Most of the time, when I need to install a package as a devDependency but I forget to add --save-dev command thus this installation is final to dependency.
What I do:
"dependencies": {
    "@types/express": "^4.11.1"
},
"devDependencies": {
}
But my requirement is:
"dependencies": {
},
"devDependencies": {
    "@types/express": "^4.11.1"    
}
Now, do I need to reinstall it as devDependency or cut and paste in devDependency is OK?
