Add supplyOf query

packages/stargate/src/queries/bank.spec.ts

@@ -137,5 +137,29 @@ describe("BankExtension", () => {
         ]);
       });
     });
+
+    describe("supplyOf", () => {
+      it("works for existing denom", async () => {
+        pendingWithoutSimapp();
+        const client = await makeBankClient(simapp.tendermintUrl);
+
+        const response = await client.bank.unverified.supplyOf(simapp.denomFee);
+        expect(response).toEqual({
+          amount: "18000000000",
+          denom: simapp.denomFee,
+        });
+      });
+
+      it("returns zero for non-existent denom", async () => {
+        pendingWithoutSimapp();
+        const client = await makeBankClient(simapp.tendermintUrl);
+
+        const response = await client.bank.unverified.supplyOf("gintonic");
+        expect(response).toEqual({
+          amount: "0",
+          denom: "gintonic",
+        });
+      });
+    });
   });
 });

packages/stargate/src/queries/bank.ts

@@ -12,6 +12,7 @@ export interface BankExtension {
       readonly balance: (address: string, denom: string) => Promise<cosmos.ICoin>;
       readonly allBalances: (address: string) => Promise<cosmos.ICoin[]>;
       readonly totalSupply: () => Promise<cosmos.ICoin[]>;
+      readonly supplyOf: (denom: string) => Promise<cosmos.ICoin>;
     };
   };
 }
@@ -55,6 +56,11 @@ export function setupBankExtension(base: QueryClient): BankExtension {
           const { supply } = await queryService.totalSupply({});
           return supply.map(toObject);
         },
+        supplyOf: async (denom: string) => {
+          const { amount } = await queryService.supplyOf({ denom: denom });
+          assert(amount);
+          return toObject(amount);
+        },
       },
     },
   };

packages/stargate/types/queries/bank.d.ts

@@ -7,6 +7,7 @@ export interface BankExtension {
       readonly balance: (address: string, denom: string) => Promise<cosmos.ICoin>;
       readonly allBalances: (address: string) => Promise<cosmos.ICoin[]>;
       readonly totalSupply: () => Promise<cosmos.ICoin[]>;
+      readonly supplyOf: (denom: string) => Promise<cosmos.ICoin>;
     };
   };
 }