diff --git a/src/chart/index.ts b/src/chart/index.ts
index fa9f4c2eb..ccfcef39a 100644
--- a/src/chart/index.ts
+++ b/src/chart/index.ts
@@ -74,14 +74,14 @@ export default abstract class Chart<T> {
 		const query: Obj = {};
 
 		const dive = (x: Obj, path: string) => {
-			Object.entries(x).forEach(([k, v]) => {
+			for (const [k, v] of Object.entries(x)) {
 				const p = path ? `${path}.${k}` : k;
 				if (typeof v === 'number') {
 					query[p] = v;
 				} else {
 					dive(v, p);
 				}
-			});
+			}
 		};
 
 		dive(x, path);
@@ -334,14 +334,14 @@ export default abstract class Chart<T> {
 		 * にする
 		 */
 		const dive = (x: Obj, path?: string) => {
-			Object.entries(x).forEach(([k, v]) => {
+			for (const [k, v] of Object.entries(x)) {
 				const p = path ? `${path}.${k}` : k;
 				if (typeof v == 'object') {
 					dive(v, p);
 				} else {
 					nestedProperty.set(res, p, chart.map(s => nestedProperty.get(s, p)));
 				}
-			});
+			}
 		};
 
 		dive(chart[0]);
diff --git a/src/client/app/admin/views/ap-log.vue b/src/client/app/admin/views/ap-log.vue
index 1524340ec..be665656a 100644
--- a/src/client/app/admin/views/ap-log.vue
+++ b/src/client/app/admin/views/ap-log.vue
@@ -56,7 +56,9 @@ export default Vue.extend({
 		},
 
 		onLogs(logs) {
-			logs.reverse().forEach(log => this.onLog(log));
+			for (const log of logs.reverse()) {
+				this.onLog(log)
+			}
 		}
 	}
 });
diff --git a/src/client/app/admin/views/cpu-memory.vue b/src/client/app/admin/views/cpu-memory.vue
index a111dfe32..a8237fe41 100644
--- a/src/client/app/admin/views/cpu-memory.vue
+++ b/src/client/app/admin/views/cpu-memory.vue
@@ -132,7 +132,9 @@ export default Vue.extend({
 		},
 
 		onStatsLog(statsLog) {
-			statsLog.reverse().forEach(stats => this.onStats(stats));
+			for (const stats of statsLog.reverse()) {
+				this.onStats(stats);
+			}
 		}
 	}
 });
diff --git a/src/client/app/admin/views/dashboard.vue b/src/client/app/admin/views/dashboard.vue
index 3fd024a13..9fb97f2ef 100644
--- a/src/client/app/admin/views/dashboard.vue
+++ b/src/client/app/admin/views/dashboard.vue
@@ -127,12 +127,12 @@ export default Vue.extend({
 		this.$root.api('instances', {
 			sort: '+notes'
 		}).then(instances => {
-			instances.forEach(i => {
+			for (const i of instances) {
 				i.bg = randomColor({
 					seed: i.host,
 					luminosity: 'dark'
 				});
-			});
+			}
 			this.instances = instances;
 		});
 	},
diff --git a/src/client/app/admin/views/emoji.vue b/src/client/app/admin/views/emoji.vue
index 0819a0754..cf0f64320 100644
--- a/src/client/app/admin/views/emoji.vue
+++ b/src/client/app/admin/views/emoji.vue
@@ -91,7 +91,9 @@ export default Vue.extend({
 		fetchEmojis() {
 			this.$root.api('admin/emoji/list').then(emojis => {
 				emojis.reverse();
-				emojis.forEach(e => e.aliases = (e.aliases || []).join(' '));
+				for (const e of emojis) {
+					e.aliases = (e.aliases || []).join(' ');
+				}
 				this.emojis = emojis;
 			});
 		},
diff --git a/src/client/app/boot.js b/src/client/app/boot.js
index 5e894a18d..4e9d3192c 100644
--- a/src/client/app/boot.js
+++ b/src/client/app/boot.js
@@ -17,9 +17,9 @@
 	//#region Apply theme
 	const theme = localStorage.getItem('theme');
 	if (theme) {
-		Object.entries(JSON.parse(theme)).forEach(([k, v]) => {
+		for (const [k, v] of Object.entries(JSON.parse(theme))) {
 			document.documentElement.style.setProperty(`--${k}`, v.toString());
-		});
+		}
 	}
 	//#endregion
 
@@ -160,7 +160,7 @@
 			navigator.serviceWorker.controller.postMessage('clear');
 
 			navigator.serviceWorker.getRegistrations().then(registrations => {
-				registrations.forEach(registration => registration.unregister());
+				for (const registration of registrations) registration.unregister();
 			});
 		} catch (e) {
 			console.error(e);
diff --git a/src/client/app/common/define-widget.ts b/src/client/app/common/define-widget.ts
index 56314a410..5eb971844 100644
--- a/src/client/app/common/define-widget.ts
+++ b/src/client/app/common/define-widget.ts
@@ -1,6 +1,6 @@
 import Vue from 'vue';
 
-export default function<T extends object>(data: {
+export default function <T extends object>(data: {
 	name: string;
 	props?: () => T;
 }) {
@@ -53,11 +53,10 @@ export default function<T extends object>(data: {
 			mergeProps() {
 				if (data.props) {
 					const defaultProps = data.props();
-					Object.keys(defaultProps).forEach(prop => {
-						if (!this.props.hasOwnProperty(prop)) {
-							Vue.set(this.props, prop, defaultProps[prop]);
-						}
-					});
+					for (const prop of Object.keys(defaultProps)) {
+						if (this.props.hasOwnProperty(prop)) continue;
+						Vue.set(this.props, prop, defaultProps[prop]);
+					}
 				}
 			},
 
diff --git a/src/client/app/common/hotkey.ts b/src/client/app/common/hotkey.ts
index 28a5ec204..b2afd57ae 100644
--- a/src/client/app/common/hotkey.ts
+++ b/src/client/app/common/hotkey.ts
@@ -28,15 +28,15 @@ const getKeyMap = keymap => Object.entries(keymap).map(([patterns, callback]): a
 			shift: false
 		} as pattern;
 
-		part.trim().split('+').forEach(key => {
-			key = key.trim().toLowerCase();
+		const keys = part.trim().split('+').map(x => x.trim().toLowerCase());
+		for (const key of keys) {
 			switch (key) {
 				case 'ctrl': pattern.ctrl = true; break;
 				case 'alt': pattern.alt = true; break;
 				case 'shift': pattern.shift = true; break;
 				default: pattern.which = keyCode(key).map(k => k.toLowerCase());
 			}
-		});
+		}
 
 		return pattern;
 	});
diff --git a/src/client/app/common/scripts/check-for-update.ts b/src/client/app/common/scripts/check-for-update.ts
index e8a5d18f0..20da83a0c 100644
--- a/src/client/app/common/scripts/check-for-update.ts
+++ b/src/client/app/common/scripts/check-for-update.ts
@@ -14,9 +14,10 @@ export default async function($root: any, force = false, silent = false) {
 				navigator.serviceWorker.controller.postMessage('clear');
 			}
 
-			navigator.serviceWorker.getRegistrations().then(registrations => {
-				registrations.forEach(registration => registration.unregister());
-			});
+			const registrations = await navigator.serviceWorker.getRegistrations();
+			for (const registration of registrations) {
+				registration.unregister();
+			}
 		} catch (e) {
 			console.error(e);
 		}
diff --git a/src/client/app/common/scripts/stream.ts b/src/client/app/common/scripts/stream.ts
index 80278a76f..23f839ae8 100644
--- a/src/client/app/common/scripts/stream.ts
+++ b/src/client/app/common/scripts/stream.ts
@@ -111,9 +111,9 @@ export default class Stream extends EventEmitter {
 				connections = [this.nonSharedConnections.find(c => c.id === id)];
 			}
 
-			connections.filter(c => c != null).forEach(c => {
+			for (const c of connections.filter(c => c != null)) {
 				c.emit(body.type, body.body);
-			});
+			}
 		} else {
 			this.emit(type, body);
 		}
diff --git a/src/client/app/common/views/components/autocomplete.vue b/src/client/app/common/views/components/autocomplete.vue
index 1d860ff54..e33e4ae8c 100644
--- a/src/client/app/common/views/components/autocomplete.vue
+++ b/src/client/app/common/views/components/autocomplete.vue
@@ -57,18 +57,18 @@ const emjdb: EmojiDef[] = lib.map((x: any) => ({
 	url: `https://twemoji.maxcdn.com/2/svg/${char2file(x[1].char)}.svg`
 }));
 
-lib.forEach((x: any) => {
+for (const x of lib as any) {
 	if (x[1].keywords) {
-		x[1].keywords.forEach(k => {
+		for (const k of x[1].keywords) {
 			emjdb.push({
 				emoji: x[1].char,
 				name: k,
 				aliasOf: x[0],
 				url: `https://twemoji.maxcdn.com/2/svg/${char2file(x[1].char)}.svg`
 			});
-		});
+		}
 	}
-});
+}
 
 emjdb.sort((a, b) => a.name.length - b.name.length);
 
@@ -120,7 +120,7 @@ export default Vue.extend({
 		const customEmojis = (this.$root.getMetaSync() || { emojis: [] }).emojis || [];
 		const emojiDefinitions: EmojiDef[] = [];
 
