add steel example to close account (#208)

basics/close-account/steel/.gitignore

@@ -0,0 +1,2 @@
+target
+test-ledger

basics/close-account/steel/Cargo.toml

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+[workspace]
+members = ["api", "program"]
+resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "Apache-2.0"
+homepage = "https://github.com/solana-developers/program-examples"
+documentation = "https://github.com/solana-developers/program-examples"
+respository = "https://github.com/solana-developers/program-examples"
+readme = "./README.md"
+keywords = ["solana"]
+
+[workspace.dependencies]
+close-account-api = { path = "./api", version = "0.1.0" }
+bytemuck = "1.14"
+num_enum = "0.7"
+solana-program = "1.18"
+steel = "2.1.0"
+thiserror = "1.0"

basics/close-account/steel/README.md

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+# CloseAccount
+
+**CloseAccount** is a ...
+        
+## API
+- [`Consts`](api/src/consts.rs) – Program constants.
+- [`Error`](api/src/error.rs) – Custom program errors.
+- [`Event`](api/src/event.rs) – Custom program events.
+- [`Instruction`](api/src/instruction.rs) – Declared instructions.
+
+## Instructions
+- [`Hello`](program/src/hello.rs) – Hello ...
+
+## State
+- [`User`](api/src/state/user.rs) – User ...
+
+## Tests
+
+To run the test suit, use the Solana toolchain:
+```
+cargo test-sbf         
+```

basics/close-account/steel/api/Cargo.toml

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+[package]
+name = "close-account-api"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bytemuck.workspace = true
+jzon = "0.12.5"
+num_enum.workspace = true
+solana-program.workspace = true
+steel.workspace = true
+thiserror.workspace = true

basics/close-account/steel/api/src/error.rs

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+use steel::*;
+
+/// A [Result] type representing `Result<T, CloseAccountError>`
+pub type CloseAccountResult<T> = Result<T, CloseAccountError>;
+
+/// Error handling enum for this create
+#[derive(Debug, Error, Clone, Copy, PartialEq, Eq, IntoPrimitive)]
+#[repr(u32)]
+pub enum CloseAccountError {
+    /// A name can only be 64 bytes in length when converted to bytes
+    #[error("Invalid Name Length. The maximum length of the string is 64 bytes.")]
+    MaxNameLengthExceeded = 0,
+    /// Only UTF-8 String types are supported
+    #[error("Only UTF-8 String encoding is supported")]
+    OnlyUtf8IsSupported = 1,
+}
+
+error!(CloseAccountError);

basics/close-account/steel/api/src/instruction.rs

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+use steel::*;
+
+/// Used in generating the discriminats for instructions
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, TryFromPrimitive)]
+pub enum MyInstruction {
+    /// Create account discriminant represented by `0`
+    CreateAccount = 0,
+    /// Close account discriminant represented by `1`
+    CloseAccount = 1,
+}
+
+/// Create account struct with the name
+/// as an array of 64 bytes
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Pod, Zeroable)]
+pub struct CreateAccount(pub [u8; 64]);
+
+/// UsedClose Account
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Pod, Zeroable)]
+pub struct CloseAccount;
+
+instruction!(MyInstruction, CreateAccount);
+instruction!(MyInstruction, CloseAccount);

basics/close-account/steel/api/src/lib.rs

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+#![forbid(unsafe_code)]
+
+pub mod error;
+pub mod instruction;
+pub mod sdk;
+pub mod state;
+
+pub mod prelude {
+    pub use crate::error::*;
+    pub use crate::instruction::*;
+    pub use crate::sdk::*;
+    pub use crate::state::*;
+}
+
+use steel::*;
+
+// Set program id
+declare_id!("z7msBPQHDJjTvdQRoEcKyENgXDhSRYeHieN1ZMTqo35");

