CryptoDonate: convert utils to ts

app/soapbox/features/crypto_donate/utils/block_explorer.js

@@ -1,7 +0,0 @@
-import blockExplorers from './block_explorers.json';
-
-export const getExplorerUrl = (ticker, address) => {
-  const template = blockExplorers[ticker];
-  if (!template) return false;
-  return template.replace('{address}', address);
-};

app/soapbox/features/crypto_donate/utils/block_explorer.ts

@@ -0,0 +1,9 @@
+import blockExplorers from './block_explorers.json';
+
+type BlockExplorers = Record<string, string | null>;
+
+export const getExplorerUrl = (ticker: string, address: string): string | null => {
+  const template = (blockExplorers as BlockExplorers)[ticker];
+  if (!template) return null;
+  return template.replace('{address}', address);
+};