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wp-content/plugins/wp-smushit/core/class-smush-file.php

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+<?php
+
+namespace Smush\Core;
+
+class Smush_File {
+	/**
+	 * @var array
+	 */
+	private $supported_mime_types = array(
+		'image/jpg',
+		'image/jpeg',
+		'image/x-citrix-jpeg',
+		'image/gif',
+		'image/png',
+		'image/x-png',
+	);
+
+	public function get_supported_mime_types() {
+		return $this->supported_mime_types;
+	}
+}