diff --git a/.eslintrc.js b/.eslintrc.js
index acce3a24..fc979176 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -40,19 +40,8 @@ module.exports = defineConfig({
         },
       },
     ],
-    'node/no-missing-import': [
-      'error',
-      {
-        allowModules: ['types', 'estree', 'testUtils', 'less', 'sass', 'stylus'],
-        tryExtensions: ['.ts', '.js', '.jsx', '.tsx', '.d.ts'],
-      },
-    ],
-    'node/no-missing-require': [
-      'error',
-      {
-        tryExtensions: ['.ts', '.js', '.jsx', '.tsx', '.d.ts'],
-      },
-    ],
+    'node/no-missing-import': 'off',
+    'node/no-missing-require': 'off',
     'node/no-deprecated-api': 'off',
     'node/no-unpublished-import': 'off',
     'node/no-unpublished-require': 'off',
diff --git a/.npmignore b/.npmignore
index ee1b8e5e..d560a8fc 100644
--- a/.npmignore
+++ b/.npmignore
@@ -2,5 +2,7 @@ examples
 benchmark
 .github
 tsconfig.json
+tsconfig.build.json
 src
-docs
\ No newline at end of file
+docs
+yarn.lock
\ No newline at end of file
diff --git a/CODE_OF_CONDUCT.md b/docs/CODE_OF_CONDUCT.md
similarity index 100%
rename from CODE_OF_CONDUCT.md
rename to docs/CODE_OF_CONDUCT.md
diff --git a/jest.config.js b/jest.config.js
index efc38fab..c30d843d 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -3,6 +3,10 @@ module.exports = {
   transform: {
     '^.+\\.(ts|tsx)$': 'ts-jest',
   },
+  modulePaths: ['<rootDir>/src'],
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/src/$1',
+  },
   testPathIgnorePatterns: ['./examples'],
   testEnvironment: 'miniflare',
   testEnvironmentOptions: {
diff --git a/package.json b/package.json
index 676a3418..0ee3a743 100644
--- a/package.json
+++ b/package.json
@@ -10,63 +10,61 @@
   "scripts": {
     "test": "jest",
     "lint": "eslint --ext js,ts src .eslintrc.js && prettier --check src",
-    "build": "rimraf dist && tsc",
-    "watch": "tsc -w",
+    "build": "rimraf dist && tsc --project tsconfig.build.json && tsc-alias -p tsconfig.build.json",
+    "watch": "tsc -w --project tsconfig.build.json & tsc-alias -w -p tsconfig.build.json",
     "prepublishOnly": "yarn build"
   },
   "exports": {
     ".": "./dist/index.js",
-    "./basic-auth": "./dist/middleware/basic-auth/basic-auth.js",
-    "./body-parse": "./dist/middleware/body-parse/body-parse.js",
-    "./cookie": "./dist/middleware/cookie/cookie.js",
-    "./cors": "./dist/middleware/cors/cors.js",
-    "./etag": "./dist/middleware/etag/etag.js",
-    "./graphql-server": "./dist/middleware/graphql-server/graphql-server.js",
-    "./logger": "./dist/middleware/logger/logger.js",
-    "./mustache": "./dist/middleware/mustache/mustache.js",
-    "./powered-by": "./dist/middleware/powered-by/powered-by.js",
-    "./pretty-json": "./dist/middleware/pretty-json/pretty-json.js",
-    "./serve-static": "./dist/middleware/serve-static/serve-static.js",
-    "./router/trie-router": "./dist/router/trie-router/router.js",
-    "./router/reg-exp-router": "./dist/router/reg-exp-router/index.js",
-    "./utils/cloudflare": "./dist/utils/cloudflare.js",
-    "./utils/crypto": "./dist/utils/crypto.js",
-    "./utils/mime": "./dist/utils/mime.js"
+    "./basic-auth": "./dist/middleware/basic-auth",
+    "./body-parse": "./dist/middleware/body-parse",
+    "./cookie": "./dist/middleware/cookie",
+    "./cors": "./dist/middleware/cors",
+    "./etag": "./dist/middleware/etag",
+    "./graphql-server": "./dist/middleware/graphql-server",
+    "./logger": "./dist/middleware/logger",
+    "./mustache": "./dist/middleware/mustache",
+    "./powered-by": "./dist/middleware/powered-by",
+    "./pretty-json": "./dist/middleware/pretty-json",
+    "./serve-static": "./dist/middleware/serve-static",
+    "./router/trie-router": "./dist/router/trie-router",
+    "./router/reg-exp-router": "./dist/router/reg-exp-router",
+    "./utils/*": "./dist/utils/*.js"
   },
   "typesVersions": {
     "*": {
       "basic-auth": [
-        "./dist/middleware/basic-auth/basic-auth.d.ts"
+        "./dist/middleware/basic-auth"
       ],
       "body-parse": [
-        "./dist/middleware/body-parse/body-parse.d.ts"
+        "./dist/middleware/body-parse"
       ],
       "cookie": [
-        "./dist/middleware/cookie/cookie.d.ts"
+        "./dist/middleware/cookie"
       ],
       "cors": [
-        "./dist/middleware/cors/cors.d.ts"
+        "./dist/middleware/cors"
       ],
       "etag": [
-        "./dist/middleware/etag/etag.d.ts"
+        "./dist/middleware/etag"
       ],
       "graphql-server": [
-        "./dist/middleware/graphql-server/graphql-server.d.ts"
+        "./dist/middleware/graphql-server"
       ],
       "logger": [
-        "./dist/middleware/logger/logger.d.ts"
+        "./dist/middleware/logger"
       ],
       "mustache": [
-        "./dist/middleware/mustache/mustache.d.ts"
+        "./dist/middleware/mustache"
       ],
       "powered-by": [
-        "./dist/middleware/powered-by/powered-by.d.ts"
+        "./dist/middleware/powered-by"
       ],
       "pretty-json": [
-        "./dist/middleware/pretty-json/pretty-json.d.ts"
+        "./dist/middleware/pretty-json"
       ],
       "serve-static": [
-        "./dist/middleware/serve-static/serve-static.d.ts"
+        "./dist/middleware/serve-static"
       ],
       "router/trie-router": [
         "./dist/router/trie-router/router.d.ts"
@@ -74,14 +72,8 @@
       "router/reg-exp-router": [
         "./dist/router/reg-exp-router/router.d.ts"
       ],
-      "utils/cloudflare": [
-        "./dist/utils/cloudflare.d.ts"
-      ],
-      "utils/crypto": [
-        "./dist/utils/crypto.d.ts"
-      ],
-      "utils/mime": [
-        "./dist/utils/mime.d.ts"
+      "utils/*": [
+        "./dist/utils/*"
       ]
     }
   },
@@ -130,6 +122,7 @@
     "prettier-plugin-md-nocjsp": "^1.2.0",
     "rimraf": "^3.0.2",
     "ts-jest": "^27.1.2",
+    "tsc-alias": "^1.6.6",
     "typescript": "^4.5.5"
   },
   "engines": {
diff --git a/src/compose.test.ts b/src/compose.test.ts
index c2476cef..56c11df0 100644
--- a/src/compose.test.ts
+++ b/src/compose.test.ts
@@ -1,5 +1,5 @@
-import { compose } from './compose'
-import { Context } from './context'
+import { compose } from '@/compose'
+import { Context } from '@/context'
 
