`sudo rm -rf node_modules`

npm lsでエラーが出るとき

```bash
ex.

/Users/cometqp
├── vue@2.6.10
├── UNMET PEER DEPENDENCY webpack@^2.0.0 || ^3.0.0 || ^4.0.0
└─┬ workbox-webpack-plugin@4.1.1
  ├─┬ @babel/runtime@7.4.2
  │ └── regenerator-runtime@0.13.2
  ├─┬ json-stable-stringify@1.0.1
  │ └── jsonify@0.0.0
  └─┬ workbox-build@4.1.1
    ├── @babel/runtime@7.4.2 deduped
    ├── common-tags@1.8.0
    ├─┬ fs-extra@4.0.3
    │ ├── graceful-fs@4.1.15
    │ ├─┬ jsonfile@4.0.0
    │ │ └── graceful-fs@4.1.15 deduped
    │ └── universalify@0.1.2
    ├─┬ glob@7.1.3
    │ ├── fs.realpath@1.0.0
    │ ├─┬ inflight@1.0.6
    │ │ ├── once@1.4.0 deduped
    │ │ └── wrappy@1.0.2
    │ ├── inherits@2.0.3
    │ ├─┬ minimatch@3.0.4
    │ │ └─┬ brace-expansion@1.1.11
    │ │   ├── balanced-match@1.0.0
    │ │   └── concat-map@0.0.1
    │ ├─┬ once@1.4.0
    │ │ └── wrappy@1.0.2 deduped
    │ └── path-is-absolute@1.0.1
    ├─┬ joi@14.3.1
    │ ├── hoek@6.1.2
    │ ├─┬ isemail@3.2.0
    │ │ └── punycode@2.1.1
    │ └─┬ topo@3.0.3
    │   └── hoek@6.1.2 deduped
    ├─┬ lodash.template@4.4.0
    │ ├── lodash._reinterpolate@3.0.0
    │ └─┬ lodash.templatesettings@4.1.0
    │   └── lodash._reinterpolate@3.0.0 deduped
    ├── pretty-bytes@5.1.0
    ├─┬ stringify-object@3.3.0
    │ ├── get-own-enumerable-property-symbols@3.0.0
    │ ├── is-obj@1.0.1
    │ └── is-regexp@1.0.0
    ├─┬ strip-comments@1.0.2
    │ ├─┬ babel-extract-comments@1.0.0
    │ │ └── babylon@6.18.0
    │ └─┬ babel-plugin-transform-object-rest-spread@6.26.0
    │   ├── babel-plugin-syntax-object-rest-spread@6.13.0
    │   └─┬ babel-runtime@6.26.0
    │     ├── core-js@2.6.5
    │     └── regenerator-runtime@0.11.1 extraneous
    ├─┬ workbox-background-sync@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-broadcast-update@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-cacheable-response@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├── workbox-core@4.1.1
    ├─┬ workbox-expiration@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-google-analytics@4.1.1
    │ ├── workbox-background-sync@4.1.1 deduped
    │ ├── workbox-core@4.1.1 deduped
    │ ├── workbox-routing@4.1.1 deduped
    │ └── workbox-strategies@4.1.1 deduped
    ├─┬ workbox-navigation-preload@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-precaching@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-range-requests@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-routing@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-strategies@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├─┬ workbox-streams@4.1.1
    │ └── workbox-core@4.1.1 deduped
    ├── workbox-sw@4.1.1
    └─┬ workbox-window@4.1.1
      └── workbox-core@4.1.1 deduped

npm ERR! peer dep missing: webpack@^2.0.0 || ^3.0.0 || ^4.0.0, required by workbox-webpack-plugin@4.1.1
npm ERR! extraneous: regenerator-runtime@0.11.1 /Users/cometqp/node_modules/babel-runtime/node_modules/regenerator-runtime
```