What is NPM's package-lock.json?

I was minding my own business trying out npm install. It was going so well, then this weird package-lock.json file appeared.

It just kind of turned up uninvited.

Turns out that npm adds this file automagically, to represent the versions of all the packages installed in node_modules.

But what's the point of package-lock.json and how do you use it?

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