The content of this article is about the solution to the npm ls error caused by the fsevents module under Linux. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
There is a project developed under mac, install the package
npm i, everything is normal; Put this project on the Linux machine, install the package npm i, and report it A bunch of warnings:
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'
... Execute npm ls, there are many UNMET OPTIONAL DEPENDENCY modules, and finally a bunch of errors were reported:
│ ├── 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
Careful observation found that the modules of UNMET OPTIONAL DEPENDENCY and npm ERR are the same batch of modules, and they are also the modules that cause warning when installed.
If you look closely, you will find that these are the modules that fsevents depends on.
fsevents can only be installed under macOS and cannot be installed on Linux systems. Under Linux, the fsevents module will be skipped, and the modules that fsevents depends on will not be installed.
This is actually a bug in npm, npm iTimes Warn, npm ls reported againErr, inconsistent and prone to misunderstanding.
Currently, no matter which version of npm is used, this problem will occur, and npm i --no-optional cannot solve this problem.
These error reports do not affect the normal operation of the project, because Linux does not require fsevents.
If you don’t want to see npm Err, you can use npm i -f to force the installation. There is no warn during the installation process. After the installation, npm ls Take a look:
└─┬ chokidar@2.1.5 └── fsevents@1.2.7
is clean, no errors are reported.
My project is chokidarThis module depends on fsevents, chokidar and browser-sync, webpack and other dependencies.
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