basics/close-account/steel/api/src/sdk.rs

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+use steel::*;
+
+use crate::prelude::*;
+
+/// Create an PDA and store a String in it
+pub fn create_account(signer: Pubkey, user: CreateAccount) -> Instruction {
+    Instruction {
+        program_id: crate::ID,
+        accounts: vec![
+            AccountMeta::new(signer, true),
+            AccountMeta::new(User::pda(signer).0, false),
+            AccountMeta::new_readonly(system_program::ID, false),
+        ],
+        data: user.to_bytes(),
+    }
+}
+
+/// Creates an instruction to close the account,
+/// in our case the PDA. The PDA address is derived from
+/// the `payer` public key
+pub fn close_account(signer: Pubkey) -> Instruction {
+    Instruction {
+        program_id: crate::ID,
+        accounts: vec![
+            AccountMeta::new(signer, true),
+            AccountMeta::new(User::pda(signer).0, false),
+            AccountMeta::new_readonly(system_program::ID, false),
+        ],
+        data: CloseAccount.to_bytes(),
+    }
+}

basics/close-account/steel/api/src/state/mod.rs

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+mod user;
+pub use user::*;

basics/close-account/steel/api/src/state/user.rs

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+use steel::*;
+
+use crate::error::{CloseAccountError, CloseAccountResult};
+
+/// An enum which is used to derive a discriminator for the user account.
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq, IntoPrimitive, TryFromPrimitive)]
+pub enum UserAccount {
+    /// The user is represented by a discriminator of `0`
+    User = 0,
+}
+
+/// The user Account structure which stores a
+/// `name` as bytes with max array length of u64 due to the
+/// requirement for memory alignment since 64 is a factor of 8.
+#[repr(C)]
+#[derive(Clone, Copy, Debug, PartialEq, Pod, Zeroable)]
+pub struct User {
+    /// The name string stored as bytes.
+    /// The `&str` is converted into bytes and copied upto
+    /// the length of the bytes, if the bytes are not 64, it
+    /// pads with zeroes upto 64, if it is more than 64 an error
+    /// is returned.
+    pub name: [u8; 64],
+}
+
+impl User {
+    /// Seed for the [User] used to in PDA generation
+    pub const SEED_PREFIX: &'static str = "USER";
+
+    /// Create a new user, convert the name into bytes
+    /// and add those bytes to a 64 byte array
+    pub fn new(name: &str) -> CloseAccountResult<Self> {
+        let name_bytes = name.as_bytes();
+
+        Self::check_length(name_bytes)?;
+
+        let mut name = [0u8; 64];
+        name[0..name_bytes.len()].copy_from_slice(name_bytes);
+
+        Ok(Self { name })
+    }
+
+    /// Converts the byte array into a UTF-8 [str]
+    /// using the `trim_end_matches("\0")` of [str] method
+    /// to remove padded zeroes if any. Padded zeroes are
+    /// represented by `\0`
+    pub fn to_string(&self) -> CloseAccountResult<String> {
+        let value =
+            core::str::from_utf8(&self.name).map_err(|_| CloseAccountError::OnlyUtf8IsSupported)?;
+
+        Ok(value.trim_end_matches("\0").to_string())
+    }
+
+    fn check_length(bytes: &[u8]) -> CloseAccountResult<()> {
+        if bytes.len() > 64 {
+            return Err(CloseAccountError::MaxNameLengthExceeded);
+        }
+
+        Ok(())
+    }
+
+    /// Generate a PDA from the [Self::SEED_PREFIX] constant
+    /// and the payer public key. This returns a tuple struct
+    /// ([Pubkey], [u8])
+    pub fn pda(payer: Pubkey) -> (Pubkey, u8) {
+        Pubkey::try_find_program_address(
+            &[Self::SEED_PREFIX.as_bytes(), payer.as_ref()],
+            &crate::id(),
+        )
+        .unwrap()
+    }
+}
+
+account!(UserAccount, User);