 type C = {
   req: Record<string, string>
diff --git a/src/compose.ts b/src/compose.ts
index 81f9a884..14f211f1 100644
--- a/src/compose.ts
+++ b/src/compose.ts
@@ -1,5 +1,5 @@
-import { Context } from './context'
-import type { ErrorHandler } from './hono'
+import { Context } from '@/context'
+import type { ErrorHandler } from '@/hono'
 
 // Based on the code in the MIT licensed `koa-compose` package.
 export const compose = <C>(middleware: Function[], onError?: ErrorHandler) => {
diff --git a/src/context.test.ts b/src/context.test.ts
index 99b6fc73..6daad6b2 100644
--- a/src/context.test.ts
+++ b/src/context.test.ts
@@ -1,4 +1,4 @@
-import { Context } from './context'
+import { Context } from '@/context'
 
 describe('Context', () => {
   const req = new Request('http://localhost/')
diff --git a/src/context.ts b/src/context.ts
index bcd824bc..12117149 100644
--- a/src/context.ts
+++ b/src/context.ts
@@ -1,5 +1,5 @@
-import { isAbsoluteURL } from './utils/url'
-import { getStatusText } from './utils/http-status'
+import { isAbsoluteURL } from '@/utils/url'
+import { getStatusText } from '@/utils/http-status'
 
 type Headers = Record<string, string>
 type Data = string | ArrayBuffer | ReadableStream
diff --git a/src/hono.test.ts b/src/hono.test.ts
index 6177b4da..eacaf32a 100644
--- a/src/hono.test.ts
+++ b/src/hono.test.ts
@@ -1,4 +1,4 @@
-import { Hono } from './hono'
+import { Hono } from '@/hono'
 
 describe('GET Request', () => {
   const app = new Hono()
diff --git a/src/hono.ts b/src/hono.ts
index 3b17cfbb..26b7f7b2 100644
--- a/src/hono.ts
+++ b/src/hono.ts
@@ -1,10 +1,10 @@
-import { compose } from './compose'
-import { getPathFromURL, mergePath } from './utils/url'
-import { Context } from './context'
-import type { Env } from './context'
-import type { Result, Router } from './router'
-import { METHOD_NAME_OF_ALL } from './router'
-import { TrieRouter } from './router/trie-router' // Default Router
+import { compose } from '@/compose'
+import { getPathFromURL, mergePath } from '@/utils/url'
+import { Context } from '@/context'
+import { METHOD_NAME_OF_ALL } from '@/router'
+import { TrieRouter } from '@/router/trie-router' // Default Router
+import type { Env } from '@/context'
+import type { Result, Router } from '@/router'
 
 declare global {
   interface Request<ParamKeyType = string> {
diff --git a/src/index.ts b/src/index.ts
index 311e6bd7..bb1fdba3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export { Hono } from './hono'
-export type { Handler, MiddlewareHandler } from './hono'
-export { Context } from './context'
-export type { Env } from './context'
+export { Hono } from '@/hono'
+export type { Handler, MiddlewareHandler } from '@/hono'
+export { Context } from '@/context'
+export type { Env } from '@/context'
diff --git a/src/middleware/basic-auth/basic-auth.test.ts b/src/middleware/basic-auth/index.test.ts
similarity index 97%
rename from src/middleware/basic-auth/basic-auth.test.ts
rename to src/middleware/basic-auth/index.test.ts
index 1c0c8e08..3d20583b 100644
--- a/src/middleware/basic-auth/basic-auth.test.ts
+++ b/src/middleware/basic-auth/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { basicAuth } from './basic-auth'
+import { Hono } from '@/hono'
+import { basicAuth } from '@/middleware/basic-auth'
 import { SHA256 } from 'crypto-js'
 
