整理した

src/client/app/mobile/api/post.ts

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+import PostForm from '../views/components/post-form.vue';
+//import RepostForm from '../views/components/repost-form.vue';
+import getPostSummary from '../../../../common/get-post-summary';
+
+export default (os) => (opts) => {
+	const o = opts || {};
+
+	if (o.repost) {
+		/*const vm = new RepostForm({
+			propsData: {
+				repost: o.repost
+			}
+		}).$mount();
+		vm.$once('cancel', recover);
+		vm.$once('post', recover);
+		document.body.appendChild(vm.$el);*/
+
+		const text = window.prompt(`「${getPostSummary(o.repost)}」をRepost`);
+		if (text == null) return;
+		os.api('posts/create', {
+			repostId: o.repost.id,
+			text: text == '' ? undefined : text
+		});
+	} else {
+		const app = document.getElementById('app');
+		app.style.display = 'none';
+
+		function recover() {
+			app.style.display = 'block';
+		}
+
+		const vm = new PostForm({
+			parent: os.app,
+			propsData: {
+				reply: o.reply
+			}
+		}).$mount();
+		vm.$once('cancel', recover);
+		vm.$once('post', recover);
+		document.body.appendChild(vm.$el);
+		(vm as any).focus();
+	}
+};