move some logic and constants into their own file

src/constants.js

@@ -0,0 +1 @@
+export const graphql_endpoint = 'https://www.facebook.com/api/graphql/';

src/logic.js

@@ -0,0 +1,6 @@
+export const event_url = (event_id) =>
+  `https://www.facebook.com/events/${event_id}`;
+
+const page_url = (page_id) => `https://www.facebook.com/${page_id}`;
+
+export const page_events_url = (page_id) => page_url(page_id) + '/events/';

src/scrape.js

@@ -6,9 +6,8 @@ const path = require('path');
 const fs = require('fs').promises;
 const gm = require('gm').subClass({ imageMagick: true });
 
-const graphql_endpoint = 'https://www.facebook.com/api/graphql/';
-const facebook_event_url = (event_id) =>
-  `https://www.facebook.com/events/${event_id}/`;
+import { graphql_endpoint } from './constants';
+import { page_events_url, event_url } from './logic';
 
 const get_upcoming_events = pathOr(
   null,
@@ -146,11 +145,11 @@ const argv = parse_args(process.argv.slice(2));
 const page_ids = pathOr('', ['page_ids'], argv)
   .split(',')
   .filter((str) => str.length !== 0)
-  .map((page_id) => `https://www.facebook.com/${page_id}/events/`);
+  .map(page_events_url);
 const event_ids = pathOr('', ['event_ids'], argv)
   .split(',')
   .filter((str) => str.length !== 0)
-  .map((event_id) => `https://www.facebook.com/events/${event_id}`);
+  .map(event_url);
 
 const register_upcoming_events_listener = (endpoint, page) => {
   let responses = [];