npm install mysql删除其他50个node_modules包？

当我在Fedora 27上运行（npm install mysql）命令时，这个命令删除程序中需要的其他50个node_modules包，并添加3个mysql包？ 这是为什么？

[jatinverma95@jatinverma95 DP]$ npm install mysql npm notice created a lockfile as package-lock.json. You should commit this file. npm WARN questionnaire@1.0.0 No description npm WARN questionnaire@1.0.0 No repository field. + mysql@2.15.0 added 3 packages and removed 50 packages in 2.498s [jatinverma95@jatinverma95 DP]$ git status On branch sql_implemntation Changes not staged for commit: (use "git add/rm <file>..." to update what will be committed) (use "git checkout -- <file>..." to discard changes in working directory) deleted: node_modules/.bin/sshpk-conv deleted: node_modules/.bin/sshpk-sign deleted: node_modules/.bin/sshpk-verify deleted: node_modules/.bin/uuid deleted: node_modules/ajv/.tonic_example.js deleted: node_modules/ajv/LICENSE deleted: node_modules/ajv/README.md deleted: node_modules/ajv/dist/ajv.bundle.js deleted: node_modules/ajv/dist/ajv.min.js deleted: node_modules/ajv/dist/ajv.min.js.map deleted: node_modules/ajv/dist/nodent.min.js deleted: node_modules/ajv/dist/regenerator.min.js deleted: node_modules/ajv/lib/$data.js deleted: node_modules/ajv/lib/ajv.d.ts 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npm安装mysql

删除包-1

删除的软件包-2

删除包3

删除包-4

删除包5

运行app.js的结果

[jatinverma

 95@jatinverma95 DP]$ node app.js module.js:538 throw err; ^ Error: Cannot find module 'request' at Function.Module._resolveFilename (module.js:536:15) at Function.Module._load (module.js:466:25) at Module.require (module.js:579:17) at require (internal/module.js:11:18) at /home/jatinverma95/Jatin/DP/routes/datasets.js:10:15 at Object.<anonymous> (/home/jatinverma95/Jatin/DP/routes/datasets.js:244:3) at Module._compile (module.js:635:30) at Object.Module._extensions..js (module.js:646:10) at Module.load (module.js:554:32) at tryModuleLoad (module.js:497:12) 

编辑1：package.json（ package.json图片 ）

 { "name": "questionnaire", "version": "1.0.0", "description": "", "main": "app.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "", "license": "ISC", "dependencies": { "body-parser": "^1.15.2", "cookie-parser": "^1.4.3", "express": "^4.14.0", "handlebars": "^4.0.5", "mssql": "^3.3.0" } }