diff --git a/lib/PhpParser/Node/Expr/ArrayItem.php b/lib/PhpParser/Node/Expr/ArrayItem.php
index 490ac93793..be9d0708d1 100644
--- a/lib/PhpParser/Node/Expr/ArrayItem.php
+++ b/lib/PhpParser/Node/Expr/ArrayItem.php
@@ -1,3 +1,11 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Expr;
+
 require __DIR__ . '/../ArrayItem.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class ArrayItem extends \PhpParser\Node\ArrayItem {
+    }
+}
diff --git a/lib/PhpParser/Node/Expr/ClosureUse.php b/lib/PhpParser/Node/Expr/ClosureUse.php
index 681ff317be..b395617202 100644
--- a/lib/PhpParser/Node/Expr/ClosureUse.php
+++ b/lib/PhpParser/Node/Expr/ClosureUse.php
@@ -1,3 +1,11 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Expr;
+
 require __DIR__ . '/../ClosureUse.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class ClosureUse extends \PhpParser\Node\ClosureUse {
+    }
+}
diff --git a/lib/PhpParser/Node/Scalar/DNumber.php b/lib/PhpParser/Node/Scalar/DNumber.php
index ad3937a54c..aaafc5fece 100644
--- a/lib/PhpParser/Node/Scalar/DNumber.php
+++ b/lib/PhpParser/Node/Scalar/DNumber.php
@@ -1,3 +1,11 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Scalar;
+
 require __DIR__ . '/Float_.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class DNumber extends Float_ {
+    }
+}
diff --git a/lib/PhpParser/Node/Scalar/Encapsed.php b/lib/PhpParser/Node/Scalar/Encapsed.php
index c5aaf5b4e2..a97545e7bd 100644
--- a/lib/PhpParser/Node/Scalar/Encapsed.php
+++ b/lib/PhpParser/Node/Scalar/Encapsed.php
@@ -1,3 +1,11 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Scalar;
+
 require __DIR__ . '/InterpolatedString.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class Encapsed extends InterpolatedString {
+    }
+}
diff --git a/lib/PhpParser/Node/Scalar/EncapsedStringPart.php b/lib/PhpParser/Node/Scalar/EncapsedStringPart.php
index 990e9801b5..7ef5fb0c09 100644
--- a/lib/PhpParser/Node/Scalar/EncapsedStringPart.php
+++ b/lib/PhpParser/Node/Scalar/EncapsedStringPart.php
@@ -1,3 +1,13 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Scalar;
+
+use PhpParser\Node\InterpolatedStringPart;
+
 require __DIR__ . '/../InterpolatedStringPart.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class EncapsedStringPart extends InterpolatedStringPart {
+    }
+}
diff --git a/lib/PhpParser/Node/Scalar/LNumber.php b/lib/PhpParser/Node/Scalar/LNumber.php
index cfe8c8c1c5..0d1287105d 100644
--- a/lib/PhpParser/Node/Scalar/LNumber.php
+++ b/lib/PhpParser/Node/Scalar/LNumber.php
@@ -1,3 +1,11 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Scalar;
+
 require __DIR__ . '/Int_.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class LNumber extends Int_ {
+    }
+}
diff --git a/lib/PhpParser/Node/Stmt/DeclareDeclare.php b/lib/PhpParser/Node/Stmt/DeclareDeclare.php
index cb9e8376e3..1a3c3616d4 100644
--- a/lib/PhpParser/Node/Stmt/DeclareDeclare.php
+++ b/lib/PhpParser/Node/Stmt/DeclareDeclare.php
@@ -1,3 +1,13 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Stmt;
+
+use PhpParser\Node\DeclareItem;
+
 require __DIR__ . '/../DeclareItem.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class DeclareDeclare extends DeclareItem {
+    }
+}
diff --git a/lib/PhpParser/Node/Stmt/PropertyProperty.php b/lib/PhpParser/Node/Stmt/PropertyProperty.php
index 4a21a8806b..fe7c99736b 100644
--- a/lib/PhpParser/Node/Stmt/PropertyProperty.php
+++ b/lib/PhpParser/Node/Stmt/PropertyProperty.php
@@ -1,3 +1,13 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Stmt;
+
+use PhpParser\Node\PropertyItem;
+
 require __DIR__ . '/../PropertyItem.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class PropertyProperty extends PropertyItem {
+    }
+}
diff --git a/lib/PhpParser/Node/Stmt/StaticVar.php b/lib/PhpParser/Node/Stmt/StaticVar.php
index 88452e7f9c..6775b9597f 100644
--- a/lib/PhpParser/Node/Stmt/StaticVar.php
+++ b/lib/PhpParser/Node/Stmt/StaticVar.php
@@ -1,3 +1,11 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Stmt;
+
 require __DIR__ . '/../StaticVar.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class StaticVar extends \PhpParser\Node\StaticVar {
+    }
+}
diff --git a/lib/PhpParser/Node/Stmt/UseUse.php b/lib/PhpParser/Node/Stmt/UseUse.php
index 85830edc3b..b14fbd6ea1 100644
--- a/lib/PhpParser/Node/Stmt/UseUse.php
+++ b/lib/PhpParser/Node/Stmt/UseUse.php
@@ -1,3 +1,13 @@
 <?php declare(strict_types=1);
 
+namespace PhpParser\Node\Stmt;
+
+use PhpParser\Node\UseItem;
+
 require __DIR__ . '/../UseItem.php';
+
+if (false) {
+    // For classmap-authoritative support.
+    class UseUse extends UseItem {
+    }
+}
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 60320107ca..8340a1a48e 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -90,6 +90,56 @@ parameters:
 			count: 1
 			path: lib/PhpParser/Lexer/Emulative.php
 
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Expr/ArrayItem.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Expr/ClosureUse.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Scalar/DNumber.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Scalar/Encapsed.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Scalar/EncapsedStringPart.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Scalar/LNumber.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Stmt/DeclareDeclare.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Stmt/PropertyProperty.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Stmt/StaticVar.php
+
+		-
+			message: "#^If condition is always false\\.$#"
+			count: 1
+			path: lib/PhpParser/Node/Stmt/UseUse.php
+
 		-
 			message: "#^Constant T_PRIVATE_SET not found\\.$#"
 			count: 2