basics/close-account/steel/cicd.sh

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+#!/bin/bash
+
+# This script is for quick building & deploying of the program.
+# It also serves as a reference for the commands used for building & deploying Solana programs.
+# Run this bad boy with "bash cicd.sh" or "./cicd.sh"
+
+cargo build-sbf --manifest-path=./program/Cargo.toml --bpf-out-dir=./program/target/so
+solana program deploy ./program/target/so/program.so

basics/close-account/steel/package.json

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+{
+  "scripts": {
+    "test": "pnpm ts-mocha -p ./tests/tsconfig.test.json -t 1000000 ./tests/close-account.test.ts",
+    "build-and-test": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./tests/fixtures && pnpm test",
+    "build": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./target/so",
+    "deploy": "solana program deploy ./target/so/close_account_program.so"
+  },
+  "dependencies": {
+    "@coral-xyz/borsh": "^0.30.1",
+    "@solana/web3.js": "^1.35"
+  },
+  "devDependencies": {
+    "solana-bankrun": "^0.4.0",
+    "typescript": "^5.6.3",
+    "ts-mocha": "^10.0.0"
+  },
+  "packageManager": "pnpm@9.9.0+sha512.60c18acd138bff695d339be6ad13f7e936eea6745660d4cc4a776d5247c540d0edee1a563695c183a66eb917ef88f2b4feb1fc25f32a7adcadc7aaf3438e99c1"
+}

basics/close-account/steel/pnpm-lock.yaml

@@ -0,0 +1,1086 @@
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+
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+
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+      string-width: 4.2.3
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+    dev: true
+
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+    resolution: {integrity: sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==}
+    dev: true
+
+  /ws@7.5.9:
+    resolution: {integrity: sha512-F+P9Jil7UiSKSkppIiD94dN07AwvFixvLIj1Og1Rl9GGMuNipJnV9JzjD6XuqmAeiswGvUmNLjr5cFuXwNS77Q==}
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+    peerDependencies:
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+      utf-8-validate: ^5.0.2
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+      utf-8-validate:
+        optional: true
+
+  /ws@8.17.0(bufferutil@4.0.8)(utf-8-validate@5.0.10):
+    resolution: {integrity: sha512-uJq6108EgZMAl20KagGkzCKfMEjxmKvZHG7Tlq0Z6nOky7YF7aq4mOx6xK8TJ/i1LeK4Qus7INktacctDgY8Ow==}
+    engines: {node: '>=10.0.0'}
+    peerDependencies:
+      bufferutil: ^4.0.1
+      utf-8-validate: '>=5.0.2'
+    peerDependenciesMeta:
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+        optional: true
+      utf-8-validate:
+        optional: true
+    dependencies:
+      bufferutil: 4.0.8
+      utf-8-validate: 5.0.10
+
+  /y18n@5.0.8:
+    resolution: {integrity: sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==}
+    engines: {node: '>=10'}
+    dev: true
+
+  /yargs-parser@20.2.4:
+    resolution: {integrity: sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==}
+    engines: {node: '>=10'}
+    dev: true
+
+  /yargs-unparser@2.0.0:
+    resolution: {integrity: sha512-7pRTIA9Qc1caZ0bZ6RYRGbHJthJWuakf+WmHK0rVeLkNrrGhfoabBNdue6kdINI6r4if7ocq9aD/n7xwKOdzOA==}
+    engines: {node: '>=10'}
+    dependencies:
+      camelcase: 6.3.0
+      decamelize: 4.0.0
+      flat: 5.0.2
+      is-plain-obj: 2.1.0
+    dev: true
+
+  /yargs@16.2.0:
+    resolution: {integrity: sha512-D1mvvtDG0L5ft/jGWkLpG1+m0eQxOfaBvTNELraWj22wSVUMWxZUvYgJYcKh6jGGIkJFhH4IZPQhR4TKpc8mBw==}
+    engines: {node: '>=10'}
+    dependencies:
+      cliui: 7.0.4
+      escalade: 3.1.2
+      get-caller-file: 2.0.5
+      require-directory: 2.1.1
+      string-width: 4.2.3
+      y18n: 5.0.8
+      yargs-parser: 20.2.4
+    dev: true
+
+  /yn@2.0.0:
+    resolution: {integrity: sha512-uTv8J/wiWTgUTg+9vLTi//leUl5vDQS6uii/emeTb2ssY7vl6QWf2fFbIIGjnhjvbdKlU0ed7QPgY1htTC86jQ==}
+    engines: {node: '>=4'}
+    dev: true
+
+  /yocto-queue@0.1.0:
+    resolution: {integrity: sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==}
+    engines: {node: '>=10'}
+    dev: true

