allow vendord

vendor/maatwebsite/excel/src/Middleware/CellMiddleware.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Maatwebsite\Excel\Middleware;
+
+abstract class CellMiddleware
+{
+    /**
+     * @param  mixed  $value
+     * @return mixed
+     */
+    abstract public function __invoke($value, callable $next);
+}

vendor/maatwebsite/excel/src/Middleware/ConvertEmptyCellValuesToNull.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Maatwebsite\Excel\Middleware;
+
+class ConvertEmptyCellValuesToNull extends CellMiddleware
+{
+    /**
+     * @param  mixed  $value
+     * @return mixed
+     */
+    public function __invoke($value, callable $next)
+    {
+        return $next(
+            $value === '' ? null : $value
+        );
+    }
+}

vendor/maatwebsite/excel/src/Middleware/TrimCellValue.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Maatwebsite\Excel\Middleware;
+
+class TrimCellValue extends CellMiddleware
+{
+    /**
+     * @param  mixed  $value
+     * @return mixed
+     */
+    public function __invoke($value, callable $next)
+    {
+        if (!is_string($value)) {
+            return $next($value);
+        }
+
+        // Remove whitespace, BOM and zero width spaces.
+        $cleaned = preg_replace('~^[\s\x{FEFF}\x{200B}]+|[\s\x{FEFF}\x{200B}]+$~u', '', $value) ?? trim($value);
+
+        return $next($cleaned);
+    }
+}