 describe('Basic Auth by Middleware', () => {
diff --git a/src/middleware/basic-auth/basic-auth.ts b/src/middleware/basic-auth/index.ts
similarity index 93%
rename from src/middleware/basic-auth/basic-auth.ts
rename to src/middleware/basic-auth/index.ts
index 1f5b935d..a7e4c1d1 100644
--- a/src/middleware/basic-auth/basic-auth.ts
+++ b/src/middleware/basic-auth/index.ts
@@ -1,6 +1,6 @@
-import type { Context } from '../../context'
-import { timingSafeEqual } from '../../utils/buffer'
-import { decodeBase64 } from '../../utils/crypto'
+import type { Context } from '@/context'
+import { timingSafeEqual } from '@/utils/buffer'
+import { decodeBase64 } from '@/utils/crypto'
 
 const CREDENTIALS_REGEXP = /^ *(?:[Bb][Aa][Ss][Ii][Cc]) +([A-Za-z0-9._~+/-]+=*) *$/
 const USER_PASS_REGEXP = /^([^:]*):(.*)$/
diff --git a/src/middleware/body-parse/body-parse.test.ts b/src/middleware/body-parse/index.test.ts
similarity index 95%
rename from src/middleware/body-parse/body-parse.test.ts
rename to src/middleware/body-parse/index.test.ts
index 941f449d..cbd4b2ce 100644
--- a/src/middleware/body-parse/body-parse.test.ts
+++ b/src/middleware/body-parse/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { bodyParse } from './body-parse'
+import { Hono } from '@/hono'
+import { bodyParse } from '@/middleware/body-parse'
 
 describe('Parse Body Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/body-parse/body-parse.ts b/src/middleware/body-parse/index.ts
similarity index 100%
rename from src/middleware/body-parse/body-parse.ts
rename to src/middleware/body-parse/index.ts
diff --git a/src/middleware/cookie/cookie.test.ts b/src/middleware/cookie/index.test.ts
similarity index 96%
rename from src/middleware/cookie/cookie.test.ts
rename to src/middleware/cookie/index.test.ts
index e3b3e805..23a3a396 100644
--- a/src/middleware/cookie/cookie.test.ts
+++ b/src/middleware/cookie/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { cookie } from './cookie'
+import { Hono } from '@/hono'
+import { cookie } from '@/middleware/cookie'
 
 describe('Cookie Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/cookie/cookie.ts b/src/middleware/cookie/index.ts
similarity index 95%
rename from src/middleware/cookie/cookie.ts
rename to src/middleware/cookie/index.ts
index 100f10ae..d3b92546 100644
--- a/src/middleware/cookie/cookie.ts
+++ b/src/middleware/cookie/index.ts
@@ -1,4 +1,4 @@
-import type { Context } from '../../context'
+import type { Context } from '@/context'
 
 declare global {
   interface Request {
@@ -6,7 +6,7 @@ declare global {
   }
 }
 
-declare module '../../context' {
+declare module '@/context' {
   interface Context {
     cookie: (name: string, value: string, options?: CookieOptions) => void
   }
diff --git a/src/middleware/cors/cors.test.ts b/src/middleware/cors/index.test.ts
similarity index 96%
rename from src/middleware/cors/cors.test.ts
rename to src/middleware/cors/index.test.ts
index ae6e52df..50e4695e 100644
--- a/src/middleware/cors/cors.test.ts
+++ b/src/middleware/cors/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { cors } from './cors'
+import { Hono } from '@/hono'
+import { cors } from '@/middleware/cors'
 
 describe('CORS by Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/cors/cors.ts b/src/middleware/cors/index.ts
similarity index 100%
rename from src/middleware/cors/cors.ts
rename to src/middleware/cors/index.ts
diff --git a/src/middleware/etag/etag.test.ts b/src/middleware/etag/index.test.ts
similarity index 95%
rename from src/middleware/etag/etag.test.ts
rename to src/middleware/etag/index.test.ts
index 8f263c2a..b4921a89 100644
--- a/src/middleware/etag/etag.test.ts
+++ b/src/middleware/etag/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { etag } from './etag'
+import { Hono } from '@/hono'
+import { etag } from '@/middleware/etag'
 
 describe('Etag Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/etag/etag.ts b/src/middleware/etag/index.ts
similarity index 85%
rename from src/middleware/etag/etag.ts
rename to src/middleware/etag/index.ts
index f173102f..46982a50 100644
--- a/src/middleware/etag/etag.ts
+++ b/src/middleware/etag/index.ts
@@ -1,6 +1,6 @@
-import { sha1 } from '../../utils/crypto'
-import { parseBody } from '../../utils/body'
-import type { Context } from '../../context'
+import { sha1 } from '@/utils/crypto'
+import { parseBody } from '@/utils/body'
+import type { Context } from '@/context'
 
