electron 包大小优化

减少包的体积

1. 删掉 electron Locales 目录下的用不到的语言

electron builder 打包完成后 根目录有一个 locales 语言包

这个包很大，解压后 33MB - 优化后可以到 1.53MB

根据你软件所需要的语言即可，一般我们只要英文和中文

参考

• electron 官网 http://man.hubwiz.com/docset/electron.docset/Contents/Resources/Documents/docs/api/locales.html
• github issues https://github.com/electron/electron/issues/18738#issuecomment-511704668
• electron builder https://www.electron.build/configuration/configuration#afterpack

具体代码如下：

1. 项目根目录创建一个 removeLocales.js 文件， 内容如下

// removeLocales.js
/**
 * 移除部分用不到的语言、优化electron包的大小
 */

exports.default = async function (context) {
  const fs = require("fs");
  const localeDir = context.appOutDir + "/locales/";

  fs.readdir(localeDir, function (err, files) {
    //files is array of filenames (basename form)
    if (!(files && files.length)) return;
    for (let i = 0, len = files.length; i < len; i++) {
      // zh 和 en 开头的都不删
      if (!(files[i].startsWith("en") || files[i].startsWith("zh"))) {
        fs.unlinkSync(localeDir + files[i]);
      }
    }
  });
};

2. package.json build electron builder 配置如下

{
  "build": {
    "afterPack": "./removeLocales.js",
    "artifactName": "videovlc-${os}-${arch}-${version}.${ext}",
    "win": {
      "target": "nsis"
    },
    "nsis": {
      "oneClick": false,
      "allowToChangeInstallationDirectory": true,
      "deleteAppDataOnUninstall": true
    },
    "extraResources": [
      {
        "from": "./vlc-3.0.9.2",
        "to": "vlc-3.0.9.2",
        "filter": [
          "**/*",
          "!locale/**",
          "!skins/**",
          "!lua/**",
          "!msi/**",
          "!**/*.txt",
          "!**/*.TXT",
          "!**/*.html",
          "!**/*.md",
          "!*.exe",
          "!**/*.ico",
          "!languages/**"
        ]
      },
      {
        "from": "./bin",
        "to": "bin"
      }
    ],
    "files": [
      "**/*",
      "!bin/**/*",
      "!build/**/*",
      "!vlc-3.0.9.2/**/*",
      "!path_to_some_media_file.mp4"
    ]
  },
  "devDependencies": {
    "electron": "^26.2.4",
    "electron-builder": "^24.6.4"
  }
}