fix: Tidy up type provision (#764)

* fix(types): Import Svelte types in client instead of top-level types

We import Svelte to hoist its ambient '*.svelte' module type 
declaration. However, this depends on browser/DOM types, which TS 
consumers not implementing for the browser may not have active (e.g. if 
building a storage connector or plugin), so it makes sense to only 
import this in the client itself where consumers will need `"lib": 
["dom"]` in their tsconfig.json or equivalent.

* fix(types): Move '@types/koa' from dev dependency to dependency

Koa types are used directly in `src/types.ts`, so need to be installed 
for TS consumers.

Author: delucis

package-lock.json

@@ -84,7 +84,6 @@
     "@testing-library/svelte": "^1.9.0",
     "@types/enzyme": "^3.10.5",
     "@types/jest": "^24.0.0",
-    "@types/koa": "^2.11.3",
     "@types/koa-router": "^7.4.0",
     "@types/koa__cors": "^3.0.1",
     "@types/react": "^16.9.36",
@@ -148,6 +147,7 @@
   },
   "dependencies": {
     "@koa/cors": "^2.2.1",
+    "@types/koa": "^2.11.3",
     "flatted": "^0.2.3",
     "immer": "^1.8.0",
     "koa": "^2.7.0",

package.json

@@ -6,6 +6,7 @@
  * https://opensource.org/licenses/MIT.
  */
 
+import 'svelte';
 import {
   Dispatch,
   StoreEnhancer,

src/client/client.ts

@@ -1,7 +1,6 @@
 import { Object } from 'ts-toolbelt';
 import Koa from 'koa';
 import { Store as ReduxStore } from 'redux';
-import 'svelte';
 import * as ActionCreators from './core/action-creators';
 import { Flow } from './core/flow';
 import { CreateGameReducer } from './core/reducer';