diff --git a/src/client/app/common/scripts/compose-notification.ts b/src/client/app/common/scripts/compose-notification.ts
index 65087cc98e..f65672ee30 100644
--- a/src/client/app/common/scripts/compose-notification.ts
+++ b/src/client/app/common/scripts/compose-notification.ts
@@ -22,7 +22,7 @@ export default function(type, data): Notification {
 
 		case 'unreadMessagingMessage':
 			return {
-				title: '%i18n:common.notification.message-from%'.split("{}")[0] + `${getUserName(data.user)}` + '%i18n:common.notification.message-from%'.split("{}")[1] ,
+				title: '%i18n:common.notification.message-from%'.split('{}')[0] + `${getUserName(data.user)}` + '%i18n:common.notification.message-from%'.split('{}')[1] ,
 				body: data.text, // TODO: getMessagingMessageSummary(data),
 				icon: data.user.avatarUrl
 			};
@@ -30,7 +30,7 @@ export default function(type, data): Notification {
 		case 'reversiInvited':
 			return {
 				title: '%i18n:common.notification.reversi-invited%',
-				body: '%i18n:common.notification.reversi-invited-by%'.split("{}")[0] + `${getUserName(data.parent)}` + '%i18n:common.notification.reversi-invited-by%'.split("{}")[1],
+				body: '%i18n:common.notification.reversi-invited-by%'.split('{}')[0] + `${getUserName(data.parent)}` + '%i18n:common.notification.reversi-invited-by%'.split('{}')[1],
 				icon: data.parent.avatarUrl
 			};
 
@@ -38,21 +38,21 @@ export default function(type, data): Notification {
 			switch (data.type) {
 				case 'mention':
 					return {
-						title: '%i18n:common.notification.notified-by%'.split("{}")[0] + `${getUserName(data.user)}:` + '%i18n:common.notification.notified-by%'.split("{}")[1],
+						title: '%i18n:common.notification.notified-by%'.split('{}')[0] + `${getUserName(data.user)}:` + '%i18n:common.notification.notified-by%'.split('{}')[1],
 						body: getNoteSummary(data),
 						icon: data.user.avatarUrl
 					};
 
 				case 'reply':
 					return {
-						title: '%i18n:common.notification.reply-from%'.split("{}")[0] + `${getUserName(data.user)}` + '%i18n:common.notification.reply-from%'.split("{}")[1],
+						title: '%i18n:common.notification.reply-from%'.split('{}')[0] + `${getUserName(data.user)}` + '%i18n:common.notification.reply-from%'.split('{}')[1],
 						body: getNoteSummary(data),
 						icon: data.user.avatarUrl
 					};
 
 				case 'quote':
 					return {
-						title: '%i18n:common.notification.quoted-by%'.split("{}")[0] + `${getUserName(data.user)}` + '%i18n:common.notification.quoted-by%'.split("{}")[1],
+						title: '%i18n:common.notification.quoted-by%'.split('{}')[0] + `${getUserName(data.user)}` + '%i18n:common.notification.quoted-by%'.split('{}')[1],
 						body: getNoteSummary(data),
 						icon: data.user.avatarUrl
 					};
diff --git a/src/client/app/common/scripts/format-uptime.ts b/src/client/app/common/scripts/format-uptime.ts
index 6a2718f640..6550e4cc39 100644
--- a/src/client/app/common/scripts/format-uptime.ts
+++ b/src/client/app/common/scripts/format-uptime.ts
@@ -15,7 +15,7 @@ export default function(sec) {
 	const t
 		= tod < 60 ? `${Math.floor(tod)} sec`
 		: tod < 3600 ? `${Math.floor(tod / 60)} min`
-		: `${Math.floor(tod / 60 / 60)}:${Math.floor((tod / 60) % 60).toString().padStart(2, "0")}`;
+		: `${Math.floor(tod / 60 / 60)}:${Math.floor((tod / 60) % 60).toString().padStart(2, '0')}`;
 
 	let str = '';
 	if (d) str += `${d}, `;
diff --git a/src/client/app/common/scripts/get-md5.ts b/src/client/app/common/scripts/get-md5.ts
index 51a45b30d5..b78a598118 100644
--- a/src/client/app/common/scripts/get-md5.ts
+++ b/src/client/app/common/scripts/get-md5.ts
@@ -3,8 +3,8 @@
 
 export default (data: ArrayBuffer) => {
 	//const buf = new Buffer(data);
-	//const hash = crypto.createHash("md5");
+	//const hash = crypto.createHash('md5');
 	//hash.update(buf);
-	//return hash.digest("hex");
+	//return hash.digest('hex');
 	return '';
 };
diff --git a/src/client/app/v.d.ts b/src/client/app/v.d.ts
index 8f3a240d80..b3a21c6cdb 100644
--- a/src/client/app/v.d.ts
+++ b/src/client/app/v.d.ts
@@ -1,4 +1,4 @@
-declare module "*.vue" {
+declare module '*.vue' {
 	import Vue from 'vue';
 	export default Vue;
 }
diff --git a/src/games/reversi/core.ts b/src/games/reversi/core.ts
index f678e4ec8b..a198e8dd27 100644
--- a/src/games/reversi/core.ts
+++ b/src/games/reversi/core.ts
@@ -1,4 +1,4 @@
-import { count, concat } from "../../prelude/array";
+import { count, concat } from '../../prelude/array';
 
