安装全局 npm 包后出现“错误：ENOENT：没有这样的文件或目录”

Question

我刚刚将我的第一个 Node.js CLI 工具包 youtube-playlist-export 发布到 npm，但是当我尝试通过将它安装到本地计算机来测试我的包时，它给出了“错误：ENOENT：没有这样的文件或目录”警告。

复制步骤

首先，打开终端，当前直接工作的应该是主文件夹。

接下来，全局安装包：

$ npm install -g youtube-playlist-export

added 397 packages, and audited 398 packages in 18s

67 packages are looking for funding
  run `npm fund` for details

10 moderate severity vulnerabilities

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.

最后，运行 ytpl-export 命令开始运行 CLI 应用程序。它会给出“错误：ENOENT：没有这样的文件或目录”警告。

$ ytpl-export
(node:4632) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open 'C:\Users\User\package.json'
(Use `node --trace-warnings ...` to show where the warning was created)
(node:4632) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:4632) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

附加信息

这是project repository的简要结构：

.
├── source/
│   ├── cli.js
│   └── ...
├── tests/
└── package.json

在package.json 中，我将"bin" 字段定义为具有"ytpl-export" 属性的对象，其字段为"./source/cli.js"。这会在终端中注册 ytpl-export 命令，以便它运行我的 CLI 应用程序。

{
  "name": "youtube-playlist-export",
  "version": "1.0.2",
  "engines": {
    "node": ">=12"
  },
  "files": [
    "source"
  ],
  "bin": {
    "ytpl-export": "./source/cli.js"
  }
}

这里是源代码source/cli.js：

#!/usr/bin/env node

import c from "chalk";
import { program } from "commander";
import { readPackage } from "read-pkg";
import updateNotifier from "update-notifier";
import idActionHandler from "./commands/id.js";
import keyActionHandler from "./commands/key.js";
import configActionHandler from "./commands/config.js";

(async () => {
  const pkg = await readPackage();

  updateNotifier({ pkg }).notify();

  program.name("ytpl-export").version(pkg.version);

  program.addHelpText("before", "Exports video data from a YouTube playlist to JSON/CSV file.\n");

  program
    .command("id")
    .description("Export video metadata of a playlist by its playlist ID.")
    .argument(
      "<playlistId>",
      // prettier-ignore
      `The value of the "list" parameter in the the playlist homepage URL (https://www.youtube.com/playlist?list=${c.greenBright("[playlistId]")})`
    )
    .option("-d, --default", "Skip all questions and use the default config")
    .addHelpText(
      "after",
      `
Example:
 $ ytpl-export id PLBCF2DAC6FFB574DE 
    `
    )
    .action(idActionHandler);

  program.command("key").description("Manage your YouTube API key.").action(keyActionHandler);

  program
    .command("config")
    .description("Edit configurations of this app.")
    .option("-p, --path", "show the path of the config file")
    .option("-r, --reset", "reset all configurations to default")
    .action(configActionHandler);

  program.parse(process.argv);
})();

Answer 1

问题原因

感谢Darth的评论，这个问题是由cli.js中的const pkg = await readPackage();这一行引起的：

#!/usr/bin/env node

import { readPackage } from "read-pkg";
/* ... */

(async () => {
  const pkg = await readPackage();  // THIS LINE
  /* ... */
})();

根据read-pkg's documentation，如果我们不为readPackage()提供cwd选项，cwd的默认值为process.cwd()（当前工作目录）。由于我在主目录中运行ytpl-export，readPackage() 会尝试读取主目录中的package.json，但并不存在。

解决方案

1. 安装get-installed-path，一个返回模块安装路径的包到项目中：

$ yarn add get-installed-path

1. 编辑cli.js，使readPackage() 将读取安装路径中的package.json 文件：

#!/usr/bin/env node

import { getInstalledPath } from "get-installed-path";
import { readPackage } from "read-pkg";
/* ... */

(async () => {
  const installedPath = await getInstalledPath("youtube-playlist-export");
  const pkg = await readPackage({ cwd: installedPath });
  /* ... */
})();