avoid phpstan error: the type of the expression could not be determined

Author: clemzarch

src/Builder/ConditionalMapper.php

@@ -35,6 +35,8 @@ private function compileConditions(array $alternatives): Node
 
         /** @var Builder $builder */
         [$condition, $builder] = array_shift($alternatives);
+        /** @var Node\Stmt\Expression $expression */
+        $expression = $parser->parse('<?php '.$this->interpreter->compile($condition, ['input', 'output']).';')[0];
 
         return new Node\Expr\New_(
             new Node\Stmt\Class_(
@@ -106,7 +108,7 @@ function ($alternative) {
                                 ],
                                 'stmts' => [
                                     new Node\Stmt\If_(
-                                        cond: $parser->parse('<?php '.$this->interpreter->compile($condition, ['input', 'output']).';')[0]->expr,
+                                        cond: $expression->expr,
                                         subNodes: [
                                             'stmts' => [
                                                 new Node\Stmt\Return_(
@@ -130,11 +132,11 @@ function ($alternative) {
                                                 ),
                                             ],
                                             'elseifs' => array_map(
-                                                function ($alternative, $index) use ($parser) {
+                                                function ($alternative, $index) use ($expression) {
                                                     [$condition, $repository] = $alternative;
 
                                                     return new Node\Stmt\ElseIf_(
-                                                        cond: $parser->parse('<?php '.$this->interpreter->compile($condition, ['input', 'output']).';')[0]->expr,
+                                                        cond: $expression->expr,
                                                         stmts: [
                                                             new Node\Stmt\Return_(
                                                                 new Node\Expr\FuncCall(