 // MISSKEY REVERSI ENGINE
 
diff --git a/src/mfm/syntax-highlight.ts b/src/mfm/syntax-highlight.ts
index 3a2b90588b..72913f0ad1 100644
--- a/src/mfm/syntax-highlight.ts
+++ b/src/mfm/syntax-highlight.ts
@@ -1,4 +1,4 @@
-import { capitalize, toUpperCase } from "../prelude/string";
+import { capitalize, toUpperCase } from '../prelude/string';
 
 function escape(text: string) {
 	return text
diff --git a/src/misc/fetch-meta.ts b/src/misc/fetch-meta.ts
index a2eea83c93..229c00620f 100644
--- a/src/misc/fetch-meta.ts
+++ b/src/misc/fetch-meta.ts
@@ -17,7 +17,7 @@ const defaultMeta: any = {
 	enableGithubIntegration: false,
 	enableDiscordIntegration: false,
 	enableExternalUserRecommendation: false,
-	externalUserRecommendationEngine: "https://vinayaka.distsn.org/cgi-bin/vinayaka-user-match-misskey-api.cgi?{{host}}+{{user}}+{{limit}}+{{offset}}",
+	externalUserRecommendationEngine: 'https://vinayaka.distsn.org/cgi-bin/vinayaka-user-match-misskey-api.cgi?{{host}}+{{user}}+{{limit}}+{{offset}}',
 	externalUserRecommendationTimeout: 300000,
 	errorImageUrl: 'https://ai.misskey.xyz/aiart/yubitun.png'
 };
diff --git a/src/prelude/string.ts b/src/prelude/string.ts
index 6149235e47..c2ad8a2e79 100644
--- a/src/prelude/string.ts
+++ b/src/prelude/string.ts
@@ -1,5 +1,5 @@
 export function concat(xs: string[]): string {
-	return xs.reduce((a, b) => a + b, "");
+	return xs.reduce((a, b) => a + b, '');
 }
 
 export function capitalize(s: string): string {
diff --git a/src/remote/activitypub/models/tag.ts b/src/remote/activitypub/models/tag.ts
index 7c9b41eb22..347e001aec 100644
--- a/src/remote/activitypub/models/tag.ts
+++ b/src/remote/activitypub/models/tag.ts
@@ -1,4 +1,4 @@
-import { IIcon } from "./icon";
+import { IIcon } from './icon';
 
 /***
  * tag (ActivityPub)
diff --git a/src/remote/activitypub/renderer/block.ts b/src/remote/activitypub/renderer/block.ts
index 316fc13c05..694f3a1418 100644
--- a/src/remote/activitypub/renderer/block.ts
+++ b/src/remote/activitypub/renderer/block.ts
@@ -1,5 +1,5 @@
 import config from '../../../config';
-import { ILocalUser, IRemoteUser } from "../../../models/user";
+import { ILocalUser, IRemoteUser } from '../../../models/user';
 
 export default (blocker?: ILocalUser, blockee?: IRemoteUser) => ({
 	type: 'Block',
diff --git a/src/remote/activitypub/renderer/delete.ts b/src/remote/activitypub/renderer/delete.ts
index 2a4e70e25e..e090e1c886 100644
--- a/src/remote/activitypub/renderer/delete.ts
+++ b/src/remote/activitypub/renderer/delete.ts
@@ -1,5 +1,5 @@
 import config from '../../../config';
-import { ILocalUser } from "../../../models/user";
+import { ILocalUser } from '../../../models/user';
 
 export default (object: any, user: ILocalUser) => ({
 	type: 'Delete',
diff --git a/src/remote/activitypub/renderer/undo.ts b/src/remote/activitypub/renderer/undo.ts
index bf90a3f281..dbcf5732be 100644
--- a/src/remote/activitypub/renderer/undo.ts
+++ b/src/remote/activitypub/renderer/undo.ts
@@ -1,5 +1,5 @@
 import config from '../../../config';
-import { ILocalUser, IUser } from "../../../models/user";
+import { ILocalUser, IUser } from '../../../models/user';
 
 export default (object: any, user: ILocalUser | IUser) => ({
 	type: 'Undo',
diff --git a/src/tools/add-emoji.ts b/src/tools/add-emoji.ts
index 875af55c14..e40c96b79d 100644
--- a/src/tools/add-emoji.ts
+++ b/src/tools/add-emoji.ts
@@ -1,5 +1,5 @@
 import * as debug from 'debug';
-import Emoji from "../models/emoji";
+import Emoji from '../models/emoji';
 
 debug.enable('*');
 
diff --git a/src/tools/resync-remote-user.ts b/src/tools/resync-remote-user.ts
index 3a63512f45..c013de723f 100644
--- a/src/tools/resync-remote-user.ts
+++ b/src/tools/resync-remote-user.ts
@@ -1,4 +1,4 @@
-import parseAcct from "../misc/acct/parse";
+import parseAcct from '../misc/acct/parse';
 import resolveUser from '../remote/resolve-user';
 import * as debug from 'debug';