---
title: "ExpressionSpecificationDefinition | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Type Alias ExpressionSpecificationDefinition

type ExpressionSpecificationDefinition \= {  
    [interpolated](#interpolated): boolean;  
    [parameters](#parameters): [ExpressionParameters](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ExpressionParameters/);  
}

##### Index

### Properties[](#properties)

[interpolated](#interpolated) [parameters](#parameters)

## Properties[](#properties-1)

### interpolated[](#interpolated)

interpolated: boolean

### parameters[](#parameters)

parameters: [ExpressionParameters](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.ExpressionParameters/)