
    args: ['-r', '--enable-mixed-sandbox'],
    env: {NODE_ENV: 'test'},
    waitTimeout: 10e3
  })
}

https://github.com/electron/spectron#new-applicationoptions