-		customEmojis.forEach(x => {
+		for (const x of customEmojis) {
 			emojiDefinitions.push({
 				name: x.name,
 				emoji: `:${x.name}:`,
@@ -129,7 +129,7 @@ export default Vue.extend({
 			});
 
 			if (x.aliases) {
-				x.aliases.forEach(alias => {
+				for (const alias of x.aliases) {
 					emojiDefinitions.push({
 						name: alias,
 						aliasOf: x.name,
@@ -137,9 +137,9 @@ export default Vue.extend({
 						url: x.url,
 						isCustomEmoji: true
 					});
-				});
+				}
 			}
-		});
+		}
 
 		emojiDefinitions.sort((a, b) => a.name.length - b.name.length);
 
@@ -148,9 +148,9 @@ export default Vue.extend({
 
 		this.textarea.addEventListener('keydown', this.onKeydown);
 
-		Array.from(document.querySelectorAll('body *')).forEach(el => {
+		for (const el of Array.from(document.querySelectorAll('body *'))) {
 			el.addEventListener('mousedown', this.onMousedown);
-		});
+		}
 
 		this.$nextTick(() => {
 			this.exec();
@@ -166,18 +166,18 @@ export default Vue.extend({
 	beforeDestroy() {
 		this.textarea.removeEventListener('keydown', this.onKeydown);
 
-		Array.from(document.querySelectorAll('body *')).forEach(el => {
+		for (const el of Array.from(document.querySelectorAll('body *'))) {
 			el.removeEventListener('mousedown', this.onMousedown);
-		});
+		}
 	},
 
 	methods: {
 		exec() {
 			this.select = -1;
 			if (this.$refs.suggests) {
-				Array.from(this.items).forEach(el => {
+				for (const el of Array.from(this.items)) {
 					el.removeAttribute('data-selected');
-				});
+				}
 			}
 
 			if (this.type == 'user') {
@@ -316,9 +316,9 @@ export default Vue.extend({
 		},
 
 		applySelect() {
-			Array.from(this.items).forEach(el => {
+			for (const el of Array.from(this.items)) {
 				el.removeAttribute('data-selected');
-			});
+			}
 
 			this.items[this.select].setAttribute('data-selected', 'true');
 			(this.items[this.select] as any).focus();
diff --git a/src/client/app/common/views/components/emoji-picker.vue b/src/client/app/common/views/components/emoji-picker.vue
index 818104716..f9164ad52 100644
--- a/src/client/app/common/views/components/emoji-picker.vue
+++ b/src/client/app/common/views/components/emoji-picker.vue
@@ -114,11 +114,11 @@ export default Vue.extend({
 		},
 
 		onScroll(e) {
-			const section = this.categories.forEach(x => {
+			for (const x of this.categories) {
 				const top = e.target.scrollTop;
 				const el = this.$refs[x.ref][0];
 				x.isActive = el.offsetTop <= top && el.offsetTop + el.offsetHeight > top;
-			});
+			}
 		},
 
 		chosen(emoji) {
diff --git a/src/client/app/common/views/components/games/reversi/reversi.game.vue b/src/client/app/common/views/components/games/reversi/reversi.game.vue
index c5619f905..6d13b34c3 100644
--- a/src/client/app/common/views/components/games/reversi/reversi.game.vue
+++ b/src/client/app/common/views/components/games/reversi/reversi.game.vue
@@ -185,9 +185,9 @@ export default Vue.extend({
 			loopedBoard: this.game.settings.loopedBoard
 		});
 
-		this.game.logs.forEach(log => {
+		for (const log of this.game.logs) {
 			this.o.put(log.color, log.pos);
-		});
+		}
 
 		this.logs = this.game.logs;
 		this.logPos = this.logs.length;
@@ -287,9 +287,9 @@ export default Vue.extend({
 				loopedBoard: this.game.settings.loopedBoard
 			});
 
-			this.game.logs.forEach(log => {
+			for (const log of this.game.logs) {
 				this.o.put(log.color, log.pos, true);
-			});
+			}
 
 			this.logs = this.game.logs;
 			this.logPos = this.logs.length;
diff --git a/src/client/app/common/views/components/messaging-room.vue b/src/client/app/common/views/components/messaging-room.vue
index b6132ceeb..29aacd3ba 100644
--- a/src/client/app/common/views/components/messaging-room.vue
+++ b/src/client/app/common/views/components/messaging-room.vue
@@ -196,12 +196,12 @@ export default Vue.extend({
 
 		onRead(ids) {
 			if (!Array.isArray(ids)) ids = [ids];
-			ids.forEach(id => {
+			for (const id of ids) {
 				if (this.messages.some(x => x.id == id)) {
 					const exist = this.messages.map(x => x.id).indexOf(id);
 					this.messages[exist].isRead = true;
 				}
-			});
+			}
 		},
 
 		isBottom() {
@@ -248,13 +248,13 @@ export default Vue.extend({
 
 		onVisibilitychange() {
 			if (document.hidden) return;
-			this.messages.forEach(message => {
+			for (const message of this.messages) {
 				if (message.userId !== this.$store.state.i.id && !message.isRead) {
 					this.connection.send('read', {
 						id: message.id
 					});
 				}
-			});
+			}
 		}
 	}
 });
diff --git a/src/client/app/common/views/components/messaging.vue b/src/client/app/common/views/components/messaging.vue
index f8d0623b9..9683ca0ca 100644
--- a/src/client/app/common/views/components/messaging.vue
+++ b/src/client/app/common/views/components/messaging.vue
@@ -103,10 +103,10 @@ export default Vue.extend({
 			this.messages.unshift(message);
 		},
 		onRead(ids) {
-			ids.forEach(id => {
+			for (const id of ids) {
 				const found = this.messages.find(m => m.id == id);
 				if (found) found.isRead = true;
-			});
+			}
 		},
 		search() {
 			if (this.q == '') {
diff --git a/src/client/app/common/views/components/poll.vue b/src/client/app/common/views/components/poll.vue
index 8a31ec83d..8817d88cc 100644
--- a/src/client/app/common/views/components/poll.vue
+++ b/src/client/app/common/views/components/poll.vue
@@ -55,12 +55,12 @@ export default Vue.extend({
 				noteId: this.note.id,
 				choice: id
 			}).then(() => {
-				this.poll.choices.forEach(c => {
+				for (const c of this.poll.choices) {
 					if (c.id == id) {
 						c.votes++;
 						Vue.set(c, 'isVoted', true);
 					}
-				});
+				}
 				this.showResult = true;
 			});
 		}
diff --git a/src/client/app/common/views/widgets/posts-monitor.vue b/src/client/app/common/views/widgets/posts-monitor.vue
index 9b2cc5a6c..1af306b88 100644
--- a/src/client/app/common/views/widgets/posts-monitor.vue
+++ b/src/client/app/common/views/widgets/posts-monitor.vue
@@ -164,7 +164,7 @@ export default define({
 			this.draw();
 		},
 		onStatsLog(statsLog) {
-			statsLog.forEach(stats => this.onStats(stats));
+			for (const stats of statsLog) this.onStats(stats);
 		}
 	}
 });
diff --git a/src/client/app/common/views/widgets/server.cpu-memory.vue b/src/client/app/common/views/widgets/server.cpu-memory.vue
index 4a0341ddc..92e5479b1 100644
--- a/src/client/app/common/views/widgets/server.cpu-memory.vue
+++ b/src/client/app/common/views/widgets/server.cpu-memory.vue
@@ -121,7 +121,7 @@ export default Vue.extend({
 			this.memP = (stats.mem.used / stats.mem.total * 100).toFixed(0);
 		},
 		onStatsLog(statsLog) {
-			statsLog.reverse().forEach(stats => this.onStats(stats));
+			for (const stats of statsLog.reverse()) this.onStats(stats);
 		}
 	}
 });
diff --git a/src/client/app/desktop/views/components/activity.calendar.vue b/src/client/app/desktop/views/components/activity.calendar.vue
index 4306aa928..9e3e6f081 100644
--- a/src/client/app/desktop/views/components/activity.calendar.vue
+++ b/src/client/app/desktop/views/components/activity.calendar.vue
@@ -29,7 +29,9 @@ import Vue from 'vue';
 export default Vue.extend({
 	props: ['data'],
 	created() {
-		this.data.forEach(d => d.total = d.notes + d.replies + d.renotes);
+		for (const d of this.data) {
+			d.total = d.notes + d.replies + d.renotes;
+		}
 		const peak = Math.max.apply(null, this.data.map(d => d.total));
 
 		const now = new Date();
diff --git a/src/client/app/desktop/views/components/activity.chart.vue b/src/client/app/desktop/views/components/activity.chart.vue
index a6122ce8e..7a5004e99 100644
--- a/src/client/app/desktop/views/components/activity.chart.vue
+++ b/src/client/app/desktop/views/components/activity.chart.vue
@@ -57,7 +57,10 @@ export default Vue.extend({
 		};
 	},
 	created() {
-		this.data.forEach(d => d.total = d.notes + d.replies + d.renotes);
+		for (const d of this.data) {
+			d.total = d.notes + d.replies + d.renotes;
+		}
+
 		this.render();
 	},
 	methods: {
diff --git a/src/client/app/desktop/views/components/context-menu.vue b/src/client/app/desktop/views/components/context-menu.vue
index b0a34866c..c92ce3a47 100644
--- a/src/client/app/desktop/views/components/context-menu.vue
+++ b/src/client/app/desktop/views/components/context-menu.vue
@@ -34,9 +34,9 @@ export default Vue.extend({
 			this.$el.style.left = x + 'px';
 			this.$el.style.top = y + 'px';
 
