[SDK] add two new utilities toEther and toWei (#421)

Co-authored-by: Nacho Iacovino <50103937+nachoiacovino@users.noreply.github.com>
Co-authored-by: Jonas Daniels <jonas.daniels@outlook.com>

.changeset/fluffy-toys-warn.md

@@ -0,0 +1,5 @@
+---
+"@thirdweb-dev/sdk": patch
+---
+
+Add new utilities to parse/format currencies. `toEther` & `toWei` as default 18 decimal and `toUnits` & `toDisplayValue` in case of different numbers of decimals.

packages/sdk/src/evm/common/currency.ts

@@ -192,3 +192,19 @@ export async function normalizeAmount(
   const decimals = await contractWrapper.readContract.decimals();
   return utils.parseUnits(AmountSchema.parse(amount), decimals);
 }
+
+export function toEther(amount: BigNumberish): string {
+  return utils.formatEther(amount);
+}
+
+export function toWei(amount: Amount): BigNumber {
+  return utils.parseEther(AmountSchema.parse(amount));
+}
+
+export function toUnits(amount: Amount, decimals: BigNumberish): BigNumber {
+  return utils.parseUnits(AmountSchema.parse(amount), decimals);
+}
+
+export function toDisplayValue(amount: BigNumberish, decimals: BigNumberish): string {
+  return utils.formatUnits(amount, decimals);
+}