basics/close-account/steel/program/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "close-account-program"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+
+[dependencies]
+close-account-api.workspace = true
+solana-program.workspace = true
+steel.workspace = true
+
+[dev-dependencies]
+bs64 = "0.1.2"
+rand = "0.8.5"
+solana-program-test = "1.18"
+solana-sdk = "1.18"
+tokio = { version = "1.35", features = ["full"] }

basics/close-account/steel/program/src/close_user.rs

@@ -0,0 +1,12 @@
+use solana_program::{account_info::AccountInfo, entrypoint::ProgramResult};
+use steel::{ProgramError, *};
+
+pub fn close_user(accounts: &[AccountInfo]) -> ProgramResult {
+    let [payer, target_account, _] = accounts else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+
+    payer.is_signer()?;
+
+    steel::close_account(target_account, payer)
+}

basics/close-account/steel/program/src/create_user.rs

@@ -0,0 +1,33 @@
+use solana_program::{account_info::AccountInfo, entrypoint::ProgramResult};
+
+use close_account_api::prelude::{CreateAccount, User};
+use steel::{create_account, system_program, AccountInfoValidation, AsAccount, ProgramError};
+
+pub fn create_user(accounts: &[AccountInfo], data: &[u8]) -> ProgramResult {
+    let value = CreateAccount::try_from_bytes(data)?;
+
+    let [payer, target_account, system_program] = accounts else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+
+    payer.is_signer()?;
+
+    target_account.is_empty()?.is_writable()?.has_seeds(
+        &[User::SEED_PREFIX.as_bytes(), payer.key.as_ref()],
+        &close_account_api::ID,
+    )?;
+    system_program.is_program(&system_program::ID)?;
+
+    create_account::<User>(
+        target_account,
+        system_program,
+        payer,
+        &close_account_api::ID,
+        &[User::SEED_PREFIX.as_bytes(), payer.key.as_ref()],
+    )?;
+
+    let user = target_account.as_account_mut::<User>(&close_account_api::ID)?;
+    user.name = value.0;
+
+    Ok(())
+}

basics/close-account/steel/program/src/lib.rs

@@ -0,0 +1,25 @@
+use close_account_api::prelude::*;
+use steel::*;
+
+mod create_user;
+pub(crate) use create_user::*;
+
+mod close_user;
+pub(crate) use close_user::*;
+
+pub fn process_instruction(
+    program_id: &Pubkey,
+    accounts: &[AccountInfo],
+    data: &[u8],
+) -> ProgramResult {
+    let (ix, data) = parse_instruction(&close_account_api::ID, program_id, data)?;
+
+    match ix {
+        MyInstruction::CreateAccount => create_user(accounts, data)?,
+        MyInstruction::CloseAccount => close_user(accounts)?,
+    }
+
+    Ok(())
+}
+
+entrypoint!(process_instruction);