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.addEventListener('mousedown', this.onMousedown);
-			});
+			}
 
 			this.$el.style.display = 'block';
 
@@ -59,9 +59,9 @@ export default Vue.extend({
 			this.close();
 		},
 		close() {
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.removeEventListener('mousedown', this.onMousedown);
-			});
+			}
 
 			this.$emit('closed');
 			this.destroyDom();
diff --git a/src/client/app/desktop/views/components/drive.folder.vue b/src/client/app/desktop/views/components/drive.folder.vue
index 20d962015..02f219a98 100644
--- a/src/client/app/desktop/views/components/drive.folder.vue
+++ b/src/client/app/desktop/views/components/drive.folder.vue
@@ -120,9 +120,9 @@ export default Vue.extend({
 
 			// ファイルだったら
 			if (e.dataTransfer.files.length > 0) {
-				Array.from(e.dataTransfer.files).forEach(file => {
+				for (const file of Array.from(e.dataTransfer.files)) {
 					this.browser.upload(file, this.folder);
-				});
+				}
 				return;
 			}
 
diff --git a/src/client/app/desktop/views/components/drive.nav-folder.vue b/src/client/app/desktop/views/components/drive.nav-folder.vue
index 813c44ab4..14ab46764 100644
--- a/src/client/app/desktop/views/components/drive.nav-folder.vue
+++ b/src/client/app/desktop/views/components/drive.nav-folder.vue
@@ -68,9 +68,9 @@ export default Vue.extend({
 
 			// ファイルだったら
 			if (e.dataTransfer.files.length > 0) {
-				Array.from(e.dataTransfer.files).forEach(file => {
+				for (const file of Array.from(e.dataTransfer.files)) {
 					this.browser.upload(file, this.folder);
-				});
+				}
 				return;
 			}
 
diff --git a/src/client/app/desktop/views/components/drive.vue b/src/client/app/desktop/views/components/drive.vue
index 068d8a844..144c4f88f 100644
--- a/src/client/app/desktop/views/components/drive.vue
+++ b/src/client/app/desktop/views/components/drive.vue
@@ -277,9 +277,9 @@ export default Vue.extend({
 
 			// ドロップされてきたものがファイルだったら
 			if (e.dataTransfer.files.length > 0) {
-				Array.from(e.dataTransfer.files).forEach(file => {
+				for (const file of Array.from(e.dataTransfer.files)) {
 					this.upload(file, this.folder);
-				});
+				}
 				return;
 			}
 
@@ -368,9 +368,9 @@ export default Vue.extend({
 		},
 
 		onChangeFileInput() {
-			Array.from((this.$refs.fileInput as any).files).forEach(file => {
+			for (const file of Array.from((this.$refs.fileInput as any).files)) {
 				this.upload(file, this.folder);
-			});
+			}
 		},
 
 		upload(file, folder) {
@@ -549,8 +549,8 @@ export default Vue.extend({
 			let flag = false;
 			const complete = () => {
 				if (flag) {
-					fetchedFolders.forEach(this.appendFolder);
-					fetchedFiles.forEach(this.appendFile);
+					for (const x of fetchedFolders) this.appendFolder(x);
+					for (const x of fetchedFiles) this.appendFile(x);
 					this.fetching = false;
 				} else {
 					flag = true;
@@ -575,7 +575,7 @@ export default Vue.extend({
 				} else {
 					this.moreFiles = false;
 				}
-				files.forEach(this.appendFile);
+				for (const x of files) this.appendFile(x);
 				this.fetching = false;
 			});
 		}
diff --git a/src/client/app/desktop/views/components/emoji-picker-dialog.vue b/src/client/app/desktop/views/components/emoji-picker-dialog.vue
index 06dbe7584..0b18a8500 100644
--- a/src/client/app/desktop/views/components/emoji-picker-dialog.vue
+++ b/src/client/app/desktop/views/components/emoji-picker-dialog.vue
@@ -43,9 +43,9 @@ export default Vue.extend({
 			this.$el.style.left = x + 'px';
 			this.$el.style.top = y + 'px';
 
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.addEventListener('mousedown', this.onMousedown);
-			});
+			}
 		});
 	},
 
@@ -62,9 +62,9 @@ export default Vue.extend({
 		},
 
 		close() {
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.removeEventListener('mousedown', this.onMousedown);
-			});
+			}
 
 			this.$emit('closed');
 			this.destroyDom();
diff --git a/src/client/app/desktop/views/components/home.vue b/src/client/app/desktop/views/components/home.vue
index cc0b48e89..18cb21520 100644
--- a/src/client/app/desktop/views/components/home.vue
+++ b/src/client/app/desktop/views/components/home.vue
@@ -102,23 +102,23 @@ const defaultDesktopHomeWidgets = {
 //#region Construct home data
 const _defaultDesktopHomeWidgets = [];
 
-defaultDesktopHomeWidgets.left.forEach(widget => {
+for (const widget of defaultDesktopHomeWidgets.left) {
 	_defaultDesktopHomeWidgets.push({
 		name: widget,
 		id: uuid(),
 		place: 'left',
 		data: {}
 	});
-});
+}
 
-defaultDesktopHomeWidgets.right.forEach(widget => {
+for (const widget of defaultDesktopHomeWidgets.right) {
 	_defaultDesktopHomeWidgets.push({
 		name: widget,
 		id: uuid(),
 		place: 'right',
 		data: {}
 	});
-});
+}
 //#endregion
 
 export default Vue.extend({
@@ -220,8 +220,8 @@ export default Vue.extend({
 			const left = this.widgets.left;
 			const right = this.widgets.right;
 			this.$store.commit('settings/setHome', left.concat(right));
-			left.forEach(w => w.place = 'left');
-			right.forEach(w => w.place = 'right');
+			for (const w of left) w.place = 'left';
+			for (const w of right) w.place = 'right';
 			this.$root.api('i/update_home', {
 				home: this.home
 			});
diff --git a/src/client/app/desktop/views/components/notes.vue b/src/client/app/desktop/views/components/notes.vue
index 0e710feb6..eb108e4e5 100644
--- a/src/client/app/desktop/views/components/notes.vue
+++ b/src/client/app/desktop/views/components/notes.vue
@@ -156,7 +156,9 @@ export default Vue.extend({
 		},
 
 		releaseQueue() {
-			this.queue.forEach(n => this.prepend(n, true));
+			for (const n of this.queue) {
+				this.prepend(n, true);
+			}
 			this.queue = [];
 		},
 
diff --git a/src/client/app/desktop/views/components/post-form.vue b/src/client/app/desktop/views/components/post-form.vue
index 5b6fc4cd4..ef236e96b 100644
--- a/src/client/app/desktop/views/components/post-form.vue
+++ b/src/client/app/desktop/views/components/post-form.vue
@@ -184,7 +184,8 @@ export default Vue.extend({
 		if (this.reply && this.reply.text != null) {
 			const ast = parse(this.reply.text);
 
-			ast.filter(t => t.type == 'mention').forEach(x => {
+			// TODO: 新しいMFMパーサに対応
+			for (const x of ast.filter(t => t.type == 'mention')) {
 				const mention = x.host ? `@${x.username}@${toASCII(x.host)}` : `@${x.username}`;
 
 				// 自分は除外
@@ -195,7 +196,7 @@ export default Vue.extend({
 				if (this.text.indexOf(`${mention} `) != -1) return;
 
 				this.text += `${mention} `;
-			});
+			}
 		}
 
 		// デフォルト公開範囲
@@ -261,7 +262,7 @@ export default Vue.extend({
 			this.$chooseDriveFile({
 				multiple: true
 			}).then(files => {
-				files.forEach(this.attachMedia);
+				for (const x of files) this.attachMedia(x);
 			});
 		},
 
