Cannot specify option for the plugin's installation of the project's modules

[HyperBrain]

I have a problem, that some of my project dependencies reference optional dependencies, that I have to disable when doing an npm install by specifying the --no-optional switch (e.g. fsevents on Windows).

The npm install --no-optional works in the SLS project directory, but when doing a serverless webpack, the plugin seems to do a completely separate install of the modules and hangs, because the --no-optional switch was not given to the npm command.

I see two possible solution for that: Either provide some means to add npm options on the command line/config or copy the node modules from the node_modules folder instead of doing it completely separate.

[HyperBrain]

I created an improvement issue at npm-programmatic for support of arbitrary options on their end. As soon as this has been implemented, the webpack plugin could make use of it and provide the requested feature.
Manak/npm-programmatic#9

[HyperBrain]

With npm 5 and the completely reworked packaging in the plugin, this is not really needed anymore.