Provide typescript definitions

[crystalfp]

Typescript support

The module has no accompanying type definition file for typescript in the same package or under @types.

Problem

PS D:\ProjectsShort\ParseMarkdown> tsc
parse.ts:1:28 - error TS7016: Could not find a declaration file for module 'mdast-util-from-markdown'. 
'D:/ProjectsShort/ParseMarkdown/node_modules/mdast-util-from-markdown/index.js' implicitly has an 'any' type.
  Try `npm install @types/mdast-util-from-markdown` if it exists or add a new declaration (.d.ts) file 
containing `declare module 'mdast-util-from-markdown';`

1 import fromMarkdown from "mdast-util-from-markdown";
                           ~~~~~~~~~~~~~~~~~~~~~~~~~~

Expected behavior

Smooth integration in a typescript-based project.

Alternatives

Adding a mdast-util-from-markdown.d.ts file as suggested in the error message makes the compilation succeeds, but losing the type checking.

[ChristianMurphy]

@crystalfp contributions are welcome, in unified/syntax-tree repos typically the JavaScript is left as is and the typings files are added in their own folder.
Unified also builds typings starting at lower level dependencies, and work the typings up,
Micromark will need typings before they'll make their way here.
There is some initial work towards this in micromark/micromark#17, again contributions are welcome!

[wooorm]

Closed by GH-5.