@@ -276,7 +277,7 @@ export default Vue.extend({
 		},
 
 		onChangeFile() {
-			Array.from((this.$refs.file as any).files).forEach(this.upload);
+			for (const x of Array.from((this.$refs.file as any).files)) this.upload(x);
 		},
 
 		onPollUpdate() {
@@ -304,11 +305,11 @@ export default Vue.extend({
 		},
 
 		onPaste(e) {
-			Array.from(e.clipboardData.items).forEach((item: any) => {
+			for (const item of Array.from(e.clipboardData.items)) {
 				if (item.kind == 'file') {
 					this.upload(item.getAsFile());
 				}
-			});
+			}
 		},
 
 		onDragover(e) {
@@ -335,7 +336,7 @@ export default Vue.extend({
 			// ファイルだったら
 			if (e.dataTransfer.files.length > 0) {
 				e.preventDefault();
-				Array.from(e.dataTransfer.files).forEach(this.upload);
+				for (const x of Array.from(e.dataTransfer.files)) this.upload(x);
 				return;
 			}
 
diff --git a/src/client/app/desktop/views/components/timeline.core.vue b/src/client/app/desktop/views/components/timeline.core.vue
index f22ab4900..9662157e3 100644
--- a/src/client/app/desktop/views/components/timeline.core.vue
+++ b/src/client/app/desktop/views/components/timeline.core.vue
@@ -149,7 +149,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/components/ui.header.account.vue b/src/client/app/desktop/views/components/ui.header.account.vue
index a16f16455..09f407b0e 100644
--- a/src/client/app/desktop/views/components/ui.header.account.vue
+++ b/src/client/app/desktop/views/components/ui.header.account.vue
@@ -120,15 +120,15 @@ export default Vue.extend({
 		},
 		open() {
 			this.isOpen = true;
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.addEventListener('mousedown', this.onMousedown);
-			});
+			}
 		},
 		close() {
 			this.isOpen = false;
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.removeEventListener('mousedown', this.onMousedown);
-			});
+			}
 		},
 		onMousedown(e) {
 			e.preventDefault();
diff --git a/src/client/app/desktop/views/components/ui.header.notifications.vue b/src/client/app/desktop/views/components/ui.header.notifications.vue
index b83a5da04..ddd1b8661 100644
--- a/src/client/app/desktop/views/components/ui.header.notifications.vue
+++ b/src/client/app/desktop/views/components/ui.header.notifications.vue
@@ -42,16 +42,16 @@ export default Vue.extend({
 
 		open() {
 			this.isOpen = true;
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.addEventListener('mousedown', this.onMousedown);
-			});
+			}
 		},
 
 		close() {
 			this.isOpen = false;
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.removeEventListener('mousedown', this.onMousedown);
-			});
+			}
 		},
 
 		onMousedown(e) {
diff --git a/src/client/app/desktop/views/components/ui.sidebar.vue b/src/client/app/desktop/views/components/ui.sidebar.vue
index 9bf68f1ef..8b5f14290 100644
--- a/src/client/app/desktop/views/components/ui.sidebar.vue
+++ b/src/client/app/desktop/views/components/ui.sidebar.vue
@@ -171,16 +171,16 @@ export default Vue.extend({
 
 		openNotifications() {
 			this.showNotifications = true;
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.addEventListener('mousedown', this.onMousedown);
-			});
+			}
 		},
 
 		closeNotifications() {
 			this.showNotifications = false;
-			Array.from(document.querySelectorAll('body *')).forEach(el => {
+			for (const el of Array.from(document.querySelectorAll('body *'))) {
 				el.removeEventListener('mousedown', this.onMousedown);
-			});
+			}
 		},
 
 		onMousedown(e) {
diff --git a/src/client/app/desktop/views/components/user-list-timeline.vue b/src/client/app/desktop/views/components/user-list-timeline.vue
index 7bdc016c6..8afd95a68 100644
--- a/src/client/app/desktop/views/components/user-list-timeline.vue
+++ b/src/client/app/desktop/views/components/user-list-timeline.vue
@@ -79,7 +79,7 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) (this.$refs.timeline as any).append(n);
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/components/window.vue b/src/client/app/desktop/views/components/window.vue
index 1fac38842..7eaeed9ad 100644
--- a/src/client/app/desktop/views/components/window.vue
+++ b/src/client/app/desktop/views/components/window.vue
@@ -234,12 +234,12 @@ export default Vue.extend({
 		top() {
 			let z = 0;
 
-			this.$root.os.windows.getAll().forEach(w => {
-				if (w == this) return;
+			const ws = this.$root.os.windows.getAll().filter(w => w != this);
+			for (const w of ws) {
 				const m = w.$refs.main;
 				const mz = Number(document.defaultView.getComputedStyle(m, null).zIndex);
 				if (mz > z) z = mz;
-			});
+			}
 
 			if (z > 0) {
 				(this.$refs.main as any).style.zIndex = z + 1;
diff --git a/src/client/app/desktop/views/pages/deck/deck.column.vue b/src/client/app/desktop/views/pages/deck/deck.column.vue
index 13f7638a0..a84dbdcdc 100644
--- a/src/client/app/desktop/views/pages/deck/deck.column.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.column.vue
@@ -224,7 +224,9 @@ export default Vue.extend({
 
 			if (this.menu) {
 				items.unshift(null);
-				this.menu.reverse().forEach(i => items.unshift(i));
+				for (const i of this.menu.reverse()) {
+					items.unshift(i);
+				}
 			}
 
 			return items;
diff --git a/src/client/app/desktop/views/pages/deck/deck.direct.vue b/src/client/app/desktop/views/pages/deck/deck.direct.vue
index 2ceb82ca1..c6c2b9923 100644
--- a/src/client/app/desktop/views/pages/deck/deck.direct.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.direct.vue
@@ -77,7 +77,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.hashtag-tl.vue b/src/client/app/desktop/views/pages/deck/deck.hashtag-tl.vue
index 611bcce4e..9a70733fd 100644
--- a/src/client/app/desktop/views/pages/deck/deck.hashtag-tl.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.hashtag-tl.vue
@@ -102,7 +102,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.list-tl.vue b/src/client/app/desktop/views/pages/deck/deck.list-tl.vue
index d65745f06..68fbbb3ff 100644
--- a/src/client/app/desktop/views/pages/deck/deck.list-tl.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.list-tl.vue
@@ -104,7 +104,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.mentions.vue b/src/client/app/desktop/views/pages/deck/deck.mentions.vue
index 9921b3ca0..5fcabde5d 100644
--- a/src/client/app/desktop/views/pages/deck/deck.mentions.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.mentions.vue
@@ -75,7 +75,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.notes.vue b/src/client/app/desktop/views/pages/deck/deck.notes.vue
index b484561fd..fd9042656 100644
--- a/src/client/app/desktop/views/pages/deck/deck.notes.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.notes.vue
@@ -164,7 +164,9 @@ export default Vue.extend({
 		},
 
 		releaseQueue() {
-			this.queue.forEach(n => this.prepend(n, true));
+			for (const n of this.queue) {
+				this.prepend(n, true);
+			}
 			this.queue = [];
 		},
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.notifications.vue b/src/client/app/desktop/views/pages/deck/deck.notifications.vue
index 430d7d9b2..60b02bc1f 100644
--- a/src/client/app/desktop/views/pages/deck/deck.notifications.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.notifications.vue
@@ -142,7 +142,9 @@ export default Vue.extend({
 		},
 
 		releaseQueue() {
-			this.queue.forEach(n => this.prepend(n));
+			for (const n of this.queue) {
+				this.prepend(n);
+			}
 			this.queue = [];
 		},
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.tl.vue b/src/client/app/desktop/views/pages/deck/deck.tl.vue
index 3e8767082..4f5e3af19 100644
--- a/src/client/app/desktop/views/pages/deck/deck.tl.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.tl.vue
@@ -123,7 +123,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/deck/deck.user-column.vue b/src/client/app/desktop/views/pages/deck/deck.user-column.vue
index 6f0b38434..3e54bbc13 100644
--- a/src/client/app/desktop/views/pages/deck/deck.user-column.vue
+++ b/src/client/app/desktop/views/pages/deck/deck.user-column.vue
@@ -167,11 +167,11 @@ export default Vue.extend({
 				limit: 9,
 				untilDate: new Date().getTime() + 1000 * 86400 * 365
 			}).then(notes => {
-				notes.forEach(note => {
-					note.files.forEach(file => {
+				for (const note of notes) {
+					for (const file of note.files) {
 						file._note = note;
-					});
-				});
+					}
+				}
 				const files = concat(notes.map((n: any): any[] => n.files));
 				this.images = files.filter(f => image.includes(f.type)).slice(0, 9);
 			});
@@ -298,7 +298,7 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) (this.$refs.timeline as any).append(n);
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/search.vue b/src/client/app/desktop/views/pages/search.vue
index ff644a62d..fc31673ba 100644
--- a/src/client/app/desktop/views/pages/search.vue
+++ b/src/client/app/desktop/views/pages/search.vue
@@ -94,7 +94,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/tag.vue b/src/client/app/desktop/views/pages/tag.vue
index 9245f69c9..29e26b6d0 100644
--- a/src/client/app/desktop/views/pages/tag.vue
+++ b/src/client/app/desktop/views/pages/tag.vue
@@ -83,7 +83,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/pages/user/user.photos.vue b/src/client/app/desktop/views/pages/user/user.photos.vue
index 42436ea47..d2723d2cf 100644
--- a/src/client/app/desktop/views/pages/user/user.photos.vue
+++ b/src/client/app/desktop/views/pages/user/user.photos.vue
@@ -30,11 +30,11 @@ export default Vue.extend({
 			limit: 9,
 			untilDate: new Date().getTime() + 1000 * 86400 * 365
 		}).then(notes => {
-			notes.forEach(note => {
-				note.files.forEach(file => {
+			for (const note of notes) {
+				for (const file of note.files) {
 					if (this.images.length < 9) this.images.push(file);
-				});
-			});
+				}
+			}
 			this.fetching = false;
 		});
 	}
diff --git a/src/client/app/desktop/views/pages/user/user.timeline.vue b/src/client/app/desktop/views/pages/user/user.timeline.vue
index 357a87062..6d1b23b40 100644
--- a/src/client/app/desktop/views/pages/user/user.timeline.vue
+++ b/src/client/app/desktop/views/pages/user/user.timeline.vue
@@ -95,7 +95,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/desktop/views/widgets/post-form.vue b/src/client/app/desktop/views/widgets/post-form.vue
index 5c8d25ac6..622e5c334 100644
--- a/src/client/app/desktop/views/widgets/post-form.vue
+++ b/src/client/app/desktop/views/widgets/post-form.vue
@@ -99,7 +99,7 @@ export default define({
 			this.$chooseDriveFile({
 				multiple: true
 			}).then(files => {
-				files.forEach(this.attachMedia);
+				for (const x of files) this.attachMedia(x);
 			});
 		},
 
