draft: included a new createAssetId fn in receipt; added documentation

apps/docs/src/guide/types/native-parameters.md

@@ -74,3 +74,11 @@ To pass an `AssetId` as an input parameter to a Sway program, you can define the
 For a Sway program that returns an `AssetId` type, you can convert the returned value to a `string` as shown below:
 
 <<< @/../../docs-snippets/src/guide/types/contract-types.test.ts#asset-id-output
+
+### `CreateAssetId`
+
+To create an `AssetId` from a `contractId` and `subId`. You can create the `assetId` as shown below:
+
+```
+ const assetId = createAssetId(contractId, subId);
+```

packages/transactions/src/coders/receipt.ts

@@ -774,6 +774,18 @@ export const getMintedAssetId = (contractId: string, subId: string): string => {
   return sha256(concat([contractIdBytes, subIdBytes]));
 };
 
+type AssetIdInput = {
+  bits: string;
+};
+
+export const createAssetId = (contractId: string, subId: string): AssetIdInput => {
+  const bits = getMintedAssetId(contractId, subId);
+  const assetId: AssetIdInput = {
+    bits,
+  };
+  return assetId;
+};
+
 export class ReceiptMintCoder extends Coder<ReceiptMint, ReceiptMint> {
   constructor() {
     super('ReceiptMint', 'struct ReceiptMint', 0);