Add error code and message

src/constants/ErrorCode.ts

@@ -0,0 +1,6 @@
+export enum ErrorCode {
+    Unknown,
+    FailedToFetchReddit,
+    UnableToParseJSON,
+    NoImageResultsFound,
+}

src/constants/ErrorMessages.ts

@@ -0,0 +1,5 @@
+export default class ErrorMessages {
+    public static readonly FailedToFetchReddit = "Failed to fetch result from Reddit";
+    public static readonly UnableToParseJSON = "Unable to parse the JSON result";
+    public static readonly NoImageResultsFound = "No image results found in response from Reddit";
+}

src/contracts/IError.ts

@@ -0,0 +1,6 @@
+import { ErrorCode } from "../constants/ErrorCode";
+
+export default interface IError {
+    Code: ErrorCode;
+    Message: string;
+}

src/contracts/IReturnResult.ts

@@ -1,6 +1,8 @@
+import IError from "./IError.js";
 import IRedditResult from "./IRedditResult.js";
 
 export default interface IReturnResult {
     IsSuccess: boolean;
     Result?: IRedditResult;
+    Error?: IError;
 }

src/index.ts

@@ -3,6 +3,8 @@ import IRedditResult from "./contracts/IRedditResult.js";
 import fetch from "got-cjs";
 import { List } from 'linqts';
 import IFetchResult from "./contracts/IFetchResult.js";
+import { ErrorCode } from "./constants/ErrorCode.js";
+import ErrorMessages from "./constants/ErrorMessages.js";
 
 const sortable = [
     'new',
@@ -17,7 +19,11 @@ export default async function randomBunny(subreddit: string, sortBy?: string): P
 
     if (!result) {
         return {
-            IsSuccess: false
+            IsSuccess: false,
+            Error: {
+                Code: ErrorCode.FailedToFetchReddit,
+                Message: ErrorMessages.FailedToFetchReddit,
+            },
         }
     }
 
@@ -25,7 +31,11 @@ export default async function randomBunny(subreddit: string, sortBy?: string): P
 
     if (!json) {
         return {
-            IsSuccess: false
+            IsSuccess: false,
+            Error: {
+                Code: ErrorCode.UnableToParseJSON,
+                Message: ErrorMessages.FailedToFetchReddit,
+            },
         }
     }
 
@@ -40,6 +50,10 @@ export default async function randomBunny(subreddit: string, sortBy?: string): P
     if (dataWithImages.length == 0) {
         return {
             IsSuccess: false,
+            Error: {
+                Code: ErrorCode.NoImageResultsFound,
+                Message: ErrorMessages.NoImageResultsFound,
+            },
         };
     } else {
         random = Math.floor((Math.random() * (dataWithImages.length - 1)) + 0); // Between 0 and (size - 1)