error 3a contextbridge api can only be used when contextisolation is enabled

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Marvin
28 Feb 2016
1<!doctype html>
2<html lang="en-US">
3<head>
4    <meta charset="utf-8"/>
5    <title>Title</title>
6</head>
7<body>
8    <script>
9        window.api.receive("fromMain", (data) => {
10            console.log(`Received ${data} from main process`);
11        });
12        window.api.send("toMain", "some data");
13    </script>
14</body>
15</html>
16
source
Anna
03 Oct 2017
1const {
2  app,
3  BrowserWindow,
4  ipcMain
5} = require("electron");
6const path = require("path");
7const fs = require("fs");
8
9// Keep a global reference of the window object, if you don't, the window will
10// be closed automatically when the JavaScript object is garbage collected.
11let win;
12
13async function createWindow() {
14
15  // Create the browser window.
16  win = new BrowserWindow({
17    width: 800,
18    height: 600,
19    webPreferences: {
20      nodeIntegration: false, // is default value after Electron v5
21      contextIsolation: true, // protect against prototype pollution
22      enableRemoteModule: false, // turn off remote
23      preload: path.join(__dirname, "preload.js") // use a preload script
24    }
25  });
26
27  // Load app
28  win.loadFile(path.join(__dirname, "dist/index.html"));
29
30  // rest of code..
31}
32
33app.on("ready", createWindow);
34
35ipcMain.on("toMain", (event, args) => {
36  fs.readFile("path/to/file", (error, data) => {
37    // Do something with file contents
38
39    // Send result back to renderer process
40    win.webContents.send("fromMain", responseObj);
41  });
42});
43
source
Ali
20 Apr 2017
1const {
2    contextBridge,
3    ipcRenderer
4} = require("electron");
5
6// Expose protected methods that allow the renderer process to use
7// the ipcRenderer without exposing the entire object
8contextBridge.exposeInMainWorld(
9    "api", {
10        send: (channel, data) => {
11            // whitelist channels
12            let validChannels = ["toMain"];
13            if (validChannels.includes(channel)) {
14                ipcRenderer.send(channel, data);
15            }
16        },
17        receive: (channel, func) => {
18            let validChannels = ["fromMain"];
19            if (validChannels.includes(channel)) {
20                // Deliberately strip event as it includes `sender` 
21                ipcRenderer.on(channel, (event, ...args) => func(...args));
22            }
23        }
24    }
25);
26
source
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