Remove devtools module declaraction

[andrewiggins]

I haven't found a way to avoid getting the following error from the preact/devtools declaration in this file:

error TS2665: Invalid module name in augmentation. Module 'preact/devtools' resolves to an untyped module at 'node_modules/preact/devtools.js', which cannot be augmented.

I don't believe this declaration is really necessary though. Neither devtools.js nor debug.js have any exports so using syntax such as import * as something from 'preact/debug'; wouldn't be correct usage. TypeScript only needs the module to be declared if you try to import something from it. Since the correct usage of these modules is import 'preact/debug'; or require('preact/debug');, we don't need to declare definitions for these modules. TypeScript handles import 'preact/debug'; and require('preact/debug'); fine without any definitions.

P.S. it appears that error is because it isn't declared within a global scope (see microsoft/TypeScript#9748). However wrapping this declaration in a declare global leads to others errors. Instead of chasing that rabbit hole, I thought it made more sense to just remove it, given the rationale above.

Thoughts?

[coveralls]

Coverage remained the same at 100.0% when pulling 53d3cb6 on andrewiggins:remove-devtools-decl-type into 8a54f80 on developit:master.

[valotas]

Can you also add a test for it? I believe something like

import 'preact/debug';

on top of https://github.com/developit/preact/blob/master/test/ts/preact.tsx should prove that, right?

[marvinhagemeister]

Good catch! Verified locally with TS 2.8

[andrewiggins]

@valotas Yea, good call. I'll catch it in my next PR. Call me out if I forget :)

[marvinhagemeister]

@andrewiggins no worries, a test for import 'preact/debug' would've been green either way, with or without the changes in this PR.

[andrewiggins]

Oh, that's true