问题描述

我制作了一个需要加载预加载 js 文件的小型 Electron 应用程序.

I've made a small Electron app which needs to load a preload js file.

当我用 electron . 启动应用程序时，它会找到该文件，但是当应用程序被打包时，它不会.

When I start the app with electron ., it finds the file, but when the app is packaged, it doesn't.

在此处拨打电话:

mainWindow = new BrowserWindow({
   width: 800,
   height: 600,
   webPreferences: {
     nodeIntegration: false, 
     nativeWindowOpen: true,
     webSecurity: false,
     preload: path.join(__dirname, 'preload.js')  
  }
})

我的简化 package.json:

My simplified package.json:

"name": "app",
"version": "1.0.0",
"main": "main.js",
"scripts": {
  "start": "electron .",
  "build": "electron-packager . --platform=win32 --arch=x64 --overwrite"
 }
"devDependencies": {
  "electron": "^1.8.4",
  "electron-packager": "^12.0.1",
}

我的项目结构:

- 节点模块

- main.js

- preload.js

- preload.js

- package.json

- package.json

我检查了 path.join 的结果，在这两种情况下，路径都是正确的，并且文件在那里.

I've checked the result of the path.join and in both cases, the path is correct, and the file is there.

推荐答案

对于使用 Electron Forge webpack typescript 样板的人们:

For peoples using Electron Forge webpack typescript boilerplate :

1. 在 package.json 文件中添加 preload 键:

1. Add the preload key in package.json file:

{
  "config": {
    "forge": {
      "plugins": [
        [
          "@electron-forge/plugin-webpack",
          {
            "mainConfig": "./webpack.main.config.js",
            "renderer": {
              "config": "./webpack.renderer.config.js",
              "entryPoints": [
                {
                  "html": "./src/index.html",
                  "js": "./src/renderer.tsx",
                  "name": "main_window",
                  "preload": {
                    "js": "./src/preload.ts"
                  }
                }
              ]
            }
          }
        ]
      ]
    }
  }
}

预加载脚本可以是打字稿文件.

Preload script can be a typescript file.

1. 添加 MAIN_WINDOW_PRELOAD_WEBPACK_ENTRY 常量作为 preload 的值:

1. Add MAIN_WINDOW_PRELOAD_WEBPACK_ENTRY constant as value for preload:

// Tell typescript about this magic constant
declare const MAIN_WINDOW_PRELOAD_WEBPACK_ENTRY: any;

// [...]

  const mainWindow = new BrowserWindow({
    height: 1000,
    width: 1500,
    webPreferences: {
      preload:  MAIN_WINDOW_PRELOAD_WEBPACK_ENTRY,
    }
  });

1. 在 preload.ts 中写:

import {
  contextBridge,
  ipcRenderer
} from 'electron';

contextBridge.exposeInMainWorld(
  'electron',
  {
    doThing: () => ipcRenderer.send('do-a-thing')
  }
)

1. 添加index.d.ts文件，写入:

1. Add index.d.ts file, write :

declare global {
  interface Window {
    electron: {
      doThing(): void;
    }
  }
}

1. 启动您的应用程序，在您的开发控制台中您可以输入 electron 并查看它的定义.

奖励:为 contextBridge 公开的 API 正确输入:

BONUS: getting the typing right for the contextBridge exposed API:

为什么要分开 fie ?不确定是否需要，但我不希望在渲染器进程中从包含主进程代码(如 preload.ts)的文件中导入接口.

Why a separated fie ? Not sure if needed, but I prefer not having to import an interface from a file that contain main process code (like preload.ts) in renderer process.

// exposed-main-api.model.ts

export interface ExposedMainAPI {
  doThat(data: string): Promise<number>;
}

// index.d.ts

declare global {
  interface Window {
    electron: ExposedMainAPI
  }
}

// preload.ts
import {
  contextBridge,
  ipcRenderer
} from 'electron';

const exposedAPI: ExposedAPI = {
  // You are free to omit parameters typing and return type if you feel so.
  // TS know the function type thanks to exposedAPI typing. 
  doThat: (data) => ipcRenderer.invoke('do-that-and-return-promise', data)
};
// note: this assume you have a `ipcMain.handle('do-thing-and-return-promise', ...)` 
// somewhere that return a number.

contextBridge.exposeInMainWorld('electron', exposedAPI);

学分:

• @deadcoder0904 在 评论 对于以前的答案，这是他链接的 github 问题:https://github.com/electron-userland/electron-forge/issues/1590
• index.d.ts 输入和 contextBridge 的小示例用法:https://github.com/electron/electron/issues/9920#issuecomment-743803249

• @deadcoder0904 that gave us the solution in an comment to a previous answer, here is the github issue he link : https://github.com/electron-userland/electron-forge/issues/1590
• index.d.ts typing and small example usage of contextBridge: https://github.com/electron/electron/issues/9920#issuecomment-743803249

另见:

• 关于安全性的说明以及使用 IPC 的示例:https://github.com/electron/electron/issues/9920#issuecomment-575839738

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