diff --git a/package.json b/package.json
index 0336725bda..6a9e7e26f0 100644
--- a/package.json
+++ b/package.json
@@ -64,14 +64,15 @@
     "@types/webpack": "3.0.13",
     "@types/webpack-stream": "3.2.7",
     "@types/websocket": "0.0.34",
+    "awesome-typescript-loader": "^3.2.3",
     "chai": "4.1.2",
     "chai-http": "3.0.0",
     "css-loader": "0.28.7",
     "event-stream": "3.3.4",
     "gulp": "3.9.1",
     "gulp-cssnano": "2.1.2",
-    "gulp-imagemin": "3.4.0",
     "gulp-htmlmin": "3.0.0",
+    "gulp-imagemin": "3.4.0",
     "gulp-mocha": "4.3.1",
     "gulp-pug": "3.3.0",
     "gulp-rename": "1.2.2",
diff --git a/src/api/bot/core.ts b/src/api/bot/core.ts
index cf2bdef1dc..57330e67eb 100644
--- a/src/api/bot/core.ts
+++ b/src/api/bot/core.ts
@@ -3,7 +3,7 @@ import * as bcrypt from 'bcryptjs';
 
 import User, { IUser } from '../models/user';
 
-import getPostSummary from '../../common/get-post-summary.js';
+import getPostSummary from '../../common/get-post-summary';
 
 export default class BotCore extends EventEmitter {
 	public user: IUser = null;
@@ -109,7 +109,9 @@ export default class BotCore extends EventEmitter {
 	public async getTl() {
 		if (this.user == null) return 'まずサインインしてください。';
 
-		const tl = await require('../endpoints/posts/timeline')({}, this.user);
+		const tl = await require('../endpoints/posts/timeline')({
+			limit: 5
+		}, this.user);
 
 		const text = tl
 			.map(post => getPostSummary(post))
diff --git a/src/common/get-post-summary.js b/src/common/get-post-summary.ts
similarity index 94%
rename from src/common/get-post-summary.js
rename to src/common/get-post-summary.ts
index f7a481a164..f628a32b41 100644
--- a/src/common/get-post-summary.js
+++ b/src/common/get-post-summary.ts
@@ -2,7 +2,7 @@
  * 投稿を表す文字列を取得します。
  * @param {*} post 投稿
  */
-const summarize = post => {
+const summarize = (post: any): string => {
 	let summary = post.text ? post.text : '';
 
 	// メディアが添付されているとき
diff --git a/src/web/app/desktop/script.js b/src/web/app/desktop/script.js
index e3dc8b7d96..46a7fce700 100644
--- a/src/web/app/desktop/script.js
+++ b/src/web/app/desktop/script.js
@@ -11,7 +11,7 @@ import * as riot from 'riot';
 import init from '../init';
 import route from './router';
 import fuckAdBlock from './scripts/fuck-ad-block';
-import getPostSummary from '../../../common/get-post-summary';
+import getPostSummary from '../../../common/get-post-summary.ts';
 
 /**
  * init
diff --git a/src/web/app/desktop/tags/notifications.tag b/src/web/app/desktop/tags/notifications.tag
index 4747d1c0f4..1046358ce9 100644
--- a/src/web/app/desktop/tags/notifications.tag
+++ b/src/web/app/desktop/tags/notifications.tag
@@ -207,7 +207,7 @@
 
 	</style>
 	<script>
-		import getPostSummary from '../../../../common/get-post-summary';
+		import getPostSummary from '../../../../common/get-post-summary.ts';
 		this.getPostSummary = getPostSummary;
 
 		this.mixin('i');
diff --git a/src/web/app/desktop/tags/pages/home.tag b/src/web/app/desktop/tags/pages/home.tag
index a56c546059..e8ba4023de 100644
--- a/src/web/app/desktop/tags/pages/home.tag
+++ b/src/web/app/desktop/tags/pages/home.tag
@@ -8,7 +8,7 @@
 	</style>
 	<script>
 		import Progress from '../../../common/scripts/loading';
-		import getPostSummary from '../../../../../common/get-post-summary';
+		import getPostSummary from '../../../../../common/get-post-summary.ts';
 
 		this.mixin('i');
 		this.mixin('api');
diff --git a/src/web/app/mobile/tags/notification-preview.tag b/src/web/app/mobile/tags/notification-preview.tag
index 36b4f5eda7..1fdcc57641 100644
--- a/src/web/app/mobile/tags/notification-preview.tag
+++ b/src/web/app/mobile/tags/notification-preview.tag
@@ -110,7 +110,7 @@
 
