> ## Documentation Index
> Fetch the complete documentation index at: https://docs.exponent.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# Collect Emission

> Low-level instruction to collect emission rewards from a yield position

# createCollectEmissionInstruction

Builds a raw instruction to collect emission rewards from a yield position. Each vault can have multiple emission tokens, identified by their index.

## Usage

```typescript theme={null}
import { createCollectEmissionInstruction, amount } from "@exponent-labs/exponent-sdk/client/core";
import { PublicKey } from "@solana/web3.js";

const ix = createCollectEmissionInstruction(
  {
    owner: wallet.publicKey,
    vault: vaultAddress,
    position: userYieldPositionPda,
    syProgram: syProgramId,
    authority: vaultAuthority,
    emissionEscrow: emissionEscrowAccount,
    emissionDst: userEmissionTokenAccount,
    addressLookupTable: vaultLookupTable,
    treasuryEmissionTokenAccount: treasuryEmissionAccount,
    tokenProgram: TOKEN_PROGRAM_ID,
    eventAuthority: eventAuthorityPda,
    program: EXPONENT_CORE_PROGRAM_ID,
  },
  {
    index: 0, // First emission token
    amount: amount("All"),
  }
);
```

## Accounts

| Name                           | Type        | Signer | Writable | Description                            |
| ------------------------------ | ----------- | ------ | -------- | -------------------------------------- |
| `owner`                        | `PublicKey` | Yes    | Yes      | The yield position owner               |
| `vault`                        | `PublicKey` | No     | Yes      | Vault account                          |
| `position`                     | `PublicKey` | No     | Yes      | User's yield position PDA              |
| `syProgram`                    | `PublicKey` | No     | No       | SY program                             |
| `authority`                    | `PublicKey` | No     | No       | Vault authority PDA                    |
| `emissionEscrow`               | `PublicKey` | No     | Yes      | Emission token escrow account          |
| `emissionDst`                  | `PublicKey` | No     | Yes      | Destination emission token account     |
| `addressLookupTable`           | `PublicKey` | No     | No       | Vault address lookup table             |
| `treasuryEmissionTokenAccount` | `PublicKey` | No     | Yes      | Treasury emission token account (fees) |
| `tokenProgram`                 | `PublicKey` | No     | No       | SPL Token program                      |
| `eventAuthority`               | `PublicKey` | No     | No       | Event authority PDA                    |
| `program`                      | `PublicKey` | No     | No       | Exponent Core program                  |

## Args

| Name     | Type     | Description                                                      |
| -------- | -------- | ---------------------------------------------------------------- |
| `index`  | `number` | Emission index (0-based, corresponding to vault's emission list) |
| `amount` | `Amount` | Amount to collect: `amount("All")` or `amount("Some", [value])`  |

### Amount Helper

```typescript theme={null}
import { amount } from "@exponent-labs/exponent-sdk/client/core";

amount("All")                // collect everything available
amount("Some", [500_000n])   // collect a specific amount
```

## Returns

`TransactionInstruction` — a transaction instruction ready to be added to a transaction.