Optional custom rewrites

[lionralfs]

Hey 👋

This adds the possibility to pass an array of custom rewrites to the plugin. A use case for this would be the example from the netlify docs on Proxying:

export default function(config) {
    netlifyPlugin(config, {
        redirects: ['/api/* https://api.example.com/:splat 200']
    });
}

becomes

/api/* https://api.example.com/:splat 200
/* /index.html 200

[vinaypuppal]

Hey, this looks like a useful feature.

• I've left a comment below apart from that rest looks good to me.
• Can you add this feature config info to readme as well?

[vinaypuppal]

Here rather then falling back to [] every time I think we should throw an error if the user does not provide redirects as Array. i.e we should check

• if a user provided redirects value
  • if its type is Array then assign it to this.redirects
  • else throw an error asking the user to provide it as Array.
• else assign this.redirects to []

What do you say?

[lionralfs]

Thanks for the suggestions @vinaypuppal
I've updated the PR accordingly

[vinaypuppal]

💯