這篇文章將為大家詳細(xì)講解有關(guān)如何解決linux下fsevents模塊引起的npm ls報(bào)錯(cuò)的問(wèn)題，文章內(nèi)容質(zhì)量較高，因此小編分享給大家做個(gè)參考，希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。

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有個(gè)項(xiàng)目在mac下開(kāi)發(fā)，安裝包npm i，一切正常；

把這個(gè)項(xiàng)目放到linux機(jī)器上，安裝包npm i，報(bào)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 fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN 0403@1.0.0 No description
npm WARN 0403@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: abbrev@1.1.1 (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: ansi-regex@2.1.1 (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: aproba@1.2.0 (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: balanced-match@1.0.0 (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: chownr@1.1.1 (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: code-point-at@1.1.0 (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'
...

執(zhí)行npm ls，有不少UNMET OPTIONAL DEPENDENCY的模塊，最后還報(bào)了一堆錯(cuò)：

│   ├── define-property@2.0.2 deduped
│   ├── extend-shallow@3.0.2 deduped
│   ├── regex-not@1.0.2 deduped
│   └─┬ safe-regex@1.1.0
│     └── ret@0.1.15
├─┬ UNMET OPTIONAL DEPENDENCY fsevents@1.2.7
│ ├── nan@2.13.2
│ └─┬ UNMET OPTIONAL DEPENDENCY node-pre-gyp@0.10.3
│   ├── UNMET OPTIONAL DEPENDENCY detect-libc@1.0.3
│   ├─┬ UNMET DEPENDENCY mkdirp@0.5.1
│   │ └── UNMET DEPENDENCY minimist@0.0.8
│   ├─┬ UNMET OPTIONAL DEPENDENCY needle@2.2.4
│   │ ├─┬ UNMET OPTIONAL DEPENDENCY debug@2.6.9
│   │ │ └── UNMET OPTIONAL DEPENDENCY ms@2.0.0
│   │ ├─┬ UNMET OPTIONAL DEPENDENCY iconv-lite@0.4.24
│   │ │ └── UNMET OPTIONAL DEPENDENCY safer-buffer@2.1.2
│   │ └── UNMET OPTIONAL DEPENDENCY sax@1.2.4
│   ├─┬ UNMET OPTIONAL DEPENDENCY nopt@4.0.1
│   │ ├── UNMET OPTIONAL DEPENDENCY abbrev@1.1.1
│   │ └─┬ UNMET OPTIONAL DEPENDENCY osenv@0.1.5
│   │   ├── UNMET OPTIONAL DEPENDENCY os-homedir@1.0.2
│   │   └── UNMET OPTIONAL DEPENDENCY os-tmpdir@1.0.2
│   ├─┬ UNMET OPTIONAL DEPENDENCY npm-packlist@1.2.0
│   │ ├─┬ UNMET OPTIONAL DEPENDENCY ignore-walk@3.0.1
│   │ │ └─┬ UNMET DEPENDENCY minimatch@3.0.4
│   │ │   └─┬ UNMET DEPENDENCY brace-expansion@1.1.11
│   │ │     ├── UNMET DEPENDENCY balanced-match@1.0.0
│   │ │     └── UNMET DEPENDENCY concat-map@0.0.1
│   │ └── UNMET OPTIONAL DEPENDENCY npm-bundled@1.0.5
│   ├─┬ UNMET OPTIONAL DEPENDENCY npmlog@4.1.2
│   │ ├─┬ UNMET OPTIONAL DEPENDENCY are-we-there-yet@1.1.5
│   │ │ ├── UNMET OPTIONAL DEPENDENCY delegates@1.0.0
│   │ │ └─┬ UNMET OPTIONAL DEPENDENCY readable-stream@2.3.6
│   │ │   ├── UNMET OPTIONAL DEPENDENCY core-util-is@1.0.2
│   │ │   ├── UNMET DEPENDENCY inherits@2.0.3
│   │ │   ├── UNMET OPTIONAL DEPENDENCY isarray@1.0.0
│   │ │   ├── UNMET OPTIONAL DEPENDENCY process-nextick-args@2.0.0
│   │ │   ├── UNMET DEPENDENCY safe-buffer@5.1.2
│   │ │   ├─┬ UNMET OPTIONAL DEPENDENCY string_decoder@1.1.1
│   │ │   │ └── UNMET DEPENDENCY safe-buffer@5.1.2
