fix: catchup to upstream loader changes

web3.js/src/loader.js

@@ -2,7 +2,7 @@
 
 import * as BufferLayout from 'buffer-layout';
 
-import {PublicKey, Transaction} from '.';
+import {PublicKey, SystemProgram, Transaction} from '.';
 import {sendAndConfirmTransaction} from './util/send-and-confirm-transaction';
 import type {Account, Connection} from '.';
 
@@ -85,12 +85,15 @@ export class Loader {
       userdata,
     );
 
-    const transaction = new Transaction({
+    let transaction = new Transaction({
       fee: 0,
       keys: [program.publicKey],
       programId: this.programId,
       userdata,
     });
     await sendAndConfirmTransaction(this.connection, program, transaction);
+
+    transaction = SystemProgram.spawn(program.publicKey);
+    await sendAndConfirmTransaction(this.connection, program, transaction);
   }
 }

web3.js/src/system-program.js

@@ -105,4 +105,28 @@ export class SystemProgram {
       userdata,
     });
   }
+
+  /**
+   * Spawn a new program from an account
+   */
+  static spawn(programId: PublicKey): Transaction {
+    const userdataLayout = BufferLayout.struct([
+      BufferLayout.u32('instruction'),
+    ]);
+
+    const userdata = Buffer.alloc(userdataLayout.span);
+    userdataLayout.encode(
+      {
+        instruction: 3, // Spawn instruction
+      },
+      userdata,
+    );
+
+    return new Transaction({
+      fee: 0,
+      keys: [programId],
+      programId: SystemProgram.programId,
+      userdata,
+    });
+  }
 }