@@ -118,15 +118,15 @@ export default define({
 		},
 
 		onPaste(e) {
-			Array.from(e.clipboardData.items).forEach((item: any) => {
+			for (const item of Array.from(e.clipboardData.items)) {
 				if (item.kind == 'file') {
 					this.upload(item.getAsFile());
 				}
-			});
+			}
 		},
 
 		onChangeFile() {
-			Array.from((this.$refs.file as any).files).forEach(this.upload);
+			for (const x of Array.from((this.$refs.file as any).files)) this.upload(x);
 		},
 
 		upload(file) {
@@ -146,7 +146,7 @@ export default define({
 			// ファイルだったら
 			if (e.dataTransfer.files.length > 0) {
 				e.preventDefault();
-				Array.from(e.dataTransfer.files).forEach(this.upload);
+				for (const x of Array.from(e.dataTransfer.files)) this.upload(x);
 				return;
 			}
 
diff --git a/src/client/app/mobile/views/components/drive.vue b/src/client/app/mobile/views/components/drive.vue
index e7a5d9983..5fb160f91 100644
--- a/src/client/app/mobile/views/components/drive.vue
+++ b/src/client/app/mobile/views/components/drive.vue
@@ -297,8 +297,8 @@ export default Vue.extend({
 			let flag = false;
 			const complete = () => {
 				if (flag) {
-					fetchedFolders.forEach(this.appendFolder);
-					fetchedFiles.forEach(this.appendFile);
+					for (const x of fetchedFolders) this.appendFolder(x);
+					for (const x of fetchedFiles) this.appendFile(x);
 					this.fetching = false;
 
 					// 一連の読み込みが完了したイベントを発行
@@ -336,7 +336,7 @@ export default Vue.extend({
 				} else {
 					this.moreFiles = false;
 				}
-				files.forEach(this.appendFile);
+				for (const x of files) this.appendFile(x);
 				this.fetching = false;
 				this.fetchingMoreFiles = false;
 			});
@@ -460,8 +460,9 @@ export default Vue.extend({
 		},
 
 		onChangeLocalFile() {
-			Array.from((this.$refs.file as any).files)
-				.forEach(f => (this.$refs.uploader as any).upload(f, this.folder));
+			for (const f of Array.from((this.$refs.file as any).files)) {
+				(this.$refs.uploader as any).upload(f, this.folder);
+			}
 		}
 	}
 });
diff --git a/src/client/app/mobile/views/components/notes.vue b/src/client/app/mobile/views/components/notes.vue
index 4f0db3e27..088ecd5de 100644
--- a/src/client/app/mobile/views/components/notes.vue
+++ b/src/client/app/mobile/views/components/notes.vue
@@ -149,7 +149,9 @@ export default Vue.extend({
 		},
 
 		releaseQueue() {
-			this.queue.forEach(n => this.prepend(n, true));
+			for (const n of this.queue) {
+				this.prepend(n, true);
+			}
 			this.queue = [];
 		},
 
diff --git a/src/client/app/mobile/views/components/post-form.vue b/src/client/app/mobile/views/components/post-form.vue
index 52bb5f966..28e008279 100644
--- a/src/client/app/mobile/views/components/post-form.vue
+++ b/src/client/app/mobile/views/components/post-form.vue
@@ -174,7 +174,7 @@ export default Vue.extend({
 		if (this.reply && this.reply.text != null) {
 			const ast = parse(this.reply.text);
 
-			ast.filter(t => t.type == 'mention').forEach(x => {
+			for (const x of ast.filter(t => t.type == 'mention')) {
 				const mention = x.host ? `@${x.username}@${toASCII(x.host)}` : `@${x.username}`;
 
 				// 自分は除外
@@ -185,7 +185,7 @@ export default Vue.extend({
 				if (this.text.indexOf(`${mention} `) != -1) return;
 
 				this.text += `${mention} `;
-			});
+			}
 		}
 
 		// デフォルト公開範囲
@@ -241,7 +241,7 @@ export default Vue.extend({
 			this.$chooseDriveFile({
 				multiple: true
 			}).then(files => {
-				files.forEach(this.attachMedia);
+				for (const x of files) this.attachMedia(x);
 			});
 		},
 
@@ -256,7 +256,7 @@ export default Vue.extend({
 		},
 
 		onChangeFile() {
-			Array.from((this.$refs.file as any).files).forEach(this.upload);
+			for (const x of Array.from((this.$refs.file as any).files)) this.upload(x);
 		},
 
 		onPollUpdate() {
diff --git a/src/client/app/mobile/views/components/user-list-timeline.vue b/src/client/app/mobile/views/components/user-list-timeline.vue
index a9597319d..d90051710 100644
--- a/src/client/app/mobile/views/components/user-list-timeline.vue
+++ b/src/client/app/mobile/views/components/user-list-timeline.vue
@@ -94,7 +94,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/mobile/views/components/user-timeline.vue b/src/client/app/mobile/views/components/user-timeline.vue
index e8d7adc8b..0d0bbc407 100644
--- a/src/client/app/mobile/views/components/user-timeline.vue
+++ b/src/client/app/mobile/views/components/user-timeline.vue
@@ -76,7 +76,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/mobile/views/pages/home.timeline.vue b/src/client/app/mobile/views/pages/home.timeline.vue
index 0699a169e..91c99bc8f 100644
--- a/src/client/app/mobile/views/pages/home.timeline.vue
+++ b/src/client/app/mobile/views/pages/home.timeline.vue
@@ -150,7 +150,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/mobile/views/pages/search.vue b/src/client/app/mobile/views/pages/search.vue
index fbabfdf6a..669e0b740 100644
--- a/src/client/app/mobile/views/pages/search.vue
+++ b/src/client/app/mobile/views/pages/search.vue
@@ -77,7 +77,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/mobile/views/pages/tag.vue b/src/client/app/mobile/views/pages/tag.vue
index aaf878ce4..e0c9f6494 100644
--- a/src/client/app/mobile/views/pages/tag.vue
+++ b/src/client/app/mobile/views/pages/tag.vue
@@ -72,7 +72,9 @@ export default Vue.extend({
 				} else {
 					this.existMore = false;
 				}
-				notes.forEach(n => (this.$refs.timeline as any).append(n));
+				for (const n of notes) {
+					(this.$refs.timeline as any).append(n);
+				}
 				this.moreFetching = false;
 			});
 
diff --git a/src/client/app/mobile/views/pages/user/home.photos.vue b/src/client/app/mobile/views/pages/user/home.photos.vue
index 320b102b0..4fb5b90ff 100644
--- a/src/client/app/mobile/views/pages/user/home.photos.vue
+++ b/src/client/app/mobile/views/pages/user/home.photos.vue
@@ -32,14 +32,16 @@ export default Vue.extend({
 			limit: 6,
 			untilDate: new Date().getTime() + 1000 * 86400 * 365
 		}).then(notes => {
-			notes.forEach(note => {
-				note.media.forEach(media => {
-					if (this.images.length < 9) this.images.push({
-						note,
-						media
-					});
-				});
-			});
+			for (const note of notes) {
+				for (const media of note.media) {
+					if (this.images.length < 9) {
+						this.images.push({
+							note,
+							media
+						});
+					}
+				}
+			}
 			this.fetching = false;
 		});
 	}
diff --git a/src/client/app/store.ts b/src/client/app/store.ts
index 633170e37..f2c301bcb 100644
--- a/src/client/app/store.ts
+++ b/src/client/app/store.ts
@@ -136,9 +136,9 @@ export default (os: MiOS) => new Vuex.Store({
 		},
 
 		mergeMe(ctx, me) {
-			Object.entries(me).forEach(([key, value]) => {
+			for (const [key, value] of Object.entries(me)) {
 				ctx.commit('updateIKeyValue', { key, value });
-			});
+			}
 
 			if (me.clientSettings) {
 				ctx.dispatch('settings/merge', me.clientSettings);
@@ -215,11 +215,11 @@ export default (os: MiOS) => new Vuex.Store({
 
 					//#region Deck
 					if (state.deck && state.deck.columns) {
-						state.deck.columns.filter(c => c.type == 'widgets').forEach(c => {
-							c.widgets.forEach(w => {
-								if (w.id == x.id) w.data = x.data;
-							});
-						});
+						for (const c of state.deck.columns.filter(c => c.type == 'widgets')) {
+							for (const w of c.widgets.filter(w => w.id == x.id)) {
+								w.data = x.data;
+							}
+						}
 					}
 					//#endregion
 				},
@@ -345,9 +345,9 @@ export default (os: MiOS) => new Vuex.Store({
 			actions: {
 				merge(ctx, settings) {
 					if (settings == null) return;
-					Object.entries(settings).forEach(([key, value]) => {
+					for (const [key, value] of Object.entries(settings)) {
 						ctx.commit('set', { key, value });
-					});
+					}
 				},
 
 				set(ctx, x) {
diff --git a/src/client/app/sw.js b/src/client/app/sw.js
index d381bfb7a..ccf6dc818 100644
--- a/src/client/app/sw.js
+++ b/src/client/app/sw.js
@@ -62,6 +62,8 @@ self.addEventListener('push', ev => {
 
 self.addEventListener('message', ev => {
 	if (ev.data == 'clear') {
-		caches.keys().then(keys => keys.forEach(key => caches.delete(key)));
+		caches.keys().then(keys => {
+			for (const key of keys) caches.delete(key);
+		});
 	}
 });
diff --git a/src/client/app/theme.ts b/src/client/app/theme.ts
index 9c5be74fa..de6546c5b 100644
--- a/src/client/app/theme.ts
+++ b/src/client/app/theme.ts
@@ -36,9 +36,9 @@ export function applyTheme(theme: Theme, persisted = true) {
 
 	const props = compile(_theme);
 