 type ETagOptions = {
   weak: boolean
diff --git a/src/middleware/graphql-server/graphql-server.test.ts b/src/middleware/graphql-server/index.test.ts
similarity index 99%
rename from src/middleware/graphql-server/graphql-server.test.ts
rename to src/middleware/graphql-server/index.test.ts
index dd10c519..af756ede 100644
--- a/src/middleware/graphql-server/graphql-server.test.ts
+++ b/src/middleware/graphql-server/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { errorMessages, graphqlServer } from './graphql-server'
+import { Hono } from '@/hono'
+import { errorMessages, graphqlServer } from '@/middleware/graphql-server'
 import {
   buildSchema,
   GraphQLSchema,
diff --git a/src/middleware/graphql-server/graphql-server.ts b/src/middleware/graphql-server/index.ts
similarity index 98%
rename from src/middleware/graphql-server/graphql-server.ts
rename to src/middleware/graphql-server/index.ts
index cf3e8c5b..6a235b66 100644
--- a/src/middleware/graphql-server/graphql-server.ts
+++ b/src/middleware/graphql-server/index.ts
@@ -1,8 +1,8 @@
 // Based on the code in the `express-graphql` package.
 // https://github.com/graphql/express-graphql/blob/main/src/index.ts
 
-import { parseBody } from './parse-body'
-import type { Context } from '../../context'
+import { parseBody } from '@/middleware/graphql-server/parse-body'
+import type { Context } from '@/context'
 
 import {
   Source,
diff --git a/src/middleware/graphql-server/parse-body.test.ts b/src/middleware/graphql-server/parse-body.test.ts
index a16c8671..114a29ca 100644
--- a/src/middleware/graphql-server/parse-body.test.ts
+++ b/src/middleware/graphql-server/parse-body.test.ts
@@ -1,4 +1,4 @@
-import { parseBody } from './parse-body'
+import { parseBody } from '@/middleware/graphql-server/parse-body'
 
 describe('parseBody', () => {
   it('Should return a blank JSON object', async () => {
diff --git a/src/middleware/logger/logger.test.ts b/src/middleware/logger/index.test.ts
similarity index 96%
rename from src/middleware/logger/logger.test.ts
rename to src/middleware/logger/index.test.ts
index 2e4c0b80..09aa446b 100644
--- a/src/middleware/logger/logger.test.ts
+++ b/src/middleware/logger/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { logger } from './logger'
+import { Hono } from '@/hono'
+import { logger } from '@/middleware/logger'
 
 describe('Logger by Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/logger/logger.ts b/src/middleware/logger/index.ts
similarity index 95%
rename from src/middleware/logger/logger.ts
rename to src/middleware/logger/index.ts
index bc094952..717b2551 100644
--- a/src/middleware/logger/logger.ts
+++ b/src/middleware/logger/index.ts
@@ -1,5 +1,5 @@
-import { getPathFromURL } from '../../utils/url'
-import type { Context } from '../../context'
+import { getPathFromURL } from '@/utils/url'
+import type { Context } from '@/context'
 
 const humanize = (n: string[], opts?: { delimiter?: string; separator?: string }) => {
   const options = opts || {}
diff --git a/src/middleware/mustache/mustache.test.ts b/src/middleware/mustache/index.test.ts
similarity index 95%
rename from src/middleware/mustache/mustache.test.ts
rename to src/middleware/mustache/index.test.ts
index ac96b8cb..d6cd1fc1 100644
--- a/src/middleware/mustache/mustache.test.ts
+++ b/src/middleware/mustache/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { mustache } from './mustache'
+import { Hono } from '@/hono'
+import { mustache } from '@/middleware/mustache'
 
 // Mock
 const store: { [key: string]: string } = {
diff --git a/src/middleware/mustache/mustache.ts b/src/middleware/mustache/index.ts
similarity index 97%
rename from src/middleware/mustache/mustache.ts
rename to src/middleware/mustache/index.ts
index 03dec1da..76761985 100644
--- a/src/middleware/mustache/mustache.ts
+++ b/src/middleware/mustache/index.ts
@@ -1,4 +1,4 @@
-import type { Context } from '../../context'
+import type { Context } from '@/context'
 import { getContentFromKVAsset, getKVFilePath } from '../../utils/cloudflare'
 
 const EXTENSION = '.mustache'
diff --git a/src/middleware/powered-by/powered-by.test.ts b/src/middleware/powered-by/index.test.ts
similarity index 83%
rename from src/middleware/powered-by/powered-by.test.ts
rename to src/middleware/powered-by/index.test.ts
index 0866786a..29529ae6 100644
--- a/src/middleware/powered-by/powered-by.test.ts
+++ b/src/middleware/powered-by/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { poweredBy } from './powered-by'
+import { Hono } from '@/hono'
+import { poweredBy } from '@/middleware/powered-by'
 
 describe('Powered by Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/powered-by/powered-by.ts b/src/middleware/powered-by/index.ts
similarity index 60%
rename from src/middleware/powered-by/powered-by.ts
rename to src/middleware/powered-by/index.ts
index ad36aa1d..e4ed8272 100644
--- a/src/middleware/powered-by/powered-by.ts
+++ b/src/middleware/powered-by/index.ts
@@ -1,9 +1,8 @@
-import type { Context } from '../../context'
+import type { Context } from '@/context'
 
