diff --git a/package.json b/package.json
index 12c831e8..d5e5c8ca 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "openapi-typescript-codegen",
-    "version": "0.5.1",
+    "version": "0.5.2",
     "description": "NodeJS library that generates Typescript or Javascript clients based on the OpenAPI specification.",
     "author": "Ferdi Koomen",
     "homepage": "https://github.com/ferdikoomen/openapi-typescript-codegen",
@@ -34,12 +34,14 @@
     ],
     "main": "dist/index.js",
     "module": "dist/index.js",
+    "types": "types/index.d.ts",
     "bin": {
         "openapi": "bin/index.js"
     },
     "files": [
         "bin/index.js",
-        "dist/index.js"
+        "dist/index.js",
+        "types/index.d.ts"
     ],
     "scripts": {
         "clean": "rimraf ./dist ./test/generated ./test/e2e/generated ./samples/generated ./coverage ./node_modules/.cache",
@@ -52,10 +54,10 @@
         "test:watch": "jest --selectProjects UNIT --watch",
         "test:coverage": "jest --selectProjects UNIT --coverage",
         "test:e2e": "jest --selectProjects E2E --runInBand",
-        "eslint": "eslint \"./src/**/*.ts\" \"./bin/index.js\"",
-        "eslint:fix": "eslint \"./src/**/*.ts\" \"./bin/index.js\" --fix",
-        "prettier": "prettier \"./src/**/*.ts\" \"./bin/index.js\" --check",
-        "prettier:fix": "prettier \"./src/**/*.ts\" \"./bin/index.js\" --write",
+        "eslint": "eslint \"./src/**/*.ts\" \"./bin/index.js\" \"./types/index.d.ts\"",
+        "eslint:fix": "eslint \"./src/**/*.ts\" \"./bin/index.js\" \"./types/index.d.ts\" --fix",
+        "prettier": "prettier \"./src/**/*.ts\" \"./bin/index.js\" \"./types/index.d.ts\" --check",
+        "prettier:fix": "prettier \"./src/**/*.ts\" \"./bin/index.js\" \"./types/index.d.ts\" --write",
         "prepublish": "yarn run clean && yarn run release",
         "codecov": "codecov --token=66c30c23-8954-4892-bef9-fbaed0a2e42b"
     },
diff --git a/types/index.d.ts b/types/index.d.ts
new file mode 100644
index 00000000..3a1e774f
--- /dev/null
+++ b/types/index.d.ts
@@ -0,0 +1,20 @@
+export declare enum HttpClient {
+    FETCH = 'fetch',
+    XHR = 'xhr',
+    NODE = 'node',
+}
+
+export interface Options {
+    input: string | Record<string, any>;
+    output: string;
+    httpClient?: HttpClient;
+    useOptions?: boolean;
+    useUnionTypes?: boolean;
+    exportCore?: boolean;
+    exportServices?: boolean;
+    exportModels?: boolean;
+    exportSchemas?: boolean;
+    write?: boolean;
+}
+
+export declare function generate(options: Options): Promise<void>;
diff --git a/yarn.lock b/yarn.lock
index 19b13803..7e4fc51c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4369,9 +4369,9 @@ ms@2.1.2:
   integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
 
 nan@^2.12.1:
-  version "2.14.1"
-  resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.1.tgz#d7be34dfa3105b91494c3147089315eff8874b01"
-  integrity sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw==
+  version "2.14.2"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.2.tgz#f5376400695168f4cc694ac9393d0c9585eeea19"
+  integrity sha512-M2ufzIiINKCuDfBSAUr1vWQ+vuVcA9kqx8JJUsbQi6yf1uGRyb7HfpdfUr5qLXf3B/t8dPvcjhKMmlfnP47EzQ==
 
 nanomatch@^1.2.9:
   version "1.2.13"