-	Object.entries(props).forEach(([k, v]) => {
+	for (const [k, v] of Object.entries(props)) {
 		document.documentElement.style.setProperty(`--${k}`, v.toString());
-	});
+	}
 
 	if (persisted) {
 		localStorage.setItem('theme', JSON.stringify(props));
@@ -74,10 +74,9 @@ function compile(theme: Theme): { [key: string]: string } {
 
 	const props = {};
 
-	Object.entries(theme.props).forEach(([k, v]) => {
-		const c = getColor(v);
-		props[k] = genValue(c);
-	});
+	for (const [k, v] of Object.entries(theme.props)) {
+		props[k] = genValue(getColor(v));
+	}
 
 	const primary = getColor(props['primary']);
 
diff --git a/src/mfm/html-to-mfm.ts b/src/mfm/html-to-mfm.ts
index 9a9fbbb86..dcd0e7fa7 100644
--- a/src/mfm/html-to-mfm.ts
+++ b/src/mfm/html-to-mfm.ts
@@ -8,7 +8,9 @@ export default function(html: string): string {
 
 	let text = '';
 
-	dom.childNodes.forEach((n: any) => analyze(n));
+	for (const n of dom.childNodes) {
+		analyze(n);
+	}
 
 	return text.trim();
 
@@ -61,13 +63,17 @@ export default function(html: string): string {
 			case 'p':
 				text += '\n\n';
 				if (node.childNodes) {
-					node.childNodes.forEach((n: any) => analyze(n));
+					for (const n of node.childNodes) {
+						analyze(n);
+					}
 				}
 				break;
 
 			default:
 				if (node.childNodes) {
-					node.childNodes.forEach((n: any) => analyze(n));
+					for (const n of node.childNodes) {
+						analyze(n);
+					}
 				}
 				break;
 		}
diff --git a/src/mfm/parse.ts b/src/mfm/parse.ts
index 0dc749a5f..58e126be3 100644
--- a/src/mfm/parse.ts
+++ b/src/mfm/parse.ts
@@ -17,21 +17,20 @@ export default (source: string, plainText = false): Node[] => {
 			es[0].name === 'text' ? [combineText(es)] : es
 		));
 
-	const concatTextRecursive = (es: Node[]): void =>
-		es.filter(x => x.children).forEach(x => {
+	const concatTextRecursive = (es: Node[]): void => {
+		for (const x of es.filter(x => x.children)) {
 			x.children = concatText(x.children);
 			concatTextRecursive(x.children);
-		});
+		}
+	};
 
 	nodes = concatText(nodes);
 	concatTextRecursive(nodes);
 
 	const removeEmptyTextNodes = (nodes: Node[]) => {
-		nodes.forEach(n => {
-			if (n.children) {
-				n.children = removeEmptyTextNodes(n.children);
-			}
-		});
+		for (const n of nodes.filter(n => n.children)) {
+			n.children = removeEmptyTextNodes(n.children);
+		}
 		return nodes.filter(n => !(n.name == 'text' && n.props.text == ''));
 	};
 
diff --git a/src/prelude/array.ts b/src/prelude/array.ts
index 5f694b1d3..5a8f36450 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -34,6 +34,10 @@ export function sum(xs: number[]): number {
 	return xs.reduce((a, b) => a + b, 0);
 }
 
+export function maximum(xs: number[]): number {
+	return Math.max(...xs);
+}
+
 export function groupBy<T>(f: (x: T, y: T) => boolean, xs: T[]): T[][] {
 	const groups = [] as T[][];
 	for (const x of xs) {
diff --git a/src/push-sw.ts b/src/push-sw.ts
index d30965f80..2c09d0547 100644
--- a/src/push-sw.ts
+++ b/src/push-sw.ts
@@ -23,7 +23,7 @@ export default async function(userId: mongo.ObjectID | string, type: string, bod
 		userId: userId
 	});
 
-	subscriptions.forEach(subscription => {
+	for (const subscription of subscriptions) {
 		const pushSubscription = {
 			endpoint: subscription.endpoint,
 			keys: {
@@ -48,5 +48,5 @@ export default async function(userId: mongo.ObjectID | string, type: string, bod
 				});
 			}
 		});
-	});
+	}
 }
diff --git a/src/server/api/endpoints/aggregation/hashtags.ts b/src/server/api/endpoints/aggregation/hashtags.ts
index 45d709f77..7577711b5 100644
--- a/src/server/api/endpoints/aggregation/hashtags.ts
+++ b/src/server/api/endpoints/aggregation/hashtags.ts
@@ -47,10 +47,7 @@ export default define(meta, (ps) => new Promise(async (res, rej) => {
 	}> = [];
 
 	// カウント
-	data.map(x => x._id).forEach(x => {
-		// ブラックリストに登録されているタグなら弾く
-		if (hidedTags.includes(x.tag)) return;
-
+	for (const x of data.map(x => x._id).filter(x => !hidedTags.includes(x.tag))) {
 		const i = tags.findIndex(tag => tag.name == x.tag);
 		if (i != -1) {
 			tags[i].count++;
@@ -60,7 +57,7 @@ export default define(meta, (ps) => new Promise(async (res, rej) => {
 				count: 1
 			});
 		}
-	});
+	}
 
 	// タグを人気順に並べ替え
 	tags.sort((a, b) => b.count - a.count);
diff --git a/src/server/api/endpoints/drive/files/update.ts b/src/server/api/endpoints/drive/files/update.ts
index a5835c6d6..7f9eb7bad 100644
--- a/src/server/api/endpoints/drive/files/update.ts
+++ b/src/server/api/endpoints/drive/files/update.ts
@@ -100,14 +100,14 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	Note.find({
 		'_files._id': file._id
 	}).then(notes => {
-		notes.forEach(note => {
+		for (const note of notes) {
 			note._files[note._files.findIndex(f => f._id.equals(file._id))] = file;
 			Note.update({ _id: note._id }, {
 				$set: {
 					_files: note._files
 				}
 			});
-		});
+		}
 	});
 
 	// Serialize
diff --git a/src/server/api/endpoints/games/reversi/games/show.ts b/src/server/api/endpoints/games/reversi/games/show.ts
index c74720235..088245610 100644
--- a/src/server/api/endpoints/games/reversi/games/show.ts
+++ b/src/server/api/endpoints/games/reversi/games/show.ts
@@ -25,9 +25,8 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 		loopedBoard: game.settings.loopedBoard
 	});
 
-	game.logs.forEach(log => {
+	for (const log of game.logs)
 		o.put(log.color, log.pos);
-	});
 
 	const packed = await pack(game, user);
 
diff --git a/src/server/api/endpoints/hashtags/trend.ts b/src/server/api/endpoints/hashtags/trend.ts
index ed4c8e337..a26dbf094 100644
--- a/src/server/api/endpoints/hashtags/trend.ts
+++ b/src/server/api/endpoints/hashtags/trend.ts
@@ -58,10 +58,7 @@ export default define(meta, () => new Promise(async (res, rej) => {
 	}> = [];
 
 	// カウント
-	data.map(x => x._id).forEach(x => {
-		// ブラックリストに登録されているタグなら弾く
-		if (hidedTags.includes(x.tag)) return;
-
+	for (const x of data.map(x => x._id).filter(x => !hidedTags.includes(x.tag))) {
 		const i = tags.findIndex(tag => tag.name == x.tag);
 		if (i != -1) {
 			tags[i].count++;
@@ -71,7 +68,7 @@ export default define(meta, () => new Promise(async (res, rej) => {
 				count: 1
 			});
 		}
-	});
+	}
 
 	// 最低要求投稿者数を下回るならカットする
 	const limitedTags = tags.filter(tag => tag.count >= requiredUsers);
diff --git a/src/server/api/endpoints/i/update_widget.ts b/src/server/api/endpoints/i/update_widget.ts
index 90fe8fbe2..da96ec6fc 100644
--- a/src/server/api/endpoints/i/update_widget.ts
+++ b/src/server/api/endpoints/i/update_widget.ts
@@ -59,11 +59,11 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	//#region Deck
 	if (widget == null && user.clientSettings.deck && user.clientSettings.deck.columns) {
 		const deck = user.clientSettings.deck;
-		deck.columns.filter((c: any) => c.type == 'widgets').forEach((c: any) => {
-			c.widgets.forEach((w: any) => {
-				if (w.id == ps.id) widget = w;
-			});
-		});
+		for (const c of deck.columns.filter((c: any) => c.type == 'widgets')) {
+			for (const w of c.widgets.filter((w: any) => w.id == ps.id)) {
+				widget = w;
+			}
+		}
 		if (widget) {
 				widget.data = ps.data;
 
diff --git a/src/server/api/endpoints/notes/mentions.ts b/src/server/api/endpoints/notes/mentions.ts
index 718f5e440..a353165cd 100644
--- a/src/server/api/endpoints/notes/mentions.ts
+++ b/src/server/api/endpoints/notes/mentions.ts
@@ -91,5 +91,7 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 
 	res(await packMany(mentions, user));
 
