Changes:

- added type-hints
- added returned type-hints in interface (I checked all)

src/Util/EMailer/MailBuilder.php

@@ -164,7 +164,7 @@ abstract class MailBuilder
 	 *
 	 * @return string[][]
 	 */
-	public function getHeaders()
+	public function getHeaders(): array
 	{
 		return $this->headers;
 	}
@@ -182,7 +182,7 @@ abstract class MailBuilder
 	 * @param string[][] $headers
 	 * @return $this
 	 */
-	public function withHeaders(array $headers)
+	public function withHeaders(array $headers): MailBuilder
 	{
 		$this->headers = $headers;
 

src/Util/Mimetype.php

@@ -29,7 +29,7 @@ class Mimetype
 	 * @param string $filename filename
 	 * @return mixed array or string
 	 */
-	public static function getContentType($filename)
+	public static function getContentType(string $filename)
 	{
 		$mime_types = [
 	

src/Util/ParseUrl.php

@@ -59,7 +59,7 @@ class ParseUrl
 	 * @param string $accept content-type to accept
 	 * @return array content type
 	 */
-	public static function getContentType(string $url, string $accept = HttpClientAccept::DEFAULT)
+	public static function getContentType(string $url, string $accept = HttpClientAccept::DEFAULT): array
 	{
 		$curlResult = DI::httpClient()->head($url, [HttpClientOptions::ACCEPT_CONTENT => $accept]);