详解linux下fsevents模块引起的npm ls报错解决办法

详解linux下fsevents模块引起的npm ls报错解决办法

有个项目在mac下开发，安装包npm i，一切正常；

把这个项目放到linux机器上，安装包npm i，报了一堆warning：

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN [email protected] No description
npm WARN [email protected] No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/abbrev):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/root/2019/0403/node_modules/fsevents/node_modules/abbrev' -> '/root/2019/0403/node_modules/fsevents/node_modules/.abbrev.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/ansi-regex):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/root/2019/0403/node_modules/fsevents/node_modules/ansi-regex' -> '/root/2019/0403/node_modules/fsevents/node_modules/.ansi-regex.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/aproba):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/root/2019/0403/node_modules/fsevents/node_modules/aproba' -> '/root/2019/0403/node_modules/fsevents/node_modules/.aproba.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/balanced-match):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/root/2019/0403/node_modules/fsevents/node_modules/balanced-match' -> '/root/2019/0403/node_modules/fsevents/node_modules/.balanced-match.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/chownr):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/root/2019/0403/node_modules/fsevents/node_modules/chownr' -> '/root/2019/0403/node_modules/fsevents/node_modules/.chownr.DELETE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents/node_modules/code-point-at):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, rename '/root/2019/0403/node_modules/fsevents/node_modules/code-point-at' -> '/root/2019/0403/node_modules/fsevents/node_modules/.code-point-at.DELETE'
...

执行npm ls，有不少UNMET OPTIONAL DEPENDENCY的模块，最后还报了一堆错：

│  ├── [email protected] deduped
│  ├── [email protected] deduped
│  ├── [email protected] deduped
│  └─┬ [email protected]
│   └── [email protected]
├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│ ├── [email protected]
│ └─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├─┬ UNMET DEPENDENCY [email protected]
│  │ └── UNMET DEPENDENCY [email protected]
│  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ └── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ └── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ └── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ └─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │  └── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ └─┬ UNMET DEPENDENCY [email protected]
│  │ │  └─┬ UNMET DEPENDENCY [email protected]
│  │ │   ├── UNMET DEPENDENCY [email protected]
│  │ │   └── UNMET DEPENDENCY [email protected]
│  │ └── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ └─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │  ├── UNMET DEPENDENCY [email protected]
│  │ │  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │  ├── UNMET DEPENDENCY [email protected]
│  │ │  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │  │ └── UNMET DEPENDENCY [email protected]
│  │ │  └── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├── UNMET DEPENDENCY [email protected]
│  │ ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ ├── UNMET DEPENDENCY [email protected]
│  │ │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │ ├─┬ UNMET DEPENDENCY [email protected]
│  │ │ │ ├── UNMET DEPENDENCY [email protected]
│  │ │ │ ├─┬ UNMET DEPENDENCY [email protected]
│  │ │ │ │ └── UNMET DEPENDENCY [email protected]
│  │ │ │ └── UNMET DEPENDENCY [email protected]
│  │ │ ├─┬ UNMET DEPENDENCY [email protected]
│  │ │ │ └── UNMET DEPENDENCY [email protected]
│  │ │ └─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ │  └── UNMET DEPENDENCY [email protected]
│  │ └── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │ └── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │ └─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  │  ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│  │  │ ├── UNMET DEPENDENCY [email protected]
│  │  │ └── UNMET DEPENDENCY [email protected]
│  │  ├── UNMET DEPENDENCY [email protected]
│  │  ├── UNMET DEPENDENCY [email protected]
│  │  ├─┬ UNMET DEPENDENCY [email protected]
│  │  │ └── UNMET DEPENDENCY [email protected]
│  │  └── UNMET OPTIONAL DEPENDENCY [email protected]
│  ├── UNMET OPTIONAL DEPENDENCY [email protected]
│  └─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│   ├── UNMET OPTIONAL DEPENDENCY [email protected]
│   ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│   │ └── UNMET DEPENDENCY [email protected]
│   ├─┬ UNMET DEPENDENCY [email protected]
│   │ ├── UNMET DEPENDENCY [email protected]
│   │ └── UNMET DEPENDENCY [email protected]
│   ├─┬ UNMET OPTIONAL DEPENDENCY [email protected]
│   │ └── UNMET DEPENDENCY [email protected]
│   ├── UNMET DEPENDENCY [email protected]
│   ├── UNMET DEPENDENCY [email protected]
│   └── UNMET DEPENDENCY [email protected]
├─┬ [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected] deduped
│ └── [email protected]
├── [email protected]
├─┬ [email protected]
│ └── [email protected]
├─┬ [email protected]
│ └── [email protected]
├── [email protected]
├── [email protected]
├─┬ [email protected]
│ ├── [email protected]
│ ├── [email protected] deduped
│ └─┬ [email protected]
│  ├── [email protected]
│  ├── [email protected] deduped
│  ├── [email protected]
│  ├── [email protected]
│  ├── [email protected]
│  ├─┬ [email protected]
│  │ └── [email protected] deduped
│  └── [email protected]
└── [email protected]

npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]
npm ERR! missing: [email protected], required by [email protected]

仔细观察发现UNMET OPTIONAL DEPENDENCY的模块和npm ERR是同一批模块，也是安装时报warning的那些模块。

再仔细观察发现这些都是fsevents依赖的模块。

fsevents只能在macOS下安装，无法在linux系统安装。linux下会跳过fsevents模块，也不会安装fsevents依赖的模块。

这其实算是npm的一个bug，npm i时报Warn，npm ls又报Err，前后不一致，容易有误解。

目前无论用哪个版本的npm都会有这个问题，npm i --no-optional也不能解决这个问题。

这些报错不影响项目的正常运行，因为linux不需要fsevents。

如果不希望看到npm Err，可以用npm i -f强制安装，安装过程没有warn，安装完后npm ls看下：

└─┬ [email protected]
└── [email protected] 

干净了，没有任何报错。

我的项目是chokidar这个模块依赖了fsevents，chokidar又是browser-sync、webpack等依赖的。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。