Add TsUnsignedTransaction (wrapper type)

src/silentpayments.rs

@@ -1,11 +1,31 @@
 use std::collections::{HashMap, HashSet};
 
 use anyhow::{Error, Result};
+use serde::{Deserialize, Serialize};
+use tsify::Tsify;
 
 use rand::{thread_rng, Rng};
 use sp_client::bitcoin::{Amount, OutPoint, Transaction};
 use sp_client::{OwnedOutput, Recipient, SilentPaymentUnsignedTransaction, SpClient};
 
+#[derive(Debug, Serialize, Deserialize, PartialEq, Tsify)]
+#[tsify(from_wasm_abi)]
+pub struct TsUnsignedTransaction(SilentPaymentUnsignedTransaction); 
+
+impl TsUnsignedTransaction {
+    pub fn new(unsigned_tx: SilentPaymentUnsignedTransaction) -> Self {
+        Self(unsigned_tx)
+    }
+
+    pub fn as_inner(&self) -> &SilentPaymentUnsignedTransaction {
+        &self.0
+    }
+
+    pub fn to_inner(self) -> SilentPaymentUnsignedTransaction {
+        self.0
+    }
+}
+
 pub fn create_transaction(
     mandatory_inputs: Vec<OutPoint>,
     mut available_outpoints: HashMap<OutPoint, OwnedOutput>,