Heroku Node.js Discord.js 部署失败答案

【问题标题】：Heroku Node.js Discord.js deployment failedHeroku Node.js Discord.js 部署失败
【发布时间】：2022-01-09 21:04:25
【问题描述】：

不知道是什么问题，不得不跟着几个 yt-bers 使用 tsc 但不得不完全切换到 js。

2022-01-09T20:58:40.370270+00:00 app[worker.1]: /app/node_modules/discord.js/src/rest/APIRequest.js:33
2022-01-09T20:58:40.370282+00:00 app[worker.1]:     agent ??= new https.Agent({ ...this.client.options.http.agent, keepAlive: true });
2022-01-09T20:58:40.370282+00:00 app[worker.1]:           ^^^
2022-01-09T20:58:40.370283+00:00 app[worker.1]: 
2022-01-09T20:58:40.370283+00:00 app[worker.1]: SyntaxError: Unexpected token '??='
2022-01-09T20:58:40.370284+00:00 app[worker.1]:     at wrapSafe (internal/modules/cjs/loader.js:1001:16)
2022-01-09T20:58:40.370284+00:00 app[worker.1]:     at Module._compile (internal/modules/cjs/loader.js:1049:27)
2022-01-09T20:58:40.370284+00:00 app[worker.1]:     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
2022-01-09T20:58:40.370285+00:00 app[worker.1]:     at Module.load (internal/modules/cjs/loader.js:950:32)
2022-01-09T20:58:40.370285+00:00 app[worker.1]:     at Function.Module._load (internal/modules/cjs/loader.js:790:12)
2022-01-09T20:58:40.370286+00:00 app[worker.1]:     at Module.require (internal/modules/cjs/loader.js:974:19)
2022-01-09T20:58:40.370286+00:00 app[worker.1]:     at require (internal/modules/cjs/helpers.js:93:18)
2022-01-09T20:58:40.370286+00:00 app[worker.1]:     at Object.<anonymous> (/app/node_modules/discord.js/src/rest/RESTManager.js:4:20)
2022-01-09T20:58:40.370287+00:00 app[worker.1]:     at Module._compile (internal/modules/cjs/loader.js:1085:14)
2022-01-09T20:58:40.370287+00:00 app[worker.1]:     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
2022-01-09T20:58:40.611984+00:00 heroku[worker.1]: State changed from up to crashed

【问题讨论】：

标签： javascript node.js heroku webpack

【解决方案1】：

SyntaxError: Unexpected token '??='

您使用的 Node.js 版本不理解 the nullish assignment operator, ??=。那个运营商was introduced at some point in the 15.x development cycle。

通过在您的package.json 中包含一个engines 部分来要求 Heroku 使用 Node 16（或更高版本），例如

{
  "name": "Some Application",
  "description": "An application that does cool stuff",
  "version": "1.0.0",
  "engines": {
    "node": "16.x"
  }
}

【讨论】：