indexer-common: replace usage of in for undefined check

A property may be present in an object but have value undefined.
Therefore, x in obj is not the same as obj.x === undefined.

Author: tilacog

packages/indexer-common/src/indexer-management/types.ts

@@ -165,11 +165,11 @@ const Caip2ByChainId: { [key: number]: string } = {
 /// or chain ids (numbers).
 export function resolveChainId(key: number | string): string {
   if (typeof key === 'number') {
-    if (key in Caip2ByChainId) {
+    if (Caip2ByChainId[key] !== undefined) {
       return Caip2ByChainId[key]
     }
   } else {
-    if (key in Caip2ByChainAlias) {
+    if (Caip2ByChainAlias[key] !== undefined) {
       return Caip2ByChainAlias[key]
     }
   }