feat: add fetchSwappableCurrency

src/alexSDK.ts

@@ -16,7 +16,11 @@ import {
   broadcastSponsoredTx,
   isSponsoredSwapEnabled,
 } from './utils/sponsoredTx';
-import { fetchTokenList, TokenInfo } from './utils/tokenlist';
+import {
+  fetchSwappableCurrency,
+  fetchTokenList,
+  TokenInfo,
+} from './utils/tokenlist';
 export { SponsoredTxError, SponsoredTxErrorCode } from './utils/sponsoredTx';
 
 export class AlexSDK {
@@ -112,6 +116,10 @@ export class AlexSDK {
   }
 
   fetchTokenList(): Promise<TokenInfo[]> {
-    return fetchTokenList()
+    return fetchTokenList();
+  }
+
+  fetchSwappableCurrency(): Promise<TokenInfo[]> {
+    return fetchSwappableCurrency();
   }
 }

src/utils/tokenlist.ts

@@ -1,18 +1,28 @@
+import { Currency } from '../currency';
+
 export type TokenInfo = {
-  type: 'fungibleToken',
-  id: string,
-  name: string
-  displayPrecision: number,
-  icon: string,
-  availableInSwap: boolean,
-  contractAddress: string,
-  decimals: number
-}
+  type: 'fungibleToken';
+  id: string;
+  name: string;
+  displayPrecision: number;
+  icon: string;
+  availableInSwap: boolean;
+  contractAddress: string;
+  decimals: number;
+};
 
 export function fetchTokenList(): Promise<TokenInfo[]> {
   return fetch('https://token-list.alexlab.co', {
-    mode: 'cors'
+    mode: 'cors',
   })
-    .then(res => res.json())
-    .then(data => data.tokens)
+    .then((res) => res.json())
+    .then((data) => data.tokens);
+}
+
+export async function fetchSwappableCurrency(): Promise<TokenInfo[]> {
+  const tokens = await fetchTokenList();
+  return tokens.filter(
+    (x) =>
+      x.availableInSwap && Object.values(Currency).includes(x.id as Currency)
+  );
 }