---
name: "Mojolicious::Plugin::AssetPack::Guides::Developing"
section: "3pm"
platform: "linux"
package: "libmojolicious-plugin-assetpack-perl"
version: "2.15-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Mojolicious::Plugin::AssetPack::Guides::Developing"
---

# Mojolicious::Plugin::AssetPack::Guides::Developing(3pm)

Developing with AssetPack

## NAME

Mojolicious::Plugin::AssetPack::Guides::Developing - Developing with AssetPack

## OVERVIEW

This guide will provide a setup for effective development with Mojolicious::Plugin::AssetPack.

## GUIDE

### Environment variables

It is possible to set environment variables to change the behavior of AssetPack:

- •

  MOJO\_ASSETPACK\_DEBUG

  Set this environment variable to get more debug to STDERR. Currently you can set it to a value between 0 and 3, where 3 provides the most debug.

- •

  MOJO\_ASSETPACK\_LAZY

  Set this environment variable if you want to delay processing the assets until they are requested. This can be very useful while developing when the assets are changed frequently.

### Faster development cycle

For a faster development cycle, you can use MOJO\_ASSETPACK\_LAZY. This environment variable will make AssetPack only rebuild the asset that is in use on the current web page.

```
  $ MOJO_ASSETPACK_LAZY=1 morbo myapp.pl
```

### Enforcing production assets

To be sure that production assets are built correctly, you can add a unit test like the one below. This is especially important if you are using "MOJO\_ASSETPACK\_LAZY".

```
  use Test::Mojo;
  use Test::More;
  $ENV{MOJO_MODE} = "production";
  my $t = Test::Mojo->new("MyApp");
  $t->get_ok("/")
    ->element_exists(q(head link[href$="/app.css"]))
    ->element_exists(q(body script[src$="/app.js"]));
  done_testing;
```

The `element_exists()` tests should match the topics defined when defining the different assets.

## Optional modules

There are some optional modules you might want to install:

- •

  CSS::Minifier::XS

  Used by Mojolicious::Plugin::AssetPack::Pipe::Css.

- •

  CSS::Sass

  Used by Mojolicious::Plugin::AssetPack::Pipe::Sass.

- •

  IO::Socket::SSL

  Required if you want to download assets served over SSL.

- •

  JavaScript::Minifier::XS

  Used by Mojolicious::Plugin::AssetPack::Pipe::JavaScript.

## SEE ALSO

Mojolicious::Plugin::AssetPack, Mojolicious::Plugin::AssetPack::Guides::Cookbook and Mojolicious::Plugin::AssetPack::Guides::Tutorial.