diff --git a/.eslintignore b/.eslintignore
index fc40c5a..5cc6223 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1 +1,2 @@
 /**/*.js
+build/**
diff --git a/.github/workflows/npm-publish.yml b/.github/workflows/npm-publish.yml
index c65fd7e..5665b9f 100644
--- a/.github/workflows/npm-publish.yml
+++ b/.github/workflows/npm-publish.yml
@@ -44,7 +44,7 @@ jobs:
       uses: stefanzweifel/git-auto-commit-action@v4
       with:
         branch: master
-        file_pattern: build/src/*.js build/src/*.js.map
+        file_pattern: build/src/*.js build/src/*.js.map build/src/*.d.ts
         commit_message: 'Fix: Automated apply build files'
         status_options: '--untracked-files=no'
 
diff --git a/build/src/main.d.ts b/build/src/main.d.ts
new file mode 100644
index 0000000..6a0a9fa
--- /dev/null
+++ b/build/src/main.d.ts
@@ -0,0 +1,18 @@
+/// <reference types="node" />
+export declare const targets: {
+    weston: string;
+    korean: string;
+    japanese: string;
+    chinese: string;
+    chinese_traditional: string;
+};
+export declare function getUnicodeRanges(dirPath?: string, url?: string): Promise<string[]>;
+interface fontRangeOptionI {
+    savePath: string;
+    format: string;
+    nameFormat: string;
+    defaultArgs: string;
+    etcArgs: string;
+}
+export declare function fontRange(url?: string, fontPath?: string, fontRangeOption?: fontRangeOptionI['savePath'] | Partial<fontRangeOptionI>): Promise<Buffer[]>;
+export {};
diff --git a/build/src/types.d.ts b/build/src/types.d.ts
new file mode 100644
index 0000000..1cb1317
--- /dev/null
+++ b/build/src/types.d.ts
@@ -0,0 +1,4 @@
+declare type Diff<T, U> = T extends U ? never : T;
+export declare type RequiredByValueExcept<T, TOptional extends keyof T> = Pick<T, Diff<keyof T, TOptional>> & Partial<T>;
+export declare type ValueOf<T> = T[keyof T];
+export {};
diff --git a/package-lock.json b/package-lock.json
index 9f47ab9..499c8a4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "font-range",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "font-range",
-      "version": "0.2.0",
+      "version": "0.2.1",
       "license": "MIT",
       "dependencies": {
         "@types/css-tree": "^1.0.7",
diff --git a/package.json b/package.json
index d5d4064..4f2d09e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "font-range",
   "description": " Font subset with google font's ML result.",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "author": "black7375 <alstjr7375@daum.net>",
   "license": "MIT",
   "keywords": [
@@ -43,6 +43,7 @@
     "typescript": "^4.4.5"
   },
   "main": "build/src/main.js",
+  "typings": "build/src/main.d.ts",
   "scripts": {
     "clean": "rimraf coverage build tmp",
     "build": "tsc -p tsconfig.release.json",
diff --git a/tsconfig.json b/tsconfig.json
index 208886b..09aef01 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -24,5 +24,8 @@
   "include": [
     "src/**/*",
     "__tests__/**/*"
+  ],
+  "exclude": [
+    "build/**/*"
   ]
 }
diff --git a/tsconfig.release.json b/tsconfig.release.json
index a7ed494..07cc042 100644
--- a/tsconfig.release.json
+++ b/tsconfig.release.json
@@ -3,7 +3,8 @@
   "compilerOptions": {
     "rootDir": ".",
     "outDir": "build",
-    "removeComments": true
+    "removeComments": true,
+    "declaration": true
   },
   "include": [
     "src/**/*"