diff --git a/package.json b/package.json
index 63313f0..f89a30e 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
 	"name": "nodejs-whisper",
-	"version": "0.0.3",
+	"version": "0.0.6",
 	"description": "Node bindings for OpenAI's Whisper. Optimized for CPU.",
 	"main": "dist/index.js",
+	"types": "dist/index.d.ts",
 	"publishConfig": {
 		"access": "public"
 	},
diff --git a/src/WhisperHelper.ts b/src/WhisperHelper.ts
index 84beaac..17d6e7e 100644
--- a/src/WhisperHelper.ts
+++ b/src/WhisperHelper.ts
@@ -4,10 +4,14 @@ import fs from 'fs'
 import { MODELS, MODELS_LIST, MODEL_OBJECT } from './constants'
 
 export const constructCommand = (filePath: string, args: IOptions) => {
+	if (args?.modelName == undefined) {
+		throw new Error('[Nodejs-whisper] Error: Provide model name')
+	}
+
 	let anyModelExist = []
 
 	MODELS.forEach(model => {
-		if (!fs.existsSync(path.join(__dirname, '..', 'cpp', 'whisper.cpp', 'models', MODEL_OBJECT[args.modelName]))) {
+		if (!fs.existsSync(path.join(__dirname, '..', 'cpp', 'whisper.cpp', 'models', MODEL_OBJECT[args?.modelName]))) {
 		} else {
 			anyModelExist.push(model)
 		}
@@ -20,10 +24,19 @@ export const constructCommand = (filePath: string, args: IOptions) => {
 
 	const modelName = MODEL_OBJECT[args.modelName as keyof typeof MODEL_OBJECT]
 
-	if (MODELS_LIST.indexOf(args.modelName) === -1) {
+	if (MODELS_LIST.indexOf(args?.modelName) === -1) {
 		throw new Error('[Nodejs-whisper] Error: Model not found')
 	}
-	let command = `./main  ${constructOptionsFlags(args)} -l auto -m ./models/${modelName}  -f ${filePath}  `
+
+	const defaultOutput =
+		!args?.whisperOptions?.outputInCsv &&
+		!args?.whisperOptions?.outputInSrt &&
+		!args?.whisperOptions?.outputInText &&
+		!args?.whisperOptions?.outputInVtt
+
+	let command = `./main  ${constructOptionsFlags(args)} ${
+		defaultOutput && '-osrt'
+	}  -l auto -m ./models/${modelName}  -f ${filePath}  `
 
 	return command
 }
@@ -51,7 +64,7 @@ const constructOptionsFlags = (args: IOptions) => {
 	if (args?.whisperOptions?.timestamps_length) {
 		flag += `-ml ${args.whisperOptions.timestamps_length} `
 	}
-	if (args.whisperOptions.splitOnWord) {
+	if (args?.whisperOptions?.splitOnWord) {
 		flag += `-sow true `
 	}
 	return flag
diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..5630470
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,17 @@
+export interface WhisperOptions {
+	outputInText?: boolean
+	outputInVtt?: boolean
+	outputInSrt?: boolean
+	outputInCsv?: boolean
+	translateToEnglish?: boolean
+	timestamps_length?: number
+	wordTimestamps?: boolean
+	splitOnWord?: boolean
+}
+
+export interface IOptions {
+	modelName: string
+	whisperOptions?: WhisperOptions
+}
+
+export declare function nodewhisper(filePath: string, options: IOptions): Promise<string>
diff --git a/src/index.ts b/src/index.ts
index 21bacea..00c563c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,6 @@ import downloadModel from './downloadModel'
 
 import { constructCommand } from './WhisperHelper'
 import { checkIfFileExists, convertToWavType } from './utils'
-import path from 'path'
 
 export interface IOptions {
 	modelName: string
@@ -27,19 +26,3 @@ export async function nodewhisper(filePath: string, options: IOptions) {
 
 	return transcript
 }
-
-// const filePath = path.resolve(__dirname, '..', 'test.wav')
-
-// nodewhisper(filePath, {
-// 	modelName: 'base.en',
-// 	whisperOptions: {
-// 		outputInText: false,
-// 		outputInVtt: false,
-// 		outputInSrt: true,
-// 		outputInCsv: false,
-// 		translateToEnglish: false,
-// 		wordTimestamps: false,
-// 		timestamps_length: 20,
-// 		splitOnWord: true,
-// 	},
-// })
diff --git a/tsconfig.json b/tsconfig.json
index ff87005..eae998b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
 		"esModuleInterop": true,
 		"target": "es6",
 		"moduleResolution": "node",
+		"declaration": true,
 		"sourceMap": true,
 		"outDir": "dist"
 	},