assetsmanifest-plugin/classes/ManifestReader.php

<?php namespace Wpstudio\AssetsManifest\Classes;

class ManifestReader
{
    private $manifest = null;

    public function __construct(string $manifestPath)
    {
        $this->manifest = json_decode(file_get_contents($manifestPath));
    }

    public function get($assetName)
    {
        return $this->manifest->$assetName;
    }
}