-	mentions.forEach(note => read(user._id, note._id));
+	for (const note of mentions) {
+		read(user._id, note._id);
+	}
 }));
diff --git a/src/server/api/endpoints/notes/polls/vote.ts b/src/server/api/endpoints/notes/polls/vote.ts
index dc012152c..8de0eb420 100644
--- a/src/server/api/endpoints/notes/polls/vote.ts
+++ b/src/server/api/endpoints/notes/polls/vote.ts
@@ -102,12 +102,12 @@ export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 			}
 		})
 		.then(watchers => {
-			watchers.forEach(watcher => {
+			for (const watcher of watchers) {
 				notify(watcher.userId, user._id, 'poll_vote', {
 					noteId: note._id,
 					choice: ps.choice
 				});
-			});
+			}
 		});
 
 	// この投稿をWatchする
diff --git a/src/server/api/endpoints/users/get_frequently_replied_users.ts b/src/server/api/endpoints/users/get_frequently_replied_users.ts
index cf123b82b..353ccef1e 100644
--- a/src/server/api/endpoints/users/get_frequently_replied_users.ts
+++ b/src/server/api/endpoints/users/get_frequently_replied_users.ts
@@ -2,6 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
 import User, { pack } from '../../../../models/user';
 import define from '../../define';
+import { maximum } from '../../../../prelude/array';
 
 export const meta = {
 	requireCredential: false,
@@ -77,20 +78,16 @@ export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	const repliedUsers: any = {};
 
 	// Extract replies from recent notes
-	replyTargetNotes.forEach(note => {
-		const userId = note.userId.toString();
+	for (const userId of replyTargetNotes.map(x => x.userId.toString())) {
 		if (repliedUsers[userId]) {
 			repliedUsers[userId]++;
 		} else {
 			repliedUsers[userId] = 1;
 		}
-	});
+	}
 
 	// Calc peak
-	let peak = 0;
-	Object.keys(repliedUsers).forEach(user => {
-		if (repliedUsers[user] > peak) peak = repliedUsers[user];
-	});
+	const peak = maximum(Object.values(repliedUsers));
 
 	// Sort replies by frequency
 	const repliedUsersSorted = Object.keys(repliedUsers).sort((a, b) => repliedUsers[b] - repliedUsers[a]);
diff --git a/src/server/api/index.ts b/src/server/api/index.ts
index ebb3d5a27..04fc8759f 100644
--- a/src/server/api/index.ts
+++ b/src/server/api/index.ts
@@ -41,10 +41,13 @@ const router = new Router();
 /**
  * Register endpoint handlers
  */
-endpoints.forEach(endpoint => endpoint.meta.requireFile
-	? router.post(`/${endpoint.name}`, upload.single('file'), handler.bind(null, endpoint))
-	: router.post(`/${endpoint.name}`, handler.bind(null, endpoint))
-);
+for (const endpoint of endpoints) {
+	if (endpoint.meta.requireFile) {
+		router.post(`/${endpoint.name}`, upload.single('file'), handler.bind(null, endpoint));
+	} else {
+		router.post(`/${endpoint.name}`, handler.bind(null, endpoint));
+	}
+}
 
 router.post('/signup', require('./private/signup').default);
 router.post('/signin', require('./private/signin').default);
diff --git a/src/server/api/stream/channels/games/reversi-game.ts b/src/server/api/stream/channels/games/reversi-game.ts
index f287ad010..1cb077c8c 100644
--- a/src/server/api/stream/channels/games/reversi-game.ts
+++ b/src/server/api/stream/channels/games/reversi-game.ts
@@ -242,9 +242,9 @@ export default class extends Channel {
 			loopedBoard: game.settings.loopedBoard
 		});
 
-		game.logs.forEach(log => {
+		for (const log of game.logs) {
 			o.put(log.color, log.pos);
-		});
+		}
 
 		const myColor =
 			(game.user1Id.equals(this.user._id) && game.black == 1) || (game.user2Id.equals(this.user._id) && game.black == 2)
diff --git a/src/server/api/stream/index.ts b/src/server/api/stream/index.ts
index 3119e20af..22f7646cb 100644
--- a/src/server/api/stream/index.ts
+++ b/src/server/api/stream/index.ts
@@ -213,8 +213,8 @@ export default class Connection {
 	 */
 	@autobind
 	public dispose() {
-		this.channels.forEach(c => {
-			if (c.dispose) c.dispose();
-		});
+		for (const c of this.channels.filter(c => c.dispose)) {
+			c.dispose();
+		}
 	}
 }
diff --git a/src/server/index.ts b/src/server/index.ts
index 88a39cd24..86dfd4b75 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -91,9 +91,9 @@ app.use(mount(require('./web')));
 function createServer() {
 	if (config.https) {
 		const certs: any = {};
-		Object.keys(config.https).forEach(k => {
+		for (const k of Object.keys(config.https)) {
 			certs[k] = fs.readFileSync(config.https[k]);
-		});
+		}
 		certs['allowHTTP1'] = true;
 		return http2.createSecureServer(certs, app.callback());
 	} else {
diff --git a/src/server/web/docs.ts b/src/server/web/docs.ts
index 9cc54cdf0..f9991fc65 100644
--- a/src/server/web/docs.ts
+++ b/src/server/web/docs.ts
@@ -36,7 +36,7 @@ async function genVars(lang: string): Promise<{ [key: string]: any }> {
 
 	const docs = glob.sync(`src/docs/**/*.${lang}.md`, { cwd });
 	vars['docs'] = {};
-	docs.forEach(x => {
+	for (const x of docs) {
 		const [, name] = x.match(/docs\/(.+?)\.(.+?)\.md$/);
 		if (vars['docs'][name] == null) {
 			vars['docs'][name] = {
@@ -45,7 +45,7 @@ async function genVars(lang: string): Promise<{ [key: string]: any }> {
 			};
 		}
 		vars['docs'][name]['title'][lang] = fs.readFileSync(cwd + x, 'utf-8').match(/^# (.+?)\r?\n/)[1];
-	});
+	}
 
 	vars['kebab'] = (string: string) => string.replace(/([a-z])([A-Z])/g, '$1-$2').replace(/\s+/g, '-').toLowerCase();
 
@@ -121,7 +121,7 @@ const sortParams = (params: Array<{ name: string }>) => {
 const extractParamDefRef = (params: Context[]) => {
 	let defs: any[] = [];
 
-	params.forEach(param => {
+	for (const param of params) {
 		if (param.data && param.data.ref) {
 			const props = (param as ObjectContext<any>).props;
 			defs.push({
@@ -133,7 +133,7 @@ const extractParamDefRef = (params: Context[]) => {
 
 			defs = defs.concat(childDefs);
 		}
-	});
+	}
 
 	return sortParams(defs);
 };
@@ -141,7 +141,7 @@ const extractParamDefRef = (params: Context[]) => {
 const extractPropDefRef = (props: any[]) => {
 	let defs: any[] = [];
 
-	Object.entries(props).forEach(([k, v]) => {
+	for (const [k, v] of Object.entries(props)) {
 		if (v.props) {
 			defs.push({
 				name: k,
@@ -152,7 +152,7 @@ const extractPropDefRef = (props: any[]) => {
 
 			defs = defs.concat(childDefs);
 		}
-	});
+	}
 
 	return sortParams(defs);
 };
diff --git a/src/services/following/requests/accept-all.ts b/src/services/following/requests/accept-all.ts
index 45da00498..cf1a9e923 100644
--- a/src/services/following/requests/accept-all.ts
+++ b/src/services/following/requests/accept-all.ts
@@ -11,10 +11,10 @@ export default async function(user: IUser) {
 		followeeId: user._id
 	});
 
-	requests.forEach(async request => {
+	for (const request of requests) {
 		const follower = await User.findOne({ _id: request.followerId });
 		accept(user, follower);
-	});
+	}
 
 	User.update({ _id: user._id }, {
 		$set: {
diff --git a/src/services/i/pin.ts b/src/services/i/pin.ts
index bcd5465c0..6a42982e6 100644
--- a/src/services/i/pin.ts
+++ b/src/services/i/pin.ts
@@ -101,9 +101,9 @@ export async function deliverPinnedChange(userId: mongo.ObjectID, noteId: mongo.
 
 	const item = `${config.url}/notes/${noteId}`;
 	const content = packAp(isAddition ? renderAdd(user, target, item) : renderRemove(user, target, item));
-	queue.forEach(inbox => {
+	for (const inbox of queue) {
 		deliver(user, content, inbox);
-	});
+	}
 }
 
 /**
diff --git a/src/services/i/update.ts b/src/services/i/update.ts
index 3d17c0796..242fbd3aa 100644
--- a/src/services/i/update.ts
+++ b/src/services/i/update.ts
@@ -30,9 +30,9 @@ export async function publishToFollowers(userId: mongo.ObjectID) {
 
 		if (queue.length > 0) {
 			const content = packAp(renderUpdate(await renderPerson(user), user));
-			queue.forEach(inbox => {
+			for (const inbox of queue) {
 				deliver(user, content, inbox);
-			});
+			}
 		}
 	}
 }
diff --git a/src/services/note/create.ts b/src/services/note/create.ts
index fd76af6b9..eef36505a 100644
--- a/src/services/note/create.ts
+++ b/src/services/note/create.ts
@@ -65,8 +65,8 @@ class NotificationManager {
 		}
 	}
 