 	</style>
 	<script>
-		import getPostSummary from '../../../../common/get-post-summary';
+		import getPostSummary from '../../../../common/get-post-summary.ts';
 		this.getPostSummary = getPostSummary;
 		this.notification = this.opts.notification;
 	</script>
diff --git a/src/web/app/mobile/tags/notification.tag b/src/web/app/mobile/tags/notification.tag
index 416493ee23..53222b9dbe 100644
--- a/src/web/app/mobile/tags/notification.tag
+++ b/src/web/app/mobile/tags/notification.tag
@@ -163,7 +163,7 @@
 
 	</style>
 	<script>
-		import getPostSummary from '../../../../common/get-post-summary';
+		import getPostSummary from '../../../../common/get-post-summary.ts';
 		this.getPostSummary = getPostSummary;
 		this.notification = this.opts.notification;
 	</script>
diff --git a/src/web/app/mobile/tags/notifications.tag b/src/web/app/mobile/tags/notifications.tag
index 9985b3351c..7370aa84d3 100644
--- a/src/web/app/mobile/tags/notifications.tag
+++ b/src/web/app/mobile/tags/notifications.tag
@@ -78,7 +78,7 @@
 
 	</style>
 	<script>
-		import getPostSummary from '../../../../common/get-post-summary';
+		import getPostSummary from '../../../../common/get-post-summary.ts';
 		this.getPostSummary = getPostSummary;
 
 		this.mixin('api');
diff --git a/src/web/app/mobile/tags/page/home.tag b/src/web/app/mobile/tags/page/home.tag
index 6f7369798e..3b0255b293 100644
--- a/src/web/app/mobile/tags/page/home.tag
+++ b/src/web/app/mobile/tags/page/home.tag
@@ -9,7 +9,7 @@
 	<script>
 		import ui from '../../scripts/ui-event';
 		import Progress from '../../../common/scripts/loading';
-		import getPostSummary from '../../../../../common/get-post-summary';
+		import getPostSummary from '../../../../../common/get-post-summary.ts';
 		import openPostForm from '../../scripts/open-post-form';
 
 		this.mixin('i');
diff --git a/src/web/app/mobile/tags/post-detail.tag b/src/web/app/mobile/tags/post-detail.tag
index 4be1a8080a..ed275749ec 100644
--- a/src/web/app/mobile/tags/post-detail.tag
+++ b/src/web/app/mobile/tags/post-detail.tag
@@ -264,7 +264,7 @@
 	</style>
 	<script>
 		import compile from '../../common/scripts/text-compiler';
-		import getPostSummary from '../../../../common/get-post-summary';
+		import getPostSummary from '../../../../common/get-post-summary.ts';
 		import openPostForm from '../scripts/open-post-form';
 
 		this.mixin('api');
diff --git a/src/web/app/mobile/tags/timeline.tag b/src/web/app/mobile/tags/timeline.tag
index 80debbf66e..5ecc2df9d1 100644
--- a/src/web/app/mobile/tags/timeline.tag
+++ b/src/web/app/mobile/tags/timeline.tag
@@ -464,7 +464,7 @@
 	</style>
 	<script>
 		import compile from '../../common/scripts/text-compiler';
-		import getPostSummary from '../../../../common/get-post-summary';
+		import getPostSummary from '../../../../common/get-post-summary.ts';
 		import openPostForm from '../scripts/open-post-form';
 
 		this.mixin('api');
diff --git a/src/web/app/mobile/tags/user.tag b/src/web/app/mobile/tags/user.tag
index cc34074218..a332e930e2 100644
--- a/src/web/app/mobile/tags/user.tag
+++ b/src/web/app/mobile/tags/user.tag
@@ -428,7 +428,7 @@
 
 	</style>
 	<script>
-		import summary from '../../../../common/get-post-summary';
+		import summary from '../../../../common/get-post-summary.ts';
 
 		this.post = this.opts.post;
 		this.text = summary(this.post);
diff --git a/webpack/module/rules/index.ts b/webpack/module/rules/index.ts
index 2308f4e535..2707a9c2f1 100644
--- a/webpack/module/rules/index.ts
+++ b/webpack/module/rules/index.ts
@@ -2,10 +2,12 @@ import i18n from './i18n';
 import themeColor from './theme-color';
 import tag from './tag';
 import stylus from './stylus';
+import typescript from './typescript';
 
 export default (lang, locale) => [
 	i18n(lang, locale),
 	themeColor(),
 	tag(),
-	stylus()
+	stylus(),
+	typescript()
 ];
diff --git a/webpack/module/rules/typescript.ts b/webpack/module/rules/typescript.ts
new file mode 100644
index 0000000000..eb2b279a55
--- /dev/null
+++ b/webpack/module/rules/typescript.ts
@@ -0,0 +1,8 @@
+/**
+ * TypeScript
+ */
+
+export default () => ({
+	test: /\.ts$/,
+	use: 'awesome-typescript-loader'
+});