なんかもうめっちゃ変えた

src/web/app/desktop/mixins/user-preview.ts

@@ -52,7 +52,7 @@ function attach(el) {
 			clearTimeout(showTimer);
 			hideTimer = setTimeout(close, 500);
 		});
-		tag = riot.mount(document.body.appendChild(preview), {
+		tag = (riot as any).mount(document.body.appendChild(preview), {
 			user: user
 		})[0];
 	};

src/web/app/desktop/mixins/widget.ts

@@ -3,7 +3,7 @@ import * as riot from 'riot';
 // ミックスインにオプションを渡せないのアレ
 // SEE: https://github.com/riot/riot/issues/2434
 
-riot.mixin('widget', {
+(riot as any).mixin('widget', {
 	init: function() {
 		this.mixin('i');
 		this.mixin('api');