Export functions instead of using class with only static members

Theres's no need to use a class all members are static and we never instantiate
it — it's not Java :D

src/background.ts

@@ -20,8 +20,8 @@ import * as browser from 'webextension-polyfill';
 import { MessageKind, RedirectType } from './types';
 import constants from './constants';
 import Preferences from './preferences';
-import InvidiousAPI from './invidious-api';
-import PeertubeAPI from './peertube-api';
+import * as InvidiousAPI from './invidious-api';
+import * as PeertubeAPI from './peertube-api';
 import { getPeertubeVideoURL } from './util';
 
 /**

src/invidious-api.ts

@@ -1,8 +1,7 @@
 import * as _ from 'lodash/fp';
 import constants from './constants';
 
-export default class InvidiousAPI {
-    private static async fetchAPI(action: string, params: any) {
+async function fetchAPI(action: string, params: any) {
     const paramString = typeof params == 'string'
         ? params
         : Object.keys(params).map(function(key) {
@@ -15,13 +14,13 @@ export default class InvidiousAPI {
             'An error occured while trying to fetch Invidious API used by PeerTubeify: '
             + e.message
         ));
-    }
-
-    static async getVideo(id: string) {
-        return this.fetchAPI(constants.invidiousAPI.videos, id);
-    }
-
-    static async getChannel(ucid: string) {
-        return this.fetchAPI(constants.invidiousAPI.channels, ucid);
-    }
+}
+
+
+export async function getVideo(id: string) {
+    return fetchAPI(constants.invidiousAPI.videos, id);
+}
+
+export async function getChannel(ucid: string) {
+    return fetchAPI(constants.invidiousAPI.channels, ucid);
 }

src/peertube-api.ts

@@ -1,8 +1,7 @@
 import * as _ from 'lodash/fp';
 import constants from './constants';
 
-export default class PeertubeAPI {
-    private static async fetchAPI(path: string, query?: Object) {
+async function fetchAPI(path: string, query?: Object) {
     const instance = _.getOr(constants.peertubeAPI.defaultInstance, 'searchInstance', await browser.storage.local.get()).toString();
 
     let url = `https://${instance}/${constants.peertubeAPI.endpoint}/${path}`;
@@ -17,13 +16,12 @@ export default class PeertubeAPI {
             `An error occured while trying to fetch ${instance} API used by PeerTubeify: `
             + e.message
         ));
-    }
-
-    static async getVideo(id: string) {
-        return this.fetchAPI('videos/' + id);
-    }
-
-    static async searchVideo(query: Object) {
-        return this.fetchAPI('search/videos', query);
-    }
+}
+
+export async function getVideo(id: string) {
+    return fetchAPI('videos/' + id);
+}
+
+export async function searchVideo(query: Object) {
+    return fetchAPI('search/videos', query);
 }