Add initial PHPStan configuration

Author: swissspidy

lib/cli/Arguments.php

@@ -110,6 +110,8 @@ public function offsetGet($offset) {
 		if (isset($this->_parsed[$offset])) {
 			return $this->_parsed[$offset];
 		}
+
+		return null;
 	}
 
 	/**
@@ -302,6 +304,8 @@ public function getFlag($flag) {
 				return $settings;
 			}
 		}
+
+		return null;
 	}
 
 	public function getFlags() {
@@ -362,6 +366,8 @@ public function getOption($option) {
 				return $settings;
 			}
 		}
+
+		return null;
 	}
 
 	public function getOptions() {
@@ -388,7 +394,7 @@ public function isOption($argument) {
 	 * will use either the first long name given or the first name in the list
 	 * if a long name is not given.
 	 *
-	 * @return array
+	 * @return void
 	 * @throws arguments\InvalidArguments
 	 */
 	public function parse() {

lib/cli/arguments/Argument.php

@@ -16,6 +16,10 @@
 
 /**
  * Represents an Argument or a value and provides several helpers related to parsing an argument list.
+ *
+ * @property-read bool $isLong
+ * @property-read bool $isShort
+ * @property-read bool $isArgument
  */
 class Argument extends Memoize {
 	/**

lib/cli/table/Ascii.php

@@ -163,6 +163,7 @@ public function border() {
 	public function row( array $row ) {
 
 		$extra_row_count = 0;
+		$extra_rows      = [];
 
 		if ( count( $row ) > 0 ) {
 			$extra_rows = array_fill( 0, count( $row ), array() );

lib/cli/table/Tabular.php

@@ -23,8 +23,10 @@ class Tabular extends Renderer {
 	 * @return string  The formatted table row.
 	 */
 	public function row( array $row ) {
-		$rows   = [];
-		$output = '';
+		$rows        = [];
+		$output      = '';
+		$split_lines = [];
+		$col         = null;
 
 		foreach ( $row as $col => $value ) {
 			$value       = isset( $value ) ? (string) $value : '';

phpstan.neon.dist

@@ -0,0 +1,9 @@
+parameters:
+  level: 1
+  paths:
+    - lib
+  scanDirectories:
+    - vendor/wp-cli/wp-cli/php
+  scanFiles:
+    - vendor/php-stubs/wordpress-stubs/wordpress-stubs.php
+  treatPhpDocTypesAsCertain: false