<!-- Public documentation export; not library implementation source. -->
# ISymbolValueFormatter

[Integration guide](https://docs.lumencharts.com/charting-library/reference/compatibility) · [Reference index](https://docs.lumencharts.com/charting-library/api/)

Public contract reference. This declaration describes types and callback shapes; availability is constrained by the linked integration guide and the runtime capability. Legacy product-specific fields are not a promise of implementation.

## format {#format}

```ts
format(price: number, signPositive?: boolean): string;
```

Use the type signature above and the integration guide for the owning capability.

| Parameter | Type | Required |
| --- | --- | --- |
| `price` | `number` | Yes |
| `signPositive` | `boolean` | No |

## formatChange {#formatchange}

```ts
formatChange?(
    currentPrice: number,
    prevPrice: number,
    signPositive?: boolean,
  ): string;
```

Use the type signature above and the integration guide for the owning capability.

| Parameter | Type | Required |
| --- | --- | --- |
| `currentPrice` | `number` | Yes |
| `prevPrice` | `number` | Yes |
| `signPositive` | `boolean` | No |

---
Documentation page: https://docs.lumencharts.com/charting-library/api/ISymbolValueFormatter