 export const poweredBy = () => {
   return async (c: Context, next: Function) => {
     await next()
-    // await c.res.headers.append('X-Powered-By', 'Hono')
     c.res.headers.append('X-Powered-By', 'Hono')
   }
 }
diff --git a/src/middleware/pretty-json/pretty-json.test.ts b/src/middleware/pretty-json/index.test.ts
similarity index 90%
rename from src/middleware/pretty-json/pretty-json.test.ts
rename to src/middleware/pretty-json/index.test.ts
index c7453c7e..1f279a91 100644
--- a/src/middleware/pretty-json/pretty-json.test.ts
+++ b/src/middleware/pretty-json/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { prettyJSON } from './pretty-json'
+import { Hono } from '@/hono'
+import { prettyJSON } from '@/middleware/pretty-json'
 
 describe('JSON pretty by Middleware', () => {
   const app = new Hono()
diff --git a/src/middleware/pretty-json/pretty-json.ts b/src/middleware/pretty-json/index.ts
similarity index 87%
rename from src/middleware/pretty-json/pretty-json.ts
rename to src/middleware/pretty-json/index.ts
index 54392bfa..ece3535f 100644
--- a/src/middleware/pretty-json/pretty-json.ts
+++ b/src/middleware/pretty-json/index.ts
@@ -1,4 +1,4 @@
-import type { Context } from '../../context'
+import type { Context } from '@/context'
 
 type prettyOptions = {
   space: number
diff --git a/src/middleware/serve-static/serve-static.test.ts b/src/middleware/serve-static/index.test.ts
similarity index 96%
rename from src/middleware/serve-static/serve-static.test.ts
rename to src/middleware/serve-static/index.test.ts
index 4a4492a4..6ad3c441 100644
--- a/src/middleware/serve-static/serve-static.test.ts
+++ b/src/middleware/serve-static/index.test.ts
@@ -1,5 +1,5 @@
-import { Hono } from '../../hono'
-import { serveStatic } from './serve-static'
+import { Hono } from '@/hono'
+import { serveStatic } from '@/middleware/serve-static'
 
 // Mock
 const store: { [key: string]: string } = {
diff --git a/src/middleware/serve-static/serve-static.ts b/src/middleware/serve-static/index.ts
similarity index 81%
rename from src/middleware/serve-static/serve-static.ts
rename to src/middleware/serve-static/index.ts
index 927a685d..c1d1c88b 100644
--- a/src/middleware/serve-static/serve-static.ts
+++ b/src/middleware/serve-static/index.ts
@@ -1,6 +1,6 @@
-import type { Context } from '../../context'
-import { getContentFromKVAsset, getKVFilePath } from '../../utils/cloudflare'
-import { getMimeType } from '../../utils/mime'
+import type { Context } from '@/context'
+import { getContentFromKVAsset, getKVFilePath } from '@/utils/cloudflare'
+import { getMimeType } from '@/utils/mime'
 
 type Options = {
   root: string
diff --git a/src/router/reg-exp-router/index.ts b/src/router/reg-exp-router/index.ts
index 45931b15..534400e6 100644
--- a/src/router/reg-exp-router/index.ts
+++ b/src/router/reg-exp-router/index.ts
@@ -1 +1 @@
-export { RegExpRouter } from './router'
+export { RegExpRouter } from '@/router/reg-exp-router/router'
diff --git a/src/router/reg-exp-router/router.test.ts b/src/router/reg-exp-router/router.test.ts
index c5763477..3eafd289 100644
--- a/src/router/reg-exp-router/router.test.ts
+++ b/src/router/reg-exp-router/router.test.ts
@@ -1,5 +1,5 @@
-import { RegExpRouter } from './router'
-import { METHOD_NAME_OF_ALL } from '../../router'
+import { RegExpRouter } from '@/router/reg-exp-router/router'
+import { METHOD_NAME_OF_ALL } from '@/router'
 
 describe('Basic Usage', () => {
   const router = new RegExpRouter<string>()
diff --git a/src/router/reg-exp-router/router.ts b/src/router/reg-exp-router/router.ts
index c0f45581..f0ae6d4c 100644
--- a/src/router/reg-exp-router/router.ts
+++ b/src/router/reg-exp-router/router.ts
@@ -1,6 +1,6 @@
-import { Router, Result, METHOD_NAME_OF_ALL } from '../../router'
-import type { ParamMap } from './trie'
-import { Trie } from './trie'
+import { Router, Result, METHOD_NAME_OF_ALL } from '@/router'
+import type { ParamMap } from '@/router/reg-exp-router/trie'
+import { Trie } from '@/router/reg-exp-router/trie'
 
 type Route<T> = [string, T]
 type HandlerData<T> = [T, ParamMap | null]
diff --git a/src/router/reg-exp-router/trie.ts b/src/router/reg-exp-router/trie.ts
index 0111a5fc..f0358895 100644
--- a/src/router/reg-exp-router/trie.ts
+++ b/src/router/reg-exp-router/trie.ts
@@ -1,7 +1,7 @@
-import type { ParamMap, Context } from './node'
-import { Node } from './node'
+import type { ParamMap, Context } from '@/router/reg-exp-router/node'
+import { Node } from '@/router/reg-exp-router/node'
 