-	public deliver() {
-		this.queue.forEach(async x => {
+	public async deliver() {
+		for (const x of this.queue) {
 			// ミュート情報を取得
 			const mentioneeMutes = await Mute.find({
 				muterId: x.target
@@ -80,7 +80,7 @@ class NotificationManager {
 					noteId: this.note._id
 				});
 			}
-		});
+		}
 	}
 }
 
@@ -175,11 +175,11 @@ export default async (user: IUser, data: Option, silent = false) => new Promise<
 	}
 
 	if (data.visibility == 'specified') {
-		data.visibleUsers.forEach(u => {
+		for (const u of data.visibleUsers) {
 			if (!mentionedUsers.some(x => x._id.equals(u._id))) {
 				mentionedUsers.push(u);
 			}
-		});
+		}
 	}
 
 	const note = await insertNote(user, data, tags, emojis, mentionedUsers);
@@ -213,13 +213,13 @@ export default async (user: IUser, data: Option, silent = false) => new Promise<
 
 	// ファイルが添付されていた場合ドライブのファイルの「このファイルが添付された投稿一覧」プロパティにこの投稿を追加
 	if (data.files) {
-		data.files.forEach(file => {
+		for (const file of data.files) {
 			DriveFile.update({ _id: file._id }, {
 				$push: {
 					'metadata.attachedNoteIds': note._id
 				}
 			});
-		});
+		}
 	}
 
 	// Increment notes count
@@ -230,13 +230,13 @@ export default async (user: IUser, data: Option, silent = false) => new Promise<
 
 	// 未読通知を作成
 	if (data.visibility == 'specified') {
-		data.visibleUsers.forEach(u => {
+		for (const u of data.visibleUsers) {
 			insertNoteUnread(u, note, true);
-		});
+		}
 	} else {
-		mentionedUsers.forEach(u => {
+		for (const u of mentionedUsers) {
 			insertNoteUnread(u, note, false);
-		});
+		}
 	}
 
 	if (data.reply) {
@@ -469,12 +469,12 @@ function extractHashtags(tokens: ReturnType<typeof parse>): string[] {
 	const hashtags: string[] = [];
 
 	const extract = (tokens: Node[]) => {
-		tokens.filter(x => x.name === 'hashtag').forEach(x => {
+		for (const x of tokens.filter(x => x.name === 'hashtag')) {
 			hashtags.push(x.props.hashtag);
-		});
-		tokens.filter(x => x.children).forEach(x => {
+		}
+		for (const x of tokens.filter(x => x.children)) {
 			extract(x.children);
-		});
+		}
 	};
 
 	// Extract hashtags
@@ -487,14 +487,14 @@ export function extractEmojis(tokens: ReturnType<typeof parse>): string[] {
 	const emojis: string[] = [];
 
 	const extract = (tokens: Node[]) => {
-		tokens.filter(x => x.name === 'emoji').forEach(x => {
+		for (const x of tokens.filter(x => x.name === 'emoji')) {
 			if (x.props.name && x.props.name.length <= 100) {
 				emojis.push(x.props.name);
 			}
-		});
-		tokens.filter(x => x.children).forEach(x => {
+		}
+		for (const x of tokens.filter(x => x.children)) {
 			extract(x.children);
-		});
+		}
 	};
 
 	// Extract emojis
@@ -526,9 +526,9 @@ async function notifyToWatchersOfRenotee(renote: INote, user: IUser, nm: Notific
 			}
 		});
 
-	watchers.forEach(watcher => {
+	for (const watcher of watchers) {
 		nm.push(watcher.userId, type);
-	});
+	}
 }
 
 async function notifyToWatchersOfReplyee(reply: INote, user: IUser, nm: NotificationManager) {
@@ -541,9 +541,9 @@ async function notifyToWatchersOfReplyee(reply: INote, user: IUser, nm: Notifica
 			}
 		});
 
-	watchers.forEach(watcher => {
+	for (const watcher of watchers) {
 		nm.push(watcher.userId, 'reply');
-	});
+	}
 }
 
 async function publishToUserLists(note: INote, noteObj: any) {
@@ -551,9 +551,9 @@ async function publishToUserLists(note: INote, noteObj: any) {
 		userIds: note.userId
 	});
 
-	lists.forEach(list => {
+	for (const list of lists) {
 		publishUserListStream(list._id, 'note', noteObj);
-	});
+	}
 }
 
 async function publishToFollowers(note: INote, user: IUser, noteActivity: any) {
@@ -594,19 +594,19 @@ async function publishToFollowers(note: INote, user: IUser, noteActivity: any) {
 		}
 	}
 
-	queue.forEach(inbox => {
+	for (const inbox of queue) {
 		deliver(user as any, noteActivity, inbox);
-	});
+	}
 }
 
 function deliverNoteToMentionedRemoteUsers(mentionedUsers: IUser[], user: ILocalUser, noteActivity: any) {
-	mentionedUsers.filter(u => isRemoteUser(u)).forEach(async (u) => {
+	for (const u of mentionedUsers.filter(u => isRemoteUser(u))) {
 		deliver(user, noteActivity, (u as IRemoteUser).inbox);
-	});
+	}
 }
 
-function createMentionedEvents(mentionedUsers: IUser[], note: INote, nm: NotificationManager) {
-	mentionedUsers.filter(u => isLocalUser(u)).forEach(async (u) => {
+async function createMentionedEvents(mentionedUsers: IUser[], note: INote, nm: NotificationManager) {
+	for (const u of mentionedUsers.filter(u => isLocalUser(u))) {
 		const detailPackedNote = await pack(note, u, {
 			detail: true
 		});
@@ -615,7 +615,7 @@ function createMentionedEvents(mentionedUsers: IUser[], note: INote, nm: Notific
 
 		// Create notification
 		nm.push(u._id, 'mention');
-	});
+	}
 }
 
 function saveQuote(renote: INote, note: INote) {
@@ -668,12 +668,12 @@ async function extractMentionedUsers(user: IUser, tokens: ReturnType<typeof pars
 	const mentions: any[] = [];
 
 	const extract = (tokens: Node[]) => {
-		tokens.filter(x => x.name === 'mention').forEach(x => {
+		for (const x of tokens.filter(x => x.name === 'mention')) {
 			mentions.push(x.props);
-		});
-		tokens.filter(x => x.children).forEach(x => {
+		}
+		for (const x of tokens.filter(x => x.children)) {
 			extract(x.children);
-		});
+		}
 	};
 
 	// Extract hashtags
diff --git a/src/services/note/delete.ts b/src/services/note/delete.ts
index 599525ac8..9709eeaf5 100644
--- a/src/services/note/delete.ts
+++ b/src/services/note/delete.ts
@@ -44,20 +44,20 @@ export default async function(user: IUser, note: INote) {
 	NoteUnread.find({
 		noteId: note._id
 	}).then(unreads => {
-		unreads.forEach(unread => {
+		for (const unread of unreads) {
 			read(unread.userId, unread.noteId);
-		});
+		}
 	});
 
 	// ファイルが添付されていた場合ドライブのファイルの「このファイルが添付された投稿一覧」プロパティからこの投稿を削除
 	if (note.fileIds) {
-		note.fileIds.forEach(fileId => {
+		for (const fileId of note.fileIds) {
 			DriveFile.update({ _id: fileId }, {
 				$pull: {
 					'metadata.attachedNoteIds': note._id
 				}
 			});
-		});
+		}
 	}
 
 	//#region ローカルの投稿なら削除アクティビティを配送
@@ -69,9 +69,9 @@ export default async function(user: IUser, note: INote) {
 			'_follower.host': { $ne: null }
 		});
 
-		followings.forEach(following => {
+		for (const following of followings) {
 			deliver(user, content, following._follower.inbox);
-		});
+		}
 	}
 	//#endregion
 
diff --git a/src/services/note/reaction/create.ts b/src/services/note/reaction/create.ts
index 4a09cf535..4f56f399a 100644
--- a/src/services/note/reaction/create.ts
+++ b/src/services/note/reaction/create.ts
@@ -70,12 +70,12 @@ export default async (user: IUser, note: INote, reaction: string) => new Promise
 			}
 		})
 		.then(watchers => {
-			watchers.forEach(watcher => {
+			for (const watcher of watchers) {
 				notify(watcher.userId, user._id, 'reaction', {
 					noteId: note._id,
 					reaction: reaction
 				});
-			});
+			}
 		});
 
 	// ユーザーがローカルユーザーかつ自動ウォッチ設定がオンならばこの投稿をWatchする
diff --git a/tslint.json b/tslint.json
index 1adc0a2ae..6c9af508b 100644
--- a/tslint.json
+++ b/tslint.json
@@ -31,6 +31,10 @@
 		"member-ordering": [false],
 		"ban-types": [
 			"Object"
+		],
+		"ban": [
+			true,
+			{"name": ["*", "forEach"], "message": "Use for-of loop instead."}
 		]
 	},
 	"rulesDirectory": []