webpackのエラーが出て詰まった話(未解決)

auです。

npmで使用しているパッケージ以外削除したいなーと思ったので色々やったら進めなくなりました・・・。

環境

macOS Catalina 10.15.5
npm 6.14.5

概要

node_moduleを綺麗にしようと調べてコマンドを打っていたらwebpack4になってしまい、エラーから抜け出せなくなった。

npm prune
npm find
npm audit fix --force // 多分これが原因?

途中途中で動くか確認するのを怠ったのも原因ですが、脆弱性が確認されているパッケージの更新をしたせいな気もします。その更新にWebpackも含まれており、こうなったと考えています。

エラー文

npm run dev

> project@1.0.0 dev /Users/username/project
> webpack-dev-server --inline --progress --config build/webpack.dev.conf.js

/Users/username/project/node_modules/copy-webpack-plugin/node_modules/schema-utils/dist/validate.js:96
    throw new _ValidationError.default(errors, schema, configuration);
    ^

ValidationError: Invalid options object. Copy Plugin has been initialized using an options object that does not match the API schema.
 - options[0] misses the property 'patterns'. Should be:
   [non-empty string | object { from, to?, context?, globOptions?, toType?, force?, flatten?, transform?, cacheTransform?, transformPath?, noErrorOnMissing? }, ...] (should not have fewer than 1 item)
    at validate (/Users/username/project/node_modules/copy-webpack-plugin/node_modules/schema-utils/dist/validate.js:96:11)
    at new CopyPlugin (/Users/username/project/node_modules/copy-webpack-plugin/dist/index.js:24:30)
    at Object.<anonymous> (/Users/username/project/build/webpack.dev.conf.js:61:5)
    at Module._compile (internal/modules/cjs/loader.js:1133:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
    at Module.load (internal/modules/cjs/loader.js:977:32)
    at Function.Module._load (internal/modules/cjs/loader.js:877:14)
    at Module.require (internal/modules/cjs/loader.js:1019:19)
    at require (internal/modules/cjs/helpers.js:77:18)
    at WEBPACK_OPTIONS (/Users/username/project/node_modules/webpack-cli/bin/utils/convert-argv.js:114:13)
    at requireConfig (/Users/username/project/node_modules/webpack-cli/bin/utils/convert-argv.js:116:6)
    at /Users/username/project/node_modules/webpack-cli/bin/utils/convert-argv.js:123:17
    at Array.forEach (<anonymous>)
    at module.exports (/Users/username/project/node_modules/webpack-cli/bin/utils/convert-argv.js:121:15)
    at Object.<anonymous> (/Users/username/project/node_modules/webpack-dev-server/bin/webpack-dev-server.js:84:40)
    at Module._compile (internal/modules/cjs/loader.js:1133:30) {
  errors: [
    {
      keyword: 'required',
      dataPath: '[0]',
      schemaPath: '#/required',
      params: [Object],
      message: "should have required property 'patterns'",
      schema: [Object],
      parentSchema: [Object],
      data: [Object],
      children: [Array]
    }
  ],
  schema: {
    definitions: { ObjectPattern: [Object], StringPattern: [Object] },
    type: 'object',
    additionalProperties: false,
    properties: { patterns: [Object], options: [Object] },
    required: [ 'patterns' ]
  },
  headerName: 'Copy Plugin',
  baseDataPath: 'options',
  postFormatter: null
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! project@1.0.0 dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the project@1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/username/.npm/_logs/2020-06-17T14_14_51_767Z-debug.log

node_modulesを入れ直したりとやってみようと思います...