electron-builder with browserWindow and preload.js. Unable to load preload script

user_5774128 0
Viewed 15071

i`ve a problem with electron-builder and the browserWindows preload option in my main.js:

// Create the browser window.
  mainWindow = new BrowserWindow({
    x: mainWindowState.x,
    y: mainWindowState.y,
    width: mainWindowState.width,
    height: mainWindowState.height,
    minHeight: 500,
    minWidth: 1000,
    icon: path.join(__dirname, 'icon.ico'),
    frame: false,
    webPreferences: {
      preload: path.resolve(__dirname, 'preload.js'), // <--- PROBLEM
      nativeWindowOpen: true,
      spellcheck: true,
      nodeIntegration: false
    }
  });

after starting the packaged app i get the following error:

Unable to load preload script: C:\Users[...]\resources\app.asar\preload.js

The preload.js is in the same directory as the main.js.

Any ideas to solve this problem?

with kind regards, kai W.

electron-builder electron preload
6 Answers
webPreferences: {
                    frame: false,
                    nodeIntegration: true,
                    enableRemoteModule: true, //this must be true
                    preload: path.resolve(root, 'bridge', 'initialize.js'), 
                }

Unable to load preload script, but actually something was wrong with the initialize.js. in my file, has an error that remote.getGlobal is undefined, because this webPreferences.enableRemoteModule's default value is false at the version 10.x, so u must set it with true. then it will work good.

user_145884350 
"extraResources": [
  "src/main/preload.js",
  "src/electron-actions/*,"
]

did the trick in my case!

user_57741280

Today I migrated from electron 9.x to 13.1.9. Those solutions didn't help me. My desision:

  1. preload file path: ./src/public/preload.js
  2. background.js
  win = new BrowserWindow({
    width: 800,
    height: 600,
    minHeight: 300,
    minWidth: 500,
    webPreferences: {
      preload: path.join(__static, 'preload.js'), // <- static
    },
  });

How does it work?

All files from ./src/public are just copied to the build folder. But after electron:serve and electron:build - build folders have differed structure. And you (or it's only my case) can't use __dirname. So need to use __static

P.s. About __static: https://webpack.electron.build/using-static-assets

P.s. Another example __static for electron:

protocol.registerSchemesAsPrivileged([{
  scheme: 'app',
  privileges: {
    secure: true,
    standard: true,
    icon: path.join(__static, 'icon.png'), // <- this
  },
}]);

They helped me to find a solution (use public folder): https://mmazzarolo.medium.com/building-a-desktop-application-using-electron-and-create-react-app-2b6d127f4fd7

user_66673210

Add the preload.js file inside files config like this:

 "build": {
    "files": [
      "./src/preload.js"
    ]
}
user_65854760

Sorry for the late answer. For me, what worked was:

preload.js location

static
  |- preload.js

main/index.js

win = new BrowserWindow({
  width: 800,
  height: 600,
  minHeight: 300,
  minWidth: 500,
  webPreferences: {
    preload: path.resolve(getElectronApp().getAppPath(), 'preload.js'),
  },
});

And package.json (electron-webpack)

"electronWebpack": {
  "main": {
    "extraEntries": [
      "./static/preload.js"
    ],
  },
}
user_106007780
user_133613280
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