当我在Fedora 27上运行（npm install mysql）命令时，此命令删除了程序中所需的其他50个node_modules包。并添加了3个mysql包？那是为什么？
[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)
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modified: package.json
Untracked files:
(use "git add <file>..." to include in what will be committed)
node_modules/bignumber.js/
node_modules/mysql/
node_modules/sqlstring/
package-lock.json
no changes added to commit (use "git add" and/or "git commit -a")
[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 Image）
{
"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"
}
}