WordPress Laravel Mix Asset Class

LaravelMixAsset.php

<?php

declare(strict_types=1);

/**
 * Class LaravelMixAsset
 */
class LaravelMixAsset
{
    /**
     * @var string
     */
    protected string $path;

    /**
     * @var string
     */
    protected string $manifest_directory = '/dist';

    /**
     * @var null|string
     */
    protected ?string $manifest_path;

    /**
     * @var null|array
     */
    protected ?array $manifest;

    /**
     * LaravelMixAsset constructor.
     * @param string $path
     */
    public function __construct(string $path)
    {
        $this->path = static::before($path, '?');
        $this->manifest_path = $this->getManifestPath();
        $this->manifest = $this->getManifest();
    }

    /**
     * @return string
     */
    protected function getManifestPath(): string
    {
        if (empty($this->manifest_path)) {
            return get_theme_file_path($this->manifest_directory . '/mix-manifest.json');
        }

        return $this->manifest_path ?? '';
    }

    /**
     * @return array
     */
    protected function getManifest(): array
    {
        if (empty($this->manifest)) {
            return json_decode(file_get_contents($this->manifest_path), true);
        }

        return $this->manifest ?? [];
    }

    /**
     * Get asset URL
     *
     * @return string
     */
    public function uri(): string
    {
        if (!file_exists($this->manifest_path)) {
            return get_theme_file_uri($this->path);
        }

        $path = str_replace($this->manifest_directory, '', $this->path);
        $path = '/' . ltrim($path, '/');

        if (!array_key_exists($path, $this->manifest)) {
            return get_theme_file_uri($path);
        }

        $path = $this->manifest[$path];
        $path = ltrim($path, '/');

        $mixHotUri = $this->getMixHotUri($path);

        if (! empty($mixHotUri)) {
            return $mixHotUri;
        }

        return get_stylesheet_directory_uri() . trailingslashit($this->manifest_directory) . $path;
    }

    /**
     * Get asset dist path
     *
     * @return string
     */
    public function path(): string
    {
        if (! file_exists($this->manifest_path)) {
            return get_theme_file_path($this->path);
        }

        $path = str_replace($this->manifest_directory, '', $this->path);
        $path = ltrim($path, '/');

        return get_stylesheet_directory() . trailingslashit($this->manifest_directory) . $path;
    }

    /**
     * Check if asset exists
     *
     * @return bool
     */
    public function exists(): bool
    {
        return file_exists($this->path());
    }

    /**
     * Get the asset contents
     *
     * @return string
     */
    public function contents(): string
    {
        if (!$this->exists()) {
            return '';
        }

        return file_get_contents($this->path());
    }

    /**
     * Get the returned value of the asset
     *
     * @return mixed|false
     */
    public function get()
    {
        if (!$this->exists()) {
            return false;
        }

        return include $this->path();
    }


    /**
     * Get the portion of a string before the first occurrence of a given value.
     *
     * @param string $subject
     * @param string $search
     * @return string
     */
    public static function before(string $subject, string $search): string
    {
        if ($search === '') {
            return $subject;
        }

        $result = strstr($subject, $search, true);

        return $result === false ? $subject : $result;
    }

    /**
     * Return the remainder of a string after the first occurrence of a given value.
     *
     * @param string $subject
     * @param string $search
     * @return string
     */
    public static function after(string $subject, string $search): string
    {
        return $search === '' ? $subject : array_reverse(explode($search, $subject, 2))[0];
    }

    /**
     * Get the URI to a Mix hot module replacement server.
     *
     * @link https://laravel-mix.com/docs/hot-module-replacement
     *
     * @param string $path
     * @return string
     */
    protected function getMixHotUri(string $path): string
    {
        if (file_exists($path . '/hot')) {
            $url = rtrim(rtrim(file_get_contents($path . '/hot')), '/');

            return static::after($url, ':');
        }

        return '';
    }
}

usage.php

<?php

declare(strict_types=1);

include_once __DIR__ . '/includes/LaravelMixAsset.php';

/**
 * @param string $path
 * @return LaravelMixAsset
 */
function asset(string $path): LaravelMixAsset
{
    return new LaravelMixAsset($path);
}

/**
 * Enqueue styles
 */
add_action('wp_enqueue_scripts', function (): void {
    wp_enqueue_script('site/vendor.js', asset('scripts/vendor.js')->uri(), ['jquery'], null, true);
    wp_enqueue_script('site/app.js', asset('scripts/app.js')->uri(), ['jquery'], null, true);
    wp_add_inline_script('site/vendor.js', asset('scripts/manifest.js')->contents(), 'before');

    wp_enqueue_style('site/app.css', asset('styles/app.css')->uri());
}, 10);