diff --git a/src/ai.ts b/src/ai.ts
index d9bc9a1..adc1043 100644
--- a/src/ai.ts
+++ b/src/ai.ts
@@ -502,6 +502,7 @@ export default class 藍 {
 		const rec = this.getMeta();
 
 		for (const [k, v] of Object.entries(meta)) {
+			// @ts-ignore
 			rec[k] = v;
 		}
 
diff --git a/src/modules/chart/index.ts b/src/modules/chart/index.ts
index ead3721..daecaf1 100644
--- a/src/modules/chart/index.ts
+++ b/src/modules/chart/index.ts
@@ -5,6 +5,7 @@ import Message from '@/message';
 import { renderChart } from './render-chart';
 import { items } from '@/vocabulary';
 import config from '@/config';
+type chartType = 'userNotes'| 'notes' | 'followers' | 'random';
 
 export default class extends Module {
 	public readonly name = 'chart';
@@ -42,7 +43,7 @@ export default class extends Module {
 	}
 
 	@autobind
-	private async genChart(type, params?): Promise<any> {
+	private async genChart(type: chartType, params?: any): Promise<any> {
 		this.log('Chart data fetching...');
 
 		let chart;
@@ -142,7 +143,7 @@ export default class extends Module {
 			this.log('Chart requested');
 		}
 
-		let type = 'random';
+		let type: chartType = 'random';
 		if (msg.includes(['フォロワー'])) type = 'followers';
 		if (msg.includes(['投稿'])) type = 'userNotes';
 
diff --git a/src/modules/color/index.ts b/src/modules/color/index.ts
index 3cd0f2b..67dc85c 100644
--- a/src/modules/color/index.ts
+++ b/src/modules/color/index.ts
@@ -38,7 +38,7 @@ export default class extends Module {
 	}
 
 	@autobind
-	private async getColorSampleFile(r,g,b): Promise<any> {
+	private async getColorSampleFile(r: number,g: number,b: number): Promise<any> {
 		const colorSample = generateColorSample(r,g,b);
 
 		this.log('Image uploading...');
diff --git a/src/modules/color/render.ts b/src/modules/color/render.ts
index e4449d0..77fb482 100644
--- a/src/modules/color/render.ts
+++ b/src/modules/color/render.ts
@@ -2,7 +2,7 @@ import { createCanvas } from 'canvas';
 
 const imageSize = 1; //px
 
-export function generateColorSample(r: string, g: string, b: string) {
+export function generateColorSample(r: number, g: number, b: number): Buffer {
     const canvas = createCanvas(imageSize, imageSize);
     const ctx = canvas.getContext('2d');
     ctx.antialias = 'none';
@@ -14,4 +14,4 @@ export function generateColorSample(r: string, g: string, b: string) {
 
     // canvas.toBuffer()をreturn
     return canvas.toBuffer();
-}
\ No newline at end of file
+}
diff --git a/src/modules/keyword/index.ts b/src/modules/keyword/index.ts
index 7eeac02..56991fa 100644
--- a/src/modules/keyword/index.ts
+++ b/src/modules/keyword/index.ts
@@ -4,6 +4,7 @@ import Module from '@/module';
 import config from '@/config';
 import serifs from '@/serifs';
 import { mecab } from './mecab';
+import { Note } from '@/misskey/note';
 
 function kanaToHira(str: string) {
 	return str.replace(/[\u30a1-\u30f6]/g, match => {
@@ -39,7 +40,7 @@ export default class extends Module {
 			limit: 30
 		});
 
-		const interestedNotes = tl.filter(note =>
+		const interestedNotes = tl.filter((note: Note) =>
 			note.userId !== this.ai.account.id &&
 			note.text != null &&
 			note.cw == null);
diff --git a/src/modules/maze/gen-maze.ts b/src/modules/maze/gen-maze.ts
index a14e4ee..98a8796 100644
--- a/src/modules/maze/gen-maze.ts
+++ b/src/modules/maze/gen-maze.ts
@@ -1,5 +1,6 @@
 import * as gen from 'random-seed';
 import { CellType } from './maze';
+import {mazeSize} from './index'
 
 const cellVariants = {
 	void: {
@@ -77,20 +78,23 @@ const cellVariants = {
 
 type Dir = 'left' | 'right' | 'top' | 'bottom';
 
-export function genMaze(seed, complexity?) {
+export function genMaze(seed: string, complexity: mazeSize): CellType[][] {
 	const rand = gen.create(seed);
 
-	let mazeSize;
-	if (complexity) {
-		if (complexity === 'veryEasy') mazeSize = 3 + rand(3);
-		if (complexity === 'easy') mazeSize = 8 + rand(8);
-		if (complexity === 'hard') mazeSize = 22 + rand(13);
-		if (complexity === 'veryHard') mazeSize = 40 + rand(20);
-		if (complexity === 'ai') mazeSize = 100;
-	} else {
-		mazeSize = 11 + rand(21);
+	function decisionSize(complexity: mazeSize): number {
+		if (complexity) {
+			if (complexity === 'veryEasy') return 3 + rand(3);
+			if (complexity === 'easy') return 8 + rand(8);
+			if (complexity === 'hard') return 22 + rand(13);
+			if (complexity === 'veryHard') return 40 + rand(20);
+			if (complexity === 'ai') return 100;
+		}
+		return 11 + rand(21);
 	}
 
+	let mazeSize: number = decisionSize(complexity);
+
+
 	const donut = rand(3) === 0;
 	const donutWidth = 1 + Math.floor(mazeSize / 8) + rand(Math.floor(mazeSize / 4));
 
diff --git a/src/modules/maze/index.ts b/src/modules/maze/index.ts
index 8311e94..5c64585 100644
--- a/src/modules/maze/index.ts
+++ b/src/modules/maze/index.ts
@@ -5,6 +5,8 @@ import { genMaze } from './gen-maze';
 import { renderMaze } from './render-maze';
 import Message from '@/message';
 