-export type { ParamMap } from './node'
+export type { ParamMap } from '@/router/reg-exp-router/node'
 export type ReplacementMap = number[]
 
 export class Trie {
diff --git a/src/router/trie-router/index.ts b/src/router/trie-router/index.ts
index c75ba247..b7a5bcb3 100644
--- a/src/router/trie-router/index.ts
+++ b/src/router/trie-router/index.ts
@@ -1 +1 @@
-export { TrieRouter } from './router'
+export { TrieRouter } from '@/router/trie-router/router'
diff --git a/src/router/trie-router/node.test.ts b/src/router/trie-router/node.test.ts
index 9afb313e..4654a09d 100644
--- a/src/router/trie-router/node.test.ts
+++ b/src/router/trie-router/node.test.ts
@@ -1,4 +1,4 @@
-import { Node } from './node'
+import { Node } from '@/router/trie-router/node'
 
 describe('Root Node', () => {
   const node = new Node()
diff --git a/src/router/trie-router/node.ts b/src/router/trie-router/node.ts
index f70a881e..c6659c53 100644
--- a/src/router/trie-router/node.ts
+++ b/src/router/trie-router/node.ts
@@ -1,6 +1,6 @@
-import type { Pattern } from '../../utils/url'
-import { splitPath, getPattern } from '../../utils/url'
-import { Result, METHOD_NAME_OF_ALL } from '../../router'
+import type { Pattern } from '@/utils/url'
+import { splitPath, getPattern } from '@/utils/url'
+import { Result, METHOD_NAME_OF_ALL } from '@/router'
 
 const noRoute = (): null => {
   return null
diff --git a/src/router/trie-router/router.test.ts b/src/router/trie-router/router.test.ts
index e8a83057..2f710964 100644
--- a/src/router/trie-router/router.test.ts
+++ b/src/router/trie-router/router.test.ts
@@ -1,4 +1,4 @@
-import { TrieRouter } from './router'
+import { TrieRouter } from '@/router/trie-router/router'
 
 describe('Basic Usage', () => {
   const router = new TrieRouter<string>()
diff --git a/src/router/trie-router/router.ts b/src/router/trie-router/router.ts
index b3ebacf2..5b22d3c3 100644
--- a/src/router/trie-router/router.ts
+++ b/src/router/trie-router/router.ts
@@ -1,6 +1,6 @@
-import { Router } from '../../router'
-import type { Result } from '../../router'
-import { Node } from './node'
+import { Router } from '@/router'
+import type { Result } from '@/router'
+import { Node } from '@/router/trie-router/node'
 
 export class TrieRouter<T> extends Router<T> {
   node: Node<T>
diff --git a/src/utils/body.test.ts b/src/utils/body.test.ts
index 00e0f3ae..5665977f 100644
--- a/src/utils/body.test.ts
+++ b/src/utils/body.test.ts
@@ -1,4 +1,4 @@
-import { parseBody } from './body'
+import { parseBody } from '@/utils/body'
 
 describe('Parse Body Middleware', () => {
   it('should parse JSON', async () => {
diff --git a/src/utils/buffer.test.ts b/src/utils/buffer.test.ts
index 42d46911..1afa7a39 100644
--- a/src/utils/buffer.test.ts
+++ b/src/utils/buffer.test.ts
@@ -1,4 +1,4 @@
-import { timingSafeEqual } from './buffer'
+import { timingSafeEqual } from '@/utils/buffer'
 import { SHA256 as sha256CryptoJS } from 'crypto-js'
 
 describe('buffer', () => {
diff --git a/src/utils/buffer.ts b/src/utils/buffer.ts
index 183316cb..962285fa 100644
--- a/src/utils/buffer.ts
+++ b/src/utils/buffer.ts
@@ -1,4 +1,4 @@
-import { sha256 } from './crypto'
+import { sha256 } from '@/utils/crypto'
 
 export const equal = (a: ArrayBuffer, b: ArrayBuffer) => {
   if (a === b) {
diff --git a/src/utils/cloudflare.test.ts b/src/utils/cloudflare.test.ts
index 25260e3d..ff59cbc8 100644
--- a/src/utils/cloudflare.test.ts
+++ b/src/utils/cloudflare.test.ts
@@ -1,4 +1,4 @@
-import { getContentFromKVAsset, getKVFilePath } from './cloudflare'
+import { getContentFromKVAsset, getKVFilePath } from '@/utils/cloudflare'
 
 // Mock
 const store: { [key: string]: string } = {
diff --git a/src/utils/crypto.test.ts b/src/utils/crypto.test.ts
index 2e2fc136..edf27577 100644
--- a/src/utils/crypto.test.ts
+++ b/src/utils/crypto.test.ts
@@ -1,4 +1,4 @@
-import { sha256, sha1, decodeBase64, encodeBase64 } from './crypto'
+import { sha256, sha1, decodeBase64, encodeBase64 } from '@/utils/crypto'
 
 describe('crypto', () => {
   it('sha256', async () => {
diff --git a/src/utils/http-status.test.ts b/src/utils/http-status.test.ts
index aae5dfe1..83431e20 100644
--- a/src/utils/http-status.test.ts
+++ b/src/utils/http-status.test.ts
@@ -1,4 +1,4 @@
-import { getStatusText } from './http-status'
+import { getStatusText } from '@/utils/http-status'
 
 describe('http-status utility', () => {
   it('getStatusText', () => {
diff --git a/src/utils/mime.test.ts b/src/utils/mime.test.ts
index 9532d07f..9b864235 100644
--- a/src/utils/mime.test.ts
+++ b/src/utils/mime.test.ts
@@ -1,4 +1,4 @@
-import { getMimeType } from './mime'
+import { getMimeType } from '@/utils/mime'
 
