---
title: Config Options for elm
sidebar_label: elm
---

| Option | Description | Values | Default |
| ------ | ----------- | ------ | ------- |
|elmVersion|Elm version: 0.18, 0.19|<dl><dt>**0.19**</dt><dd>Elm 0.19</dd><dt>**0.18**</dt><dd>Elm 0.18</dd><dl>|0.19|
|elmPrefixCustomTypeVariants|Prefix custom type variants| |false|
|elmEnableCustomBasePaths|Enable setting the base path for each request| |false|
|elmEnableHttpRequestTrackers|Enable adding a tracker to each http request| |false|

## IMPORT MAPPING

| Type/Alias | Imports |
| ---------- | ------- |


## INSTANTIATION TYPES

| Type/Alias | Instantiated By |
| ---------- | --------------- |
|array|List|
|map|Dict|


## LANGUAGE PRIMITIVES

<ul data-columns="2" style="list-style-type: disc;-webkit-columns:2;-moz-columns:2;columns:2;-moz-column-fill:auto;column-fill:auto"><li>Float</li>
<li>Bool</li>
<li>Dict</li>
<li>List</li>
<li>String</li>
<li>Int</li>
</ul>

## RESERVED WORDS

<ul data-columns="2" style="list-style-type: disc;-webkit-columns:2;-moz-columns:2;columns:2;-moz-column-fill:auto;column-fill:auto"><li>import</li>
<li>in</li>
<li>module</li>
<li>then</li>
<li>type</li>
<li>exposing</li>
<li>as</li>
<li>port</li>
<li>else</li>
<li>of</li>
<li>let</li>
<li>where</li>
<li>if</li>
<li>case</li>
</ul>