extern: split type definitions and global constant declarations

src/lib/extern/kwin.d.ts

@@ -1,8 +1,11 @@
-declare const KWin: {
+declare const KWin: KWin;
+declare const Workspace: Workspace;
+
+type KWin = {
     readConfig(key: string, defaultValue: any): any;
 };
 
-declare const Workspace: {
+type Workspace = {
     readonly activities: string[];
     readonly desktops: KwinDesktop[];
     readonly currentDesktop: KwinDesktop;

src/lib/extern/qt.d.ts

@@ -1,13 +1,16 @@
-declare const console: {
+declare const console: Console;
+declare const Qt: Qt;
+
+type Console = {
     log(...args: any[]): void;
     trace(): void;
     assert(boolean, string?): void;
-};
+}
 
-declare const Qt: {
+type Qt = {
     rect(x: number, y: number, width: number, height: number): QmlRect;
     createQmlObject(qml: string, parent: QmlObject): QmlObject;
-};
+}
 
 type QmlObject = unknown;