 describe('mime', () => {
   it('getMimeType', () => {
diff --git a/src/utils/url.test.ts b/src/utils/url.test.ts
index 57ea36fe..b5c79a1d 100644
--- a/src/utils/url.test.ts
+++ b/src/utils/url.test.ts
@@ -1,4 +1,4 @@
-import { splitPath, getPattern, getPathFromURL, isAbsoluteURL, mergePath } from './url'
+import { splitPath, getPattern, getPathFromURL, isAbsoluteURL, mergePath } from '@/utils/url'
 
 describe('url', () => {
   it('splitPath', () => {
diff --git a/tsconfig.build.json b/tsconfig.build.json
new file mode 100644
index 00000000..07d57331
--- /dev/null
+++ b/tsconfig.build.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "src/**/*.test.ts"
+  ]
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index c2552515..6266c90f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,12 +14,16 @@
       "jest",
       "node",
       "@cloudflare/workers-types"
-    ]
+    ],
+    "baseUrl": ".",
+    "paths": {
+      "@/*": [
+        "./src/*"
+      ]
+    },
   },
   "include": [
-    "src/**/*"
-  ],
-  "exclude": [
+    "src/**/*",
     "src/**/*.test.ts"
-  ]
+  ],
 }
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 3bb94651..12d039a7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -990,7 +990,7 @@ ansi-styles@^5.0.0:
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-5.2.0.tgz#07449690ad45777d1924ac2abb2fc8895dba836b"
   integrity sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==
 
-anymatch@^3.0.3:
+anymatch@^3.0.3, anymatch@~3.1.2:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-3.1.2.tgz#c0557c096af32f106198f4f4e2a383537e378716"
   integrity sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==
@@ -1106,6 +1106,11 @@ balanced-match@^1.0.0:
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz#e83e3a7e3f300b34cb9d87f615fa0cbf357690ee"
   integrity sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==
 
+binary-extensions@^2.0.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-2.2.0.tgz#75f502eeaf9ffde42fc98829645be4ea76bd9e2d"
+  integrity sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==
+
 brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
@@ -1114,7 +1119,7 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
-braces@^3.0.1:
+braces@^3.0.1, braces@~3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/braces/-/braces-3.0.2.tgz#3454e1a462ee8d599e236df336cd9ea4f8afe107"
   integrity sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==
@@ -1213,6 +1218,21 @@ char-regex@^1.0.2:
   resolved "https://registry.yarnpkg.com/char-regex/-/char-regex-1.0.2.tgz#d744358226217f981ed58f479b1d6bcc29545dcf"
   integrity sha512-kWWXztvZ5SBQV+eRgKFeh8q5sLuZY2+8WUIzlxWVTg+oGwY14qylx1KbKzHd8P6ZYkAg0xyIDU9JMHhyJMZ1jw==
 
+chokidar@^3.5.3:
+  version "3.5.3"
+  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.5.3.tgz#1cf37c8707b932bd1af1ae22c0432e2acd1903bd"
+  integrity sha512-Dr3sfKRP6oTcjf2JmUmFJfeVMvXBdegxB0iVQ5eb2V10uFJUCAS8OByZdVAyVb8xXNz3GjjTgj9kLWsZTqE6kw==
+  dependencies:
+    anymatch "~3.1.2"
+    braces "~3.0.2"
+    glob-parent "~5.1.2"
+    is-binary-path "~2.1.0"
+    is-glob "~4.0.1"
+    normalize-path "~3.0.0"
+    readdirp "~3.6.0"
+  optionalDependencies:
+    fsevents "~2.3.2"
+
 ci-info@^3.2.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-3.3.0.tgz#b4ed1fb6818dea4803a55c623041f9165d2066b2"
@@ -1273,6 +1293,11 @@ combined-stream@^1.0.8:
   dependencies:
     delayed-stream "~1.0.0"
 
+commander@^9.0.0:
+  version "9.2.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-9.2.0.tgz#6e21014b2ed90d8b7c9647230d8b7a94a4a419a9"
+  integrity sha512-e2i4wANQiSXgnrBlIatyHtP1odfUp0BbV5Y5nEGbxtIrStkEOAAzCUirvLBNXHLr7kwLvJl6V+4V3XV9x7Wd9w==
+
 concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
@@ -1880,7 +1905,7 @@ fs.realpath@^1.0.0:
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
   integrity sha1-FQStJSMVjKpA20onh8sBQRmU6k8=
 
-fsevents@^2.3.2:
+fsevents@^2.3.2, fsevents@~2.3.2:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.2.tgz#8a526f78b8fdf4623b709e0b975c52c24c02fd1a"
   integrity sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==
@@ -1932,7 +1957,7 @@ get-symbol-description@^1.0.0:
     call-bind "^1.0.2"
     get-intrinsic "^1.1.1"
 
-glob-parent@^5.1.2:
+glob-parent@^5.1.2, glob-parent@~5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.2.tgz#869832c58034fe68a4093c17dc15e8340d8401c4"
   integrity sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==
@@ -2130,6 +2155,13 @@ is-bigint@^1.0.1:
   dependencies:
     has-bigints "^1.0.1"
 
