Add formatCurrency method to shared package as well

shared/browser_shared/helpers.ts

@@ -1,3 +1,8 @@
+import { Configschema } from '@esa-layouts/types/schemas';
+import { DeepWritable } from 'ts-essentials';
+
+const config = nodecg.bundleConfig;
+
 /**
  * Checks if number needs a 0 adding to the start and does so if needed.
  * @param num Number which you want to turn into a padded string.
@@ -19,10 +24,25 @@ export function msToTimeStr(ms: number): string {
     }:${padTimeNumber(seconds)}`;
 }
 
+/**
+ * Simple formatter for displaying currency amounts.
+ * @param amount Amount as a integer/float.
+ * @param _symbol The currency symbol (defaults to what's set in the config)
+ */
+export function formatCurrency(
+  amount: number,
+  _symbol?: string,
+): string {
+  const cfg = (config as DeepWritable<Configschema>).event.currency;
+  const symbol = _symbol || cfg.symbol;
+
+  return `${symbol}${amount.toFixed(2)}`;
+}
+
 /**
  * Simple formatter for displaying USD amounts.
  * @param amount Amount as a integer/float.
  */
 export function formatUSD(amount: number): string {
-  return `$${amount.toFixed(2)}`;
+  return formatCurrency(amount);
 }