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  3. Extending Twig in Plugin, getting "Unknown filter."
huna
huna

I created a Plugin to extend my local project's Twig in /plugins/huna/wpasset

<?php namespace Huna\WpAsset;

use System\Classes\PluginBase;

class Plugin extends PluginBase
{
    public $elevated = true;
    private $manifest;

    /**
     * Returns information about this plugin.
     *
     * @return array
     */
    public function pluginDetails() {
        return [
            'name'        => 'wp assets',
            'description' => 'wp assets',
            'author'      => 'huna',
        ];
    }

    /**
     * Register markup filters and functions to be used in Twig
     *
     * @return array
     */
    public function registerMarkupTags() {
        return [
            'filters' => [
                'wpasset' => [$this, 'getWpAsset'],
            ],
        ];
    }

    public function getWpAsset($assetname) {
        $this->manifest = file_get_contents('manifest.json');
        $this->manifest = json_decode($this->manifest, true);
        if (!isset($this->manifest[$assetname])) return $assetname;
        return $this->manifest[$assetname]['src'];
    }

}

To use that in markup, in default.htm

description = "Default layout"
==
<!DOCTYPE html>
<html>
<head>
    {% partial 'site/meta' %}
</head>

<body>

    <section id="layout-content">
        {% page %}
    </section>

    <script src="{{ 'main.js'|wpasset }}"></script>

</body>
</html>

When I access the homepage, I get this error

We're sorry, but an unhandled error occurred. Please see the details below.
Unknown "wpasset" filter.

What am I missing so that the filter is recognized and I can use that syntax in my templates?

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