# TransactionTarget

Specifies where a transaction executes - natively on the platform, in a stored contract, or via an inline WASM session.

## Import

```ts
import {
  TransactionTarget,
  StoredTarget,
  SessionTarget,
  TransactionInvocationTarget,
  TransactionRuntime,
} from 'casper-js-sdk';
```

## Classes

### `TransactionTarget`

A discriminated union - exactly one variant is set.

| Property | Type | Description |
|---|---|---|
| `native?` | `object` | Native target (mint/auction operations) |
| `stored?` | `StoredTarget` | Call a stored contract |
| `session?` | `SessionTarget` | Execute inline WASM |

#### Methods

```ts
target.toBytes(): Uint8Array
target.toJSON(): any
TransactionTarget.fromJSON(json: any): TransactionTarget
TransactionTarget.newTransactionTargetFromSession(session: ExecutableDeployItem): TransactionTarget
```

### `StoredTarget`

Calls a contract already deployed on-chain.

| Property | Type | Description |
|---|---|---|
| `id` | `TransactionInvocationTarget` | How to identify the contract |
| `runtime` | `TransactionRuntime` | Execution runtime (VmCasperV1 or VmCasperV2) |

#### Methods

```ts
target.toBytes(): Uint8Array
```

### `SessionTarget`

Executes inline WASM bytecode.

| Property | Type | Description |
|---|---|---|
| `moduleBytes` | `Uint8Array` | WASM bytecode |
| `runtime` | `TransactionRuntime` | Execution runtime |
| `isInstallUpgrade` | `boolean` | Whether this is a contract install or upgrade |

#### Methods

```ts
target.toBytes(): Uint8Array
```

### `TransactionInvocationTarget`

Identifies the contract to call. Exactly one variant is set.

| Property | Type | Description |
|---|---|---|
| `byHash?` | `Hash` | Contract hash |
| `byName?` | `string` | Named key |
| `byPackageHash?` | `ByPackageHashInvocationTarget` | Package hash with optional version |
| `byPackageName?` | `ByPackageNameInvocationTarget` | Package named key with optional version |

#### Methods

```ts
target.toBytes(): Uint8Array
TransactionInvocationTarget.fromBytes(bytes: Uint8Array): TransactionInvocationTarget
```

### `TransactionRuntime`

| Value | Description |
|---|---|
| `VmCasperV1` | Casper VM version 1 |
| `VmCasperV2` | Casper VM version 2 |

#### Static Methods

```ts
TransactionRuntime.vmCasperV1(): TransactionRuntime
TransactionRuntime.vmCasperV2(): TransactionRuntime
TransactionRuntime.fromJSON(json: string): TransactionRuntime
```

#### Methods

```ts
runtime.toJSON(): string
runtime.toBytes(): Uint8Array
```

## Usage

```ts
import {
  TransactionTarget,
  StoredTarget,
  TransactionInvocationTarget,
  TransactionRuntime,
} from 'casper-js-sdk';

// Native target (for staking/mint operations)
const native = new TransactionTarget({});

// Call stored contract by hash
const invocationTarget = new TransactionInvocationTarget();
invocationTarget.byHash = 'contract-hash-abc123...';

const stored = new TransactionTarget(
  undefined,
  new StoredTarget(invocationTarget, TransactionRuntime.vmCasperV1())
);
```

:::tip
Transaction builders handle target construction automatically. Use `ContractCallBuilder` for contract calls and `SessionBuilder` for WASM sessions.
:::

## See Also

- [`TransactionV1Payload`](/types/transaction-v1-payload) - Contains `target`
- [`ContractCallBuilder`](/builders/ContractCallBuilder) - Sets `StoredTarget`
- [`SessionBuilder`](/builders/SessionBuilder) - Sets `SessionTarget`