+is-binary-path@~2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-binary-path/-/is-binary-path-2.1.0.tgz#ea1f7f3b80f064236e83470f86c09c254fb45b09"
+  integrity sha512-ZMERYes6pDydyuGidse7OsHxtbI7WVeUEozgR/g7rd0xUimYNlvZRE/K2MgZTjWy725IfelLeVcEM97mmtRGXw==
+  dependencies:
+    binary-extensions "^2.0.0"
+
 is-boolean-object@^1.1.0:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/is-boolean-object/-/is-boolean-object-1.1.2.tgz#5c6dc200246dd9321ae4b885a114bb1f75f63719"
@@ -2172,7 +2204,7 @@ is-generator-fn@^2.0.0:
   resolved "https://registry.yarnpkg.com/is-generator-fn/-/is-generator-fn-2.1.0.tgz#7d140adc389aaf3011a8f2a2a4cfa6faadffb118"
   integrity sha512-cTIB4yPYL/Grw0EaSzASzg6bBy9gqCofvWN8okThAYIxKJZC+udlRAmGbM0XLeniEJSs8uEgHPGuHSe1XsOLSQ==
 
-is-glob@^4.0.0, is-glob@^4.0.1, is-glob@^4.0.3:
+is-glob@^4.0.0, is-glob@^4.0.1, is-glob@^4.0.3, is-glob@~4.0.1:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-4.0.3.tgz#64f61e42cbbb2eec2071a9dac0b28ba1e65d5084"
   integrity sha512-xelSayHH36ZgE7ZWhli7pW34hNbNl8Ojv5KVmkJD4hBdD3th8Tfk9vYasLM+mXWOZhFkgZfxhLSnrwRr4elSSg==
@@ -2976,6 +3008,11 @@ mustache@^4.2.0:
   resolved "https://registry.yarnpkg.com/mustache/-/mustache-4.2.0.tgz#e5892324d60a12ec9c2a73359edca52972bf6f64"
   integrity sha512-71ippSywq5Yb7/tVYyGbkBggbU8H3u5Rz56fH60jGFgr8uHwxs+aSKeqmluIVzM0m0kB7xQjKS6qPfd0b2ZoqQ==
 
+mylas@^2.1.9:
+  version "2.1.9"
+  resolved "https://registry.yarnpkg.com/mylas/-/mylas-2.1.9.tgz#8329626f95c0ce522ca7d3c192eca6221d172cdc"
+  integrity sha512-pa+cQvmhoM8zzgitPYZErmDt9EdTNVnXsH1XFjMeM4TyG4FFcgxrvK1+jwabVFwUOEDaSWuXBMjg43kqt/Ydlg==
+
 natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
@@ -2996,7 +3033,7 @@ node-releases@^2.0.1:
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-2.0.1.tgz#3d1d395f204f1f2f29a54358b9fb678765ad2fc5"
   integrity sha512-CqyzN6z7Q6aMeF/ktcMVTzhAHCEpf8SOarwpzpf8pNBY2k5/oM34UHldUwp8VKI7uxct2HxSRdJjBaZeESzcxA==
 
-normalize-path@^3.0.0:
+normalize-path@^3.0.0, normalize-path@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
   integrity sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==
@@ -3165,7 +3202,7 @@ picocolors@^1.0.0:
   resolved "https://registry.yarnpkg.com/picocolors/-/picocolors-1.0.0.tgz#cb5bdc74ff3f51892236eaf79d68bc44564ab81c"
   integrity sha512-1fygroTLlHu66zi26VoTDv8yRgm0Fccecssto+MhsZ0D/DGW2sm8E8AjW7NU5VVTRt5GxbeZ5qBuJr+HyLYkjQ==
 
-picomatch@^2.0.4, picomatch@^2.2.3:
+picomatch@^2.0.4, picomatch@^2.2.1, picomatch@^2.2.3:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.1.tgz#3ba3833733646d9d3e4995946c1365a67fb07a42"
   integrity sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==
@@ -3244,6 +3281,13 @@ react-is@^17.0.1:
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-17.0.2.tgz#e691d4a8e9c789365655539ab372762b0efb54f0"
   integrity sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==
 
+readdirp@~3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.6.0.tgz#74a370bd857116e245b29cc97340cd431a02a6c7"
+  integrity sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==
+  dependencies:
+    picomatch "^2.2.1"
+
 regexpp@^3.0.0, regexpp@^3.1.0, regexpp@^3.2.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-3.2.0.tgz#0425a2768d8f23bad70ca4b90461fa2f1213e1b2"
@@ -3634,6 +3678,17 @@ ts-jest@^27.1.2:
     semver "7.x"
     yargs-parser "20.x"
 
+tsc-alias@^1.6.6:
+  version "1.6.6"
+  resolved "https://registry.yarnpkg.com/tsc-alias/-/tsc-alias-1.6.6.tgz#1bdda705efa6251b9a62593e8ed4b0285c20803b"
+  integrity sha512-wQuIKleaPuQKpTwrzFb1gTOd3ZsB5GqIK+aPyh1okOLfYYNsMyxIypIYctQnSxiJ243iRxLdvNlboZOTEdK1MQ==
+  dependencies:
+    chokidar "^3.5.3"
+    commander "^9.0.0"
+    globby "^11.0.4"
+    mylas "^2.1.9"
+    normalize-path "^3.0.0"
+
 tsconfig-paths@^3.12.0, tsconfig-paths@^3.9.0:
   version "3.12.0"
   resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.12.0.tgz#19769aca6ee8f6a1a341e38c8fa45dd9fb18899b"