diff --git a/fixtures/output/example-0001.d.ts b/fixtures/output/example-0001.d.ts
index 7c54255..c6cab0b 100644
--- a/fixtures/output/example-0001.d.ts
+++ b/fixtures/output/example-0001.d.ts
@@ -1,8 +1,10 @@
 /**
  * Example of const declaration
  */
-export declare const config: { [key: string]: string }
-
+export declare const config: {
+  apiUrl: 'https://api.example.com',
+  timeout: '5000'
+}
 /**
  * Example of interface declaration
  */
@@ -11,7 +13,6 @@ export interface User {
   name: string
   email: string
 }
-
 /**
  * Example of type declaration
  */
@@ -19,7 +20,6 @@ export interface ResponseData {
   success: boolean
   data: User[]
 }
-
 /**
  * Example of function declaration
  */
diff --git a/fixtures/output/example-0005.d.ts b/fixtures/output/example-0005.d.ts
index f08f8c4..644e540 100644
--- a/fixtures/output/example-0005.d.ts
+++ b/fixtures/output/example-0005.d.ts
@@ -1,15 +1,12 @@
 export declare const defaultHeaders: {
   'Content-Type': 'application/json',
 }
-
 export interface Comment {
   id: number
   postId: number
   body: string
 }
-
 export interface CommentsResponse {
   comments: Comment[]
 }
-
 export declare function fetchComments(postId: number): Promise<CommentsResponse>
diff --git a/src/extract.ts b/src/extract.ts
index f8d54b8..07f84ed 100644
--- a/src/extract.ts
+++ b/src/extract.ts
@@ -50,17 +50,14 @@ export async function extractTypeFromSource(filePath: string): Promise<string> {
   // Function to parse object literal
   function parseObjectLiteral(str: string) {
     const obj: Record<string, string> = {}
-    str.split(',').forEach((pair) => {
-      const trimmedPair = pair.trim()
-      if (trimmedPair) {
-        const colonIndex = trimmedPair.indexOf(':')
-        if (colonIndex !== -1) {
-          const key = trimmedPair.slice(0, colonIndex).trim().replace(/['"]/g, '')
-          const value = trimmedPair.slice(colonIndex + 1).trim()
-          obj[key] = value
-        }
-      }
-    })
+    const regex = /(['"]?)([^\s'":]+)\1\s*:\s*(['"]?)([^\s'"]+)\3/g
+    let match
+
+    while ((match = regex.exec(str)) !== null) {
+      const [, , key, , value] = match
+      obj[key] = value
+    }
+
     return obj
   }
 
@@ -79,8 +76,8 @@ export async function extractTypeFromSource(filePath: string): Promise<string> {
         // Parse the object literal
         const parsedValue = parseObjectLiteral(constValue.slice(1, -1))
         const formattedValue = Object.entries(parsedValue)
-          .map(([key, value]) => `  ${key}: ${value.includes('/') || value.includes('\'') ? value : `'${value}'`}`)
-          .join('\n')
+          .map(([key, value]) => `  ${key}: ${value.includes('/') || value.includes('\'') ? `'${value}'` : value}`)
+          .join(',\n')
 
         if (pendingComment) {
           declarations += `${pendingComment}\n`