basics/close-account/steel/program/tests/test.rs

@@ -0,0 +1,48 @@
+use close_account_api::prelude::*;
+use solana_program::hash::Hash;
+use solana_program_test::{processor, BanksClient, ProgramTest};
+use solana_sdk::{signature::Keypair, signer::Signer, transaction::Transaction};
+use steel::*;
+
+async fn setup() -> (BanksClient, Keypair, Hash) {
+    let mut program_test = ProgramTest::new(
+        "close-account",
+        close_account_api::ID,
+        processor!(close_account_program::process_instruction),
+    );
+    program_test.prefer_bpf(true);
+    program_test.start().await
+}
+
+#[tokio::test]
+async fn run_test() {
+    // Setup test
+    let (mut banks, payer, blockhash) = setup().await;
+
+    let name = "foobarbaz";
+    let account = User::new(name).unwrap();
+
+    // Submit initialize transaction.
+    let ix = close_account_api::sdk::create_account(payer.pubkey(), CreateAccount(account.name));
+    let tx = Transaction::new_signed_with_payer(&[ix], Some(&payer.pubkey()), &[&payer], blockhash);
+    let res = banks.process_transaction(tx).await;
+    assert!(res.is_ok());
+
+    let user_pda = User::pda(payer.pubkey()).0;
+    let pda_account = banks.get_account(user_pda).await.unwrap().unwrap();
+    let name_deser = User::try_from_bytes(&pda_account.data).unwrap();
+
+    assert_eq!(pda_account.owner, close_account_api::ID);
+    assert_eq!(name_deser.to_string().unwrap().as_str(), name);
+
+    // Test Closing an Account
+    // Submit initialize transaction.
+    let ix = close_account_api::sdk::close_account(payer.pubkey());
+    let tx = Transaction::new_signed_with_payer(&[ix], Some(&payer.pubkey()), &[&payer], blockhash);
+    let res = banks.process_transaction(tx).await;
+    assert!(res.is_ok());
+
+    let pda_account = banks.get_account(user_pda).await.unwrap();
+
+    assert!(pda_account.is_none());
+}

basics/close-account/steel/tests/close-account.test.ts

@@ -0,0 +1,35 @@
+import { describe, test } from 'node:test';
+import { PublicKey, Transaction } from '@solana/web3.js';
+import { start } from 'solana-bankrun';
+import { createCreateUserInstruction, createCloseUserInstruction } from '../ts';
+
+describe('Close Account!', async () => {
+  const PROGRAM_ID = new PublicKey('z7msBPQHDJjTvdQRoEcKyENgXDhSRYeHieN1ZMTqo35');
+  const context = await start([{ name: 'close_account_program', programId: PROGRAM_ID }], []);
+  const client = context.banksClient;
+  const payer = context.payer;
+
+  const testAccountPublicKey = PublicKey.findProgramAddressSync([Buffer.from('USER'), payer.publicKey.toBuffer()], PROGRAM_ID)[0];
+
+  test('Create the account', async () => {
+    const blockhash = context.lastBlockhash;
+    const ix = createCreateUserInstruction(payer.publicKey, testAccountPublicKey, PROGRAM_ID, 'Jacob');
+
+    const tx = new Transaction();
+    tx.recentBlockhash = blockhash;
+    tx.add(ix).sign(payer);
+
+    await client.processTransaction(tx);
+  });
+
+  test('Close the account', async () => {
+    const blockhash = context.lastBlockhash;
+
+    const ix = createCloseUserInstruction(payer.publicKey, testAccountPublicKey, PROGRAM_ID);
+    const tx = new Transaction();
+    tx.recentBlockhash = blockhash;
+    tx.add(ix).sign(payer);
+
+    await client.processTransaction(tx);
+  });
+});

basics/close-account/steel/tests/tsconfig.test.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "types": ["mocha", "chai"],
+    "typeRoots": ["./node_modules/@types"],
+    "lib": ["es2015"],
+    "module": "commonjs",
+    "target": "es6",
+    "esModuleInterop": true
+  }
+}

basics/close-account/steel/ts/index.ts

@@ -0,0 +1 @@
+export * from './instructions';