+export type mazeSize = 'veryEasy' | 'easy' | 'hard' | 'veryHard' | 'ai' | undefined;
+
 export default class extends Module {
 	public readonly name = 'maze';
 
@@ -39,7 +41,7 @@ export default class extends Module {
 	}
 
 	@autobind
-	private async genMazeFile(seed, size?): Promise<any> {
+	private async genMazeFile(seed: string, size?: mazeSize): Promise<any> {
 		this.log('Maze generating...');
 		const maze = genMaze(seed, size);
 
@@ -58,7 +60,7 @@ export default class extends Module {
 	@autobind
 	private async mentionHook(msg: Message) {
 		if (msg.includes(['迷路'])) {
-			let size: string | null = null;
+			let size: mazeSize = void 0;
 			if (msg.includes(['接待'])) size = 'veryEasy';
 			if (msg.includes(['簡単', 'かんたん', '易しい', 'やさしい', '小さい', 'ちいさい'])) size = 'easy';
 			if (msg.includes(['難しい', 'むずかしい', '複雑な', '大きい', 'おおきい'])) size = 'hard';
@@ -66,7 +68,7 @@ export default class extends Module {
 			if (msg.includes(['藍']) && msg.includes(['本気'])) size = 'ai';
 			this.log('Maze requested');
 			setTimeout(async () => {
-				const file = await this.genMazeFile(Date.now(), size);
+				const file = await this.genMazeFile(Date.now().toString(), size);
 				this.log('Replying...');
 				msg.reply(serifs.maze.foryou, { file });
 			}, 3000);
diff --git a/src/modules/maze/render-maze.ts b/src/modules/maze/render-maze.ts
index 6f4f5da..4ea8795 100644
--- a/src/modules/maze/render-maze.ts
+++ b/src/modules/maze/render-maze.ts
@@ -1,5 +1,5 @@
 import * as gen from 'random-seed';
-import { createCanvas } from 'canvas';
+import { createCanvas, NodeCanvasRenderingContext2D } from 'canvas';
 
 import { CellType } from './maze';
 import { themes } from './themes';
@@ -8,7 +8,7 @@ const imageSize = 4096; // px
 const margin = 96 * 4;
 const mazeAreaSize = imageSize - (margin * 2);
 
-export function renderMaze(seed, maze: CellType[][]) {
+export function renderMaze(seed: string, maze: CellType[][]) {
 	const rand = gen.create(seed);
 	const mazeSize = maze.length;
 
@@ -27,7 +27,7 @@ export function renderMaze(seed, maze: CellType[][]) {
 	ctx.fillRect(margin / 2, margin / 2, imageSize - ((margin / 2) * 2), imageSize - ((margin / 2) * 2));
 
 	// Draw
-	function drawCell(ctx, x, y, size, left, right, top, bottom, mark) {
+	function drawCell(ctx: NodeCanvasRenderingContext2D, x: number, y: number, size: number, left: boolean, right: boolean, top: boolean, bottom: boolean, mark: boolean) {
 		const wallThickness = size / 6;
 		const margin = size / 6;
 		const markerMargin = size / 3;
@@ -60,7 +60,7 @@ export function renderMaze(seed, maze: CellType[][]) {
 		ctx.lineWidth = wallThickness;
 		ctx.lineCap = 'square';
 
-		function line(ax, ay, bx, by) {
+		function line(ax: number, ay: number, bx: number, by: number) {
 			ctx.beginPath();
 			ctx.lineTo(x + ax, y + ay);
 			ctx.lineTo(x + bx, y + by);
diff --git a/src/modules/menu/index.ts b/src/modules/menu/index.ts
index fc7dd62..d6d7554 100644
--- a/src/modules/menu/index.ts
+++ b/src/modules/menu/index.ts
@@ -14,7 +14,7 @@ export default class extends Module {
     }
 
     @autobind
-    private async mentionHook(msg: Message) {
+    private async mentionHook(msg: Message): Promise<boolean> {
         if (msg.text && msg.text.includes('ごはん')) {
             // 1~2535111の適当な数字を取得
             const random_number = Math.floor(Math.random() * 2535111) + 1;
@@ -35,8 +35,7 @@ export default class extends Module {
                 });
                 return true;
             }
-        } else {
-            return false;
         }
+        return false;
     }
 }
diff --git a/src/modules/reversi/back.ts b/src/modules/reversi/back.ts
index b7b9d3d..671d8b8 100644
--- a/src/modules/reversi/back.ts
+++ b/src/modules/reversi/back.ts
@@ -14,7 +14,7 @@ import config from '@/config';
 import serifs from '@/serifs';
 import { User } from '@/misskey/user';
 
-function getUserName(user) {
+function getUserName(user: User) {
 	return user.name || user.username;
 }
 
@@ -45,7 +45,7 @@ class Session {
 	/**
 	 * 最大のターン数
 	 */
-	private maxTurn;
+	private maxTurn: number;
 
 	/**
 	 * 現在のターン数
@@ -137,7 +137,7 @@ class Session {
 			if (pix == 'null') return;
 
 			const [x, y] = this.o.transformPosToXy(i);
-			const get = (x, y) => {
+			const get = (x: number, y: number) => {
 				if (x < 0 || y < 0 || x >= this.o.mapWidth || y >= this.o.mapHeight) return 'null';
 				return this.o.mapDataGet(this.o.transformXyToPos(x, y));
 			};