should you push package-lock.json code example

Example 1: how to generate package-lock.json from package.json

Have you deleted package-lock.json file? don't worry 
Run below command to generate package-lock.json file in your folder.

npm i --package-lock-only

Example 2: do i need to add package-lock.json to git

Yes. 
Explanation: To run the application, the dependencies must have been installed 
before. So when you run "npm install", you need to know the version of each 
dependency, which is stored inside package-lock.json.