│   │ │   └── UNMET OPTIONAL DEPENDENCY util-deprecate@1.0.2
│   │ ├── UNMET DEPENDENCY console-control-strings@1.1.0
│   │ ├─┬ UNMET OPTIONAL DEPENDENCY gauge@2.7.4
│   │ │ ├── UNMET OPTIONAL DEPENDENCY aproba@1.2.0
│   │ │ ├── UNMET DEPENDENCY console-control-strings@1.1.0
│   │ │ ├── UNMET OPTIONAL DEPENDENCY has-unicode@2.0.1
│   │ │ ├── UNMET OPTIONAL DEPENDENCY object-assign@4.1.1
│   │ │ ├── UNMET OPTIONAL DEPENDENCY signal-exit@3.0.2
│   │ │ ├─┬ UNMET DEPENDENCY string-width@1.0.2
│   │ │ │ ├── UNMET DEPENDENCY code-point-at@1.1.0
│   │ │ │ ├─┬ UNMET DEPENDENCY is-fullwidth-code-point@1.0.0
│   │ │ │ │ └── UNMET DEPENDENCY number-is-nan@1.0.1
│   │ │ │ └── UNMET DEPENDENCY strip-ansi@3.0.1
│   │ │ ├─┬ UNMET DEPENDENCY strip-ansi@3.0.1
│   │ │ │ └── UNMET DEPENDENCY ansi-regex@2.1.1
│   │ │ └─┬ UNMET OPTIONAL DEPENDENCY wide-align@1.1.3
│   │ │   └── UNMET DEPENDENCY string-width@1.0.2
│   │ └── UNMET OPTIONAL DEPENDENCY set-blocking@2.0.0
│   ├─┬ UNMET OPTIONAL DEPENDENCY rc@1.2.8
│   │ ├── UNMET OPTIONAL DEPENDENCY deep-extend@0.6.0
│   │ ├── UNMET OPTIONAL DEPENDENCY ini@1.3.5
│   │ ├── UNMET OPTIONAL DEPENDENCY minimist@1.2.0
│   │ └── UNMET OPTIONAL DEPENDENCY strip-json-comments@2.0.1
│   ├─┬ UNMET OPTIONAL DEPENDENCY rimraf@2.6.3
│   │ └─┬ UNMET OPTIONAL DEPENDENCY glob@7.1.3
│   │   ├── UNMET OPTIONAL DEPENDENCY fs.realpath@1.0.0
│   │   ├─┬ UNMET OPTIONAL DEPENDENCY inflight@1.0.6
│   │   │ ├── UNMET DEPENDENCY once@1.4.0
│   │   │ └── UNMET DEPENDENCY wrappy@1.0.2
│   │   ├── UNMET DEPENDENCY inherits@2.0.3
│   │   ├── UNMET DEPENDENCY minimatch@3.0.4
│   │   ├─┬ UNMET DEPENDENCY once@1.4.0
│   │   │ └── UNMET DEPENDENCY wrappy@1.0.2
│   │   └── UNMET OPTIONAL DEPENDENCY path-is-absolute@1.0.1
│   ├── UNMET OPTIONAL DEPENDENCY semver@5.6.0
│   └─┬ UNMET OPTIONAL DEPENDENCY tar@4.4.8
│     ├── UNMET OPTIONAL DEPENDENCY chownr@1.1.1
│     ├─┬ UNMET OPTIONAL DEPENDENCY fs-minipass@1.2.5
│     │ └── UNMET DEPENDENCY minipass@2.3.5
│     ├─┬ UNMET DEPENDENCY minipass@2.3.5
│     │ ├── UNMET DEPENDENCY safe-buffer@5.1.2
│     │ └── UNMET DEPENDENCY yallist@3.0.3
│     ├─┬ UNMET OPTIONAL DEPENDENCY minizlib@1.2.1
│     │ └── UNMET DEPENDENCY minipass@2.3.5
│     ├── UNMET DEPENDENCY mkdirp@0.5.1
│     ├── UNMET DEPENDENCY safe-buffer@5.1.2
│     └── UNMET DEPENDENCY yallist@3.0.3
├─┬ glob-parent@3.1.0
│ ├─┬ is-glob@3.1.0
│ │ └── is-extglob@2.1.1 deduped
│ └── path-dirname@1.0.2
├── inherits@2.0.3
├─┬ is-binary-path@1.0.1
│ └── binary-extensions@1.13.1
├─┬ is-glob@4.0.1
│ └── is-extglob@2.1.1
├── normalize-path@3.0.0
├── path-is-absolute@1.0.1
├─┬ readdirp@2.2.1
│ ├── graceful-fs@4.1.15
│ ├── micromatch@3.1.10 deduped
│ └─┬ readable-stream@2.3.6
│   ├── core-util-is@1.0.2
│   ├── inherits@2.0.3 deduped
│   ├── isarray@1.0.0
│   ├── process-nextick-args@2.0.0
│   ├── safe-buffer@5.1.2
│   ├─┬ string_decoder@1.1.1
│   │ └── safe-buffer@5.1.2 deduped
│   └── util-deprecate@1.0.2
└── upath@1.1.2

