Add string literal types to function

src/contracts/ICliOptions.ts

@@ -1,6 +1,6 @@
 export default interface ICliOptions {
     subreddit: string,
     json?: boolean,
-    sort: string,
+    sort: "new" | "hot" | "top",
     queryMetadata?: boolean,
 }

src/index.ts

@@ -7,15 +7,7 @@ import { ErrorCode } from "./constants/ErrorCode";
 import ErrorMessages from "./constants/ErrorMessages";
 import ImageHelper from "./imageHelper";
 
-const sortable = [
-    'new',
-    'hot',
-    'top'
-];
-
-export default async function randomBunny(subreddit: string, sortBy: string = 'hot'): Promise<IReturnResult> {
-    if (!sortable.includes(sortBy)) sortBy = 'hot';
-
+export default async function randomBunny(subreddit: string, sortBy: "new" | "hot" | "top" = 'hot'): Promise<IReturnResult> {
     const result = await fetch(`https://reddit.com/r/${subreddit}/${sortBy}.json?limit=100`)
         .then((res) => {
             return res;

tests/index.test.ts

@@ -72,38 +72,6 @@ describe('randomBunny', () => {
         expect(fetchMock).toHaveBeenCalledWith('https://reddit.com/r/rabbits/hot.json?limit=100');
     });
 
-    test('GIVEN sortBy is NOT valid, expect it to default to hot', async () => {
-        fetchMock.mockResolvedValue({
-            body: JSON.stringify({
-                data: {
-                    children: [
-                        {
-                            data: {
-                                archived: false,
-                                downs: 0,
-                                hidden: false,
-                                permalink: '/r/Rabbits/comments/12pa5te/someone_told_pickles_its_monday_internal_fury/',
-                                subreddit: 'Rabbits',
-                                subreddit_subscribers: 298713,
-                                title: 'Someone told pickles it’s Monday… *internal fury*',
-                                ups: 1208,
-                                url: 'https://i.redd.it/cr8xudsnkgua1.jpg',
-                            },
-                        },
-                    ],
-                }
-            }),
-        });
-
-        const result = await randomBunny('rabbits', 'invalid');
-
-        expect(result.IsSuccess).toBeTruthy();
-        expect(result.Result).toBeDefined();
-        expect(result.Error).toBeUndefined();
-
-        expect(fetchMock).toHaveBeenCalledWith('https://reddit.com/r/rabbits/hot.json?limit=100');
-    });
-
     test('GIVEN the fetch fails, EXPECT failure result', async () => {
         fetchMock.mockRejectedValue('Test Reason')