feat: updated getSubstackFeedByLink method signature (#10)

* feat: updated getSubstackFeedByLink method signature

now returns raw XML string when no callback is passed

* 1.0.3

---------

Co-authored-by: GitHub Actions <actions@github.com>

.github/workflows/test_format.yml

@@ -24,7 +24,7 @@ jobs:
       - run: npm run build --if-present
       # Commit changes
       - name: Commit changes using git-auto-commit-action@v5
-        uses: stefanzweifel/git-auto-commit-action@v5
+        uses: stefanzweifel/git-auto-commit-action@v5.0.1
         id: auto-commit-action
         with:
           commit_message: Prettier format

README.md

@@ -29,23 +29,36 @@ npm install substack-feed-api
 2. Import the API into your project:
 
 ```typescript
-import { SubstackFeedApi } from 'substack-feed-api';
+import { getSubstackFeed } from 'substack-feed-api';
 ```
 
 ### Usage
 
 Here's a quick example to get you started:
 
 ```typescript
-const api = new SubstackFeedApi();
+getSubstackFeed('your-substack-newsletter-name')
+  .then((feed) => {
+    console.log(feed);
+  })
+  .catch((error) => {
+    console.error(error);
+  });
+```
+
+There is also a possibility to pass your own callback function to the `getSubstackFeed` function.
+This function will be called with the parsed feed data as an argument:
 
-api.fetchNewsletter('your-substack-newsletter-name').then(feed => {
-  console.info(feed);
-}).catch(error => {
-  console.error('Error fetching newsletter:', error);
+```typescript
+getSubstackFeed('your-substack-newsletter-name', (err, result) => {
+  console.log(result);
 });
 ```
 
+You can also use the other exported functions from the package:
+- `getFeedByLink`: Fetch a specific feed by its link.
+- `getPosts`: Get all posts from a feed.
+
 Replace `'your-substack-newsletter-name'` with the name of the Substack newsletter you wish to fetch.
 
 ## Development
@@ -87,4 +100,4 @@ Contributions are welcome! Feel free to open an issue or submit a pull request i
 ## License
 
 This project is licensed under the MIT License.
-```
+```

lib/main.ts

@@ -1,14 +1,17 @@
 import * as parser from "xml2js";
-import { RawFeedChannel, RawItem, SubstackItem } from "./types";
 import { isRawFeed, isRawFeedChannel } from "./typeguards";
+import { RawFeedChannel, RawItem, SubstackItem } from "./types";
 
-const CORS_PROXY = "https://corsproxy.io/?";
+const CORS_PROXY = "https://api.allorigins.win/get?url=";
 
 // Internal API
 
-const getRawXMLSubstackFeed = async (feedUrl: string) => {
+const getRawXMLSubstackFeed = async (feedUrl: string, proxy = false) => {
   try {
-    const promise = await fetch(`${CORS_PROXY}${encodeURIComponent(feedUrl)}`);
+    const path = proxy
+      ? `${CORS_PROXY}${encodeURIComponent(feedUrl)}`
+      : feedUrl;
+    const promise = await fetch(path);
     if (promise.ok) return promise.text();
   } catch (e) {
     throw new Error("Error occurred fetching Feed from Substack");
@@ -36,10 +39,12 @@ const transformRawItem = (item: RawItem): SubstackItem => {
 
 export const getSubstackFeed = async (
   feedUrl: string,
+  proxy = false,
   /* eslint-disable @typescript-eslint/no-explicit-any */
-  callback: (err: Error | null, result: any) => void,
-): Promise<void> => {
-  const rawXML = await getRawXMLSubstackFeed(feedUrl);
+  callback?: (err: Error | null, result: any) => void,
+): Promise<string | undefined> => {
+  const rawXML = await getRawXMLSubstackFeed(feedUrl, proxy);
+  if (!callback) return rawXML;
   await parseXML(rawXML, callback);
 };
 export const getFeedByLink = (