Renew API style

[Rokt33r]

Overloading

Lots of APIs are using overloading. (ex: Unified#use and Unified#data) I think overloading is quite harmful. To use this, we need to implement lots of assertion code and those assertions seem to be quite fragile.

I'm going to split those APIs

2 types of Parser and Compiler

A function or a class can be Parser or Compiler. To make this possible, we have to use another fragile assertion, checking the parser or the compiler is a function or not.

I think it should be better to use a class for all times.

data property in Unified

I think data is quite useless. To share the options, we can provide them to each plugin.

[Rokt33r]

ParserInstance Interface

The first argument, doc, isn't used at all and it looks redundant.

https://github.com/wooorm/remark/blob/master/packages/remark-parse/lib/parser.js#L12

[Rokt33r]

Confusing var name(Position and Point)

Although there are definitions, some libraries are using different name, like Location for Position and Position for Point.

Suggestion:

• A specific point : Position
• A range with 2 points : Range

[Rokt33r]

Node with Props

To create a typing for a Node with props, using type NodeWithProps<P> = Node & P is considered fragile.
Just like React component, it should be better to provide a dedicated property, props, to use custom fields.