basics/close-account/steel/ts/instructions/close.ts

@@ -0,0 +1,42 @@
+import { Buffer } from 'node:buffer';
+import { type PublicKey, SystemProgram, TransactionInstruction } from '@solana/web3.js';
+import { closeAccountSchema, MyInstruction } from '.';
+
+export class Close {
+  instruction: MyInstruction;
+
+  constructor(props: { instruction: MyInstruction }) {
+    this.instruction = props.instruction;
+  }
+
+  toBuffer() {
+    const buffer = Buffer.alloc(1000);
+
+    closeAccountSchema.encode(
+      {
+        CloseUser: '',
+      },
+      buffer,
+    );
+
+    return buffer.subarray(0, closeAccountSchema.getSpan(buffer));
+  }
+}
+
+export function createCloseUserInstruction(payer: PublicKey, target: PublicKey, programId: PublicKey): TransactionInstruction {
+  const instructionObject = new Close({
+    instruction: MyInstruction.CloseUser,
+  });
+
+  const ix = new TransactionInstruction({
+    keys: [
+      { pubkey: payer, isSigner: true, isWritable: true },
+      { pubkey: target, isSigner: false, isWritable: true },
+      { pubkey: SystemProgram.programId, isSigner: false, isWritable: false },
+    ],
+    programId: programId,
+    data: instructionObject.toBuffer(),
+  });
+
+  return ix;
+}

basics/close-account/steel/ts/instructions/create.ts

@@ -0,0 +1,55 @@
+import { Buffer } from 'node:buffer';
+import { PublicKey, SystemProgram, TransactionInstruction } from '@solana/web3.js';
+import { closeAccountSchema, MyInstruction } from '.';
+
+export class Create {
+  instruction: MyInstruction;
+  name: String;
+
+  constructor(props: { instruction: MyInstruction; name: string }) {
+    this.instruction = props.instruction;
+    this.name = props.name;
+  }
+
+  toBuffer() {
+    const textBuffer = Buffer.alloc(64);
+    let buffer = Buffer.alloc(1000);
+
+    textBuffer.write('foobarbaz', 0, 'utf-8');
+
+    closeAccountSchema.encode(
+      {
+        CreateUser: Array.from(textBuffer),
+      },
+      buffer,
+    );
+
+    return buffer.subarray(0, closeAccountSchema.getSpan(buffer));
+  }
+}
+
+export function createCreateUserInstruction(payer: PublicKey, target: PublicKey, programId: PublicKey, name: string): TransactionInstruction {
+  const instructionObject = new Create({
+    instruction: MyInstruction.CreateUser,
+    name,
+  });
+
+  const seed = 'USER';
+  const seedBytes = new Uint8Array(seed.split('').map((char) => char.charCodeAt(0)));
+
+  const [pda, _] = PublicKey.findProgramAddressSync([seedBytes, payer.toBuffer()], programId);
+
+  const data = instructionObject.toBuffer();
+
+  const ix = new TransactionInstruction({
+    keys: [
+      { pubkey: payer, isSigner: true, isWritable: true },
+      { pubkey: pda, isSigner: false, isWritable: true },
+      { pubkey: SystemProgram.programId, isSigner: false, isWritable: false },
+    ],
+    programId: programId,
+    data,
+  });
+
+  return ix;
+}

basics/close-account/steel/ts/instructions/index.ts

@@ -0,0 +1,11 @@
+export * from './create';
+export * from './close';
+
+import * as borsh from '@coral-xyz/borsh';
+
+export enum MyInstruction {
+  CreateUser = 0,
+  CloseUser = 1,
+}
+
+export const closeAccountSchema = borsh.rustEnum([borsh.struct([borsh.array(borsh.u8(), 64, 'name')], 'CreateUser'), borsh.struct([], 'CloseUser')]);

package.json

@@ -33,6 +33,5 @@
     "anchor-bankrun": "^0.4.0",
     "chai": "^5.1.1",
     "solana-bankrun": "^0.3.0"
-  },
-  "packageManager": "pnpm@9.8.0+sha512.8e4c3550fb500e808dbc30bb0ce4dd1eb614e30b1c55245f211591ec2cdf9c611cabd34e1364b42f564bd54b3945ed0f49d61d1bbf2ec9bd74b866fcdc723276"
+  }
 }