npm ERR! missing: mkdirp@0.5.1, required by node-pre-gyp@0.10.3
npm ERR! missing: minimist@0.0.8, required by mkdirp@0.5.1
npm ERR! missing: minimatch@3.0.4, required by ignore-walk@3.0.1
npm ERR! missing: brace-expansion@1.1.11, required by minimatch@3.0.4
npm ERR! missing: balanced-match@1.0.0, required by brace-expansion@1.1.11
npm ERR! missing: concat-map@0.0.1, required by brace-expansion@1.1.11
npm ERR! missing: console-control-strings@1.1.0, required by npmlog@4.1.2
npm ERR! missing: inherits@2.0.3, required by readable-stream@2.3.6
npm ERR! missing: safe-buffer@5.1.2, required by readable-stream@2.3.6
npm ERR! missing: safe-buffer@5.1.2, required by string_decoder@1.1.1
npm ERR! missing: console-control-strings@1.1.0, required by gauge@2.7.4
npm ERR! missing: string-width@1.0.2, required by gauge@2.7.4
npm ERR! missing: strip-ansi@3.0.1, required by gauge@2.7.4
npm ERR! missing: code-point-at@1.1.0, required by string-width@1.0.2
npm ERR! missing: is-fullwidth-code-point@1.0.0, required by string-width@1.0.2
npm ERR! missing: strip-ansi@3.0.1, required by string-width@1.0.2
npm ERR! missing: number-is-nan@1.0.1, required by is-fullwidth-code-point@1.0.0
npm ERR! missing: ansi-regex@2.1.1, required by strip-ansi@3.0.1
npm ERR! missing: string-width@1.0.2, required by wide-align@1.1.3
npm ERR! missing: inherits@2.0.3, required by glob@7.1.3
npm ERR! missing: minimatch@3.0.4, required by glob@7.1.3
npm ERR! missing: once@1.4.0, required by glob@7.1.3
npm ERR! missing: once@1.4.0, required by inflight@1.0.6
npm ERR! missing: wrappy@1.0.2, required by inflight@1.0.6
npm ERR! missing: wrappy@1.0.2, required by once@1.4.0
npm ERR! missing: minipass@2.3.5, required by tar@4.4.8
npm ERR! missing: mkdirp@0.5.1, required by tar@4.4.8
npm ERR! missing: safe-buffer@5.1.2, required by tar@4.4.8
npm ERR! missing: yallist@3.0.3, required by tar@4.4.8
npm ERR! missing: minipass@2.3.5, required by fs-minipass@1.2.5
npm ERR! missing: safe-buffer@5.1.2, required by minipass@2.3.5
npm ERR! missing: yallist@3.0.3, required by minipass@2.3.5
npm ERR! missing: minipass@2.3.5, required by minizlib@1.2.1

仔細(xì)觀察發(fā)現(xiàn)UNMET OPTIONAL DEPENDENCY的模塊和npm ERR是同一批模塊，也是安裝時(shí)報(bào)warning的那些模塊。

再仔細(xì)觀察發(fā)現(xiàn)這些都是fsevents依賴的模塊。

fsevents只能在macOS下安裝，無(wú)法在linux系統(tǒng)安裝。linux下會(huì)跳過(guò)fsevents模塊，也不會(huì)安裝fsevents依賴的模塊。

這其實(shí)算是npm的一個(gè)bug，npm i時(shí)報(bào)Warn，npm ls又報(bào)Err，前后不一致，容易有誤解。

目前無(wú)論用哪個(gè)版本的npm都會(huì)有這個(gè)問(wèn)題，npm i --no-optional也不能解決這個(gè)問(wèn)題。

這些報(bào)錯(cuò)不影響項(xiàng)目的正常運(yùn)行，因?yàn)閘inux不需要fsevents。

如果不希望看到npm Err，可以用npm i -f強(qiáng)制安裝，安裝過(guò)程沒(méi)有warn，安裝完后npm ls看下：

└─┬ chokidar@2.1.5
└── fsevents@1.2.7

干凈了，沒(méi)有任何報(bào)錯(cuò)。

我的項(xiàng)目是chokidar這個(gè)模塊依賴了fsevents，chokidar又是browser-sync、webpack等依賴的。

關(guān)于如何解決linux下fsevents模塊引起的npm ls報(bào)錯(cuò)的問(wèn)題就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，可以學(xué)到更多知識(shí)。如果覺(jué)得文章不錯(cuò)，可以把它分享出去讓更多的人看到。