Add a rector to replace known defined()s with bool

E.g. if you have
`define('STATIC_DEPLOY_WP_ORG_MODE', true);`
in constants.php, this will replace all instances
of `defined('STATIC_DEPLOY_WP_ORG_MODE')` with
`true`. This allows other optimizations like dead
code elimination to work.

Author: john-shaffer

rector.php

@@ -2,8 +2,10 @@
 
 require_once __DIR__ . '/util/rector/RemoveAlwaysFalseIfStatementRector.php';
 require_once __DIR__ . '/util/rector/RemoveAlwaysTrueIfConditionRector2.php';
+require_once __DIR__ . '/util/rector/ReplaceKnownDefinedWithBooleanRector.php';
 
 use Rector\Config\RectorConfig;
+use Rector\Constants\Rector\FuncCall\ReplaceKnownDefinedWithBooleanRector;
 use Rector\DeadCode\Rector\For_\RemoveDeadContinueRector;
 use Rector\DeadCode\Rector\If_\RemoveAlwaysFalseIfStatementRector;
 use Rector\DeadCode\Rector\If_\RemoveAlwaysTrueIfConditionRector2;
@@ -31,6 +33,7 @@
         [
             RemoveAlwaysFalseIfStatementRector::class,
             RemoveAlwaysTrueIfConditionRector2::class,
+            ReplaceKnownDefinedWithBooleanRector::class,
         ]
     )
     ->withSets(

util/rector/ReplaceKnownDefinedWithBooleanRector.php

@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Constants\Rector\FuncCall;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\FuncCall;
+use PhpParser\Node\Name;
+use PhpParser\Node\Scalar\String_;
+use PhpParser\Node\Expr\ConstFetch;
+use Rector\Rector\AbstractRector;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * Replace defined() calls with boolean values when the constant is defined in bootstrap
+ *
+ * @see \Rector\Tests\DeadCode\Rector\FuncCall\ReplaceDefinedWithBooleanRector\ReplaceDefinedWithBooleanRectorTest
+ */
+final class ReplaceKnownDefinedWithBooleanRector extends AbstractRector
+{
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition('Replace defined() calls with boolean true values when the constant is defined in bootstrap', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+if (defined('BOOTSTRAPPED_CONSTANT')) {
+    // do something
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+if (true) {
+    // do something
+}
+CODE_SAMPLE
+            )
+        ]);
+    }
+
+    /**
+     * @return array<class-string<Node>>
+     */
+    public function getNodeTypes(): array
+    {
+        return [FuncCall::class];
+    }
+
+    /**
+     * @param FuncCall $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (!$this->isName($node, 'defined')) {
+            return null;
+        }
+
+        if (count($node->args) !== 1) {
+            return null;
+        }
+
+        $firstArg = $node->args[0]->value;
+        if (!$firstArg instanceof String_) {
+            return null;
+        }
+
+        if (defined($firstArg->value)) {
+            return new ConstFetch(new Name('true'));
+        }
+
+        return null;
+    }
+}