Add typescript typings for preact

[aaronjensen]

What:

These are working typescript types for Preact. What doesn't work is the build.
To make it work, the preact/package.json would need to have an entry for
typings and the typings would need to be copied to the preact folder. Since
all of this seems it would need to happen in kcd-scripts maybe @kentcdodds has
some time to help with that?

{
  "main": "dist/glamorous.cjs.js",
  "jsnext:main": "dist/glamorous.esm.js",
  "module": "dist/glamorous.esm.js",
  "typings": "typings/glamorous.d.ts"
}

Why:

There are currently no typescript types for preact

How:

I upgraded a medium sized preact-glamorous project.

Checklist:

• Documentation N/A
• Tests
• Ready to be merged
• Added myself to contributors table

[Ailrun]

Thank you for your pull request!
The changes what you made in this PR are

1. Copy-and-paste original types
2. Change react to preact
3. Change react only types(React.Component...) to preact types(preact.Component...)
4. Add IntrinsicAttributes and IntrinsicClassAttributes in the place of JSX.{something}.

Am I right? Are there anything important I missed?
If what I listed are all, it looks like the only thing this PR missed is adding some tests... of course, after fixing typing-loading issues.

[kentcdodds]

What doesn't work is the build.

I don't think I want to bake that into kcd-scripts just yet. So let's add a postbuild step that calls into a node script to modify the generated preact/package.json. Should be just three or four lines.

[codecov-io]

Codecov Report

Merging #416 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #416   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     10           
  Lines         177    177           
  Branches       50     50           
=====================================
  Hits          177    177

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[aaronjensen]

Am I right? Are there anything important I missed?

Yeah I think that's pretty much it.

If what I listed are all, it looks like the only thing this PR missed is adding some tests... of course, after fixing typing-loading issues.

Added tests and fixed build as @kentcdodds suggested.

Let me know if there's anything else I should do. Thanks!

[Ailrun]

Sorry for delay. This looks OK for me.