build: move ExampleNodeWallet to own entrypoint

No need to pollute the global API or bundle size with this.

src/example_node_wallet.ts

@@ -0,0 +1,27 @@
+import { Keypair, TransactionBuilder, hash } from '.'
+
+/**
+ * For use with {@link ContractClient} and {@link AssembledTransaction}.
+ * Implements `signTransaction` and `signAuthEntry` with signatures expected by
+ * those classes. This is useful for testing and maybe some simple Node
+ * applications. Feel free to use this as a starting point for your own
+ * Wallet/TransactionSigner implementation.
+ */
+export class ExampleNodeWallet {
+  constructor(
+    private keypair: Keypair,
+    private networkPassphrase: string,
+  ) {}
+
+  signTransaction = async (tx: string) => {
+    const t = TransactionBuilder.fromXDR(tx, this.networkPassphrase);
+    t.sign(this.keypair);
+    return t.toXDR();
+  }
+
+  signAuthEntry = async (entryXdr: string): Promise<string> => {
+    return this.keypair
+      .sign(hash(Buffer.from(entryXdr, "base64")))
+      .toString('base64')
+  }
+}

src/soroban/contract_client.ts

@@ -1,36 +1,8 @@
 import { AssembledTransaction } from '.'
-import { ContractSpec, Keypair, TransactionBuilder, hash, xdr } from '..'
+import { ContractSpec, xdr } from '..'
 
 export type XDR_BASE64 = string;
 
-/**
- * An example Wallet implementation that can be used for testing and
- * potentially some simple Node applications, which provides `signTransaction`
- * and `signAuthEntry` with the function signatures expected by ContractClient
- * & AssembledTransaction.
- *
- * Feel free to use this as a starting point for your own
- * Wallet/TransactionSigner implementation.
- */
-export class ExampleNodeWallet {
-  constructor(
-    private keypair: Keypair,
-    private networkPassphrase: string,
-  ) {}
-
-  signTransaction = async (tx: string) => {
-    const t = TransactionBuilder.fromXDR(tx, this.networkPassphrase);
-    t.sign(this.keypair);
-    return t.toXDR();
-  }
-
-  signAuthEntry = async (entryXdr: string): Promise<string> => {
-    return this.keypair
-      .sign(hash(Buffer.from(entryXdr, "base64")))
-      .toString('base64')
-  }
-}
-
 export type ContractClientOptions = {
   /**
    * The account to use for signing transactions. If not provided, a null

test/e2e/src/util.js

@@ -1,5 +1,6 @@
 const { spawnSync } = require('node:child_process')
-const { ContractSpec, Keypair, SorobanRpc } = require('../../..')
+const { ContractSpec, Keypair } = require('../../..')
+const { ExampleNodeWallet } = require('../../../lib/example_node_wallet')
 
 const contracts = {
   customTypes: {
@@ -53,7 +54,7 @@ async function clientFor(contract, { keypair = generateFundedKeypair(), contract
   }
 
   keypair = await keypair // eslint-disable-line no-param-reassign
-  const wallet = new SorobanRpc.ExampleNodeWallet(keypair, networkPassphrase)
+  const wallet = new ExampleNodeWallet(keypair, networkPassphrase)
 
   const spec = new ContractSpec(contracts[contract].xdr)