This is a Work In Progress merge request, CAN NOT merge directly now.

Motivation

When I tried to add some test cases for cli.js, I found some test cases will run fail for some reason, for example, npm.config.get('registry') will get a wrong registry(https://registry.yarnpkg.com/) sometimes, I am sure about that the registry(https://registry.yarnpkg.com/) does not exist in any related configuration file.

In addition, use npm lib to write .npmrcfile is unnecessary, fs.writeFileSync is enough. And the programmatic API was removed innpm from v8.0.0, as we can see in index.js, so, the var npm = require('npm') usage is not recommended and already has been deprecated.

I will do

• remove npm dependency
• replace request with node-fetch
• split project files and make the code more concise
• add more test cases