diff --git a/src/Configurator/AbstractConfigurator.php b/src/Configurator/AbstractConfigurator.php
index 26711fcc0..aea4dda94 100644
--- a/src/Configurator/AbstractConfigurator.php
+++ b/src/Configurator/AbstractConfigurator.php
@@ -43,7 +43,7 @@ abstract public function unconfigure(Recipe $recipe, $config, Lock $lock);
 
     abstract public function update(RecipeUpdate $recipeUpdate, array $originalConfig, array $newConfig): void;
 
-    protected function write($messages)
+    protected function write($messages, $verbosity = IOInterface::VERBOSE)
     {
         if (!\is_array($messages)) {
             $messages = [$messages];
@@ -51,7 +51,7 @@ protected function write($messages)
         foreach ($messages as $i => $message) {
             $messages[$i] = '    '.$message;
         }
-        $this->io->writeError($messages, true, IOInterface::VERBOSE);
+        $this->io->writeError($messages, true, $verbosity);
     }
 
     protected function isFileMarked(Recipe $recipe, string $file): bool
diff --git a/src/Configurator/AddLinesConfigurator.php b/src/Configurator/AddLinesConfigurator.php
index b22c1cb92..87fd320bf 100644
--- a/src/Configurator/AddLinesConfigurator.php
+++ b/src/Configurator/AddLinesConfigurator.php
@@ -2,6 +2,7 @@
 
 namespace Symfony\Flex\Configurator;
 
+use Composer\IO\IOInterface;
 use Symfony\Flex\Lock;
 use Symfony\Flex\Recipe;
 use Symfony\Flex\Update\RecipeUpdate;
@@ -35,7 +36,11 @@ public function configure(Recipe $recipe, $config, Lock $lock, array $options =
 
             $file = $this->path->concatenate([$this->options->get('root-dir'), $patch['file']]);
             if (!is_file($file)) {
-                $this->write(sprintf('Skipping patch on file "%s": it does not exist.', $patch['file']));
+                $this->write(
+                    sprintf('Skipping update of file "%s": it does not exist.', $patch['file']),
+                    isset($patch['warn_if_missing']) && $patch['warn_if_missing'] ? IOInterface::NORMAL : IOInterface::VERBOSE
+                );
+
                 continue;
             }
 
@@ -50,7 +55,7 @@ public function configure(Recipe $recipe, $config, Lock $lock, array $options =
                 throw new \InvalidArgumentException(sprintf('The "position" key is required for the "add-lines" configurator for recipe "%s".', $recipe->getName()));
             }
             $position = $patch['position'];
-            if (!in_array($position, self::VALID_POSITIONS, true)) {
+            if (!\in_array($position, self::VALID_POSITIONS, true)) {
                 throw new \InvalidArgumentException(sprintf('The "position" key must be one of "%s" for the "add-lines" configurator for recipe "%s".', implode('", "', self::VALID_POSITIONS), $recipe->getName()));
             }
 
@@ -96,7 +101,7 @@ public function update(RecipeUpdate $recipeUpdate, array $originalConfig, array
             return !isset($item['requires']) || $this->isPackageInstalled($item['requires']);
         });
 
-        $filterDuplicates = function(array $sourceConfig, array $comparisonConfig) {
+        $filterDuplicates = function (array $sourceConfig, array $comparisonConfig) {
             $filtered = [];
             foreach ($sourceConfig as $sourceItem) {
                 $found = false;
@@ -177,7 +182,7 @@ private function unPatchFile(string $file, $value)
         }
 
         $position = strpos($fileContents, $value);
-        $fileContents = substr_replace($fileContents, '', $position, strlen($value));
+        $fileContents = substr_replace($fileContents, '', $position, \strlen($value));
 
         file_put_contents($file, $fileContents);
     }
diff --git a/src/PackageJsonSynchronizer.php b/src/PackageJsonSynchronizer.php
index ae845c013..4efe1e229 100644
--- a/src/PackageJsonSynchronizer.php
+++ b/src/PackageJsonSynchronizer.php
@@ -126,7 +126,7 @@ private function resolvePackageJsonDependencies($phpPackage): array
         }
 
         if ($packageJson->read()['symfony']['needsPackageAsADependency'] ?? true) {
-            $dependencies['@' . $phpPackage['name']] = 'file:' . substr($packageJson->getPath(), 1 + \strlen($this->rootDir), -13);
+            $dependencies['@'.$phpPackage['name']] = 'file:'.substr($packageJson->getPath(), 1 + \strlen($this->rootDir), -13);
         }
 
         foreach ($packageJson->read()['peerDependencies'] ?? [] as $peerDependency => $constraint) {
@@ -147,7 +147,7 @@ private function resolveImportMapPackages($phpPackage): array
         foreach ($packageJson->read()['symfony']['importmap'] ?? [] as $dependency => $constraint) {
             if (0 === strpos($constraint, 'path:')) {
                 $dependencies[$dependency] = [
-                    'path' => dirname($packageJson->getPath()).'/'.substr($constraint, 5)
+                    'path' => \dirname($packageJson->getPath()).'/'.substr($constraint, 5),
                 ];
 
                 continue;
@@ -226,7 +226,7 @@ private function updateImportMap(array $importMapEntries): void
             return;
         }
 
-        $importMapData = include($this->rootDir.'/importmap.php');
+        $importMapData = include $this->rootDir.'/importmap.php';
 
         $remotePackageNameAndConstraints = [];
         foreach ($importMapEntries as $name => $importMapEntry) {
@@ -250,7 +250,11 @@ private function updateImportMap(array $importMapEntries): void
                 continue;
             }
 
-            throw new \InvalidArgumentException(sprintf('Invalid importmap entry: %s', var_export($importMapEntry, true)));
+            throw new \InvalidArgumentException(sprintf('Invalid importmap entry: "%s".', var_export($importMapEntry, true)));
+        }
+
+        if (!$remotePackageNameAndConstraints) {
+            return;
         }
 
         $this->scriptExecutor->execute(
diff --git a/src/ScriptExecutor.php b/src/ScriptExecutor.php
index 20f5194e6..d61694735 100644
--- a/src/ScriptExecutor.php
+++ b/src/ScriptExecutor.php
@@ -117,7 +117,7 @@ private function expandPhpScript(string $cmd, array $scriptArguments): string
 
         $arguments = $phpFinder->findArguments();
 
-        if ($env = (string) (getenv('COMPOSER_ORIGINAL_INIS'))) {
+        if ($env = (string) getenv('COMPOSER_ORIGINAL_INIS')) {
             $paths = explode(\PATH_SEPARATOR, $env);
             $ini = array_shift($paths);
         } else {
diff --git a/tests/Configurator/AddLinesConfiguratorTest.php b/tests/Configurator/AddLinesConfiguratorTest.php
index 17cbb71c4..5c94f7dc6 100644
--- a/tests/Configurator/AddLinesConfiguratorTest.php
+++ b/tests/Configurator/AddLinesConfiguratorTest.php
@@ -32,11 +32,10 @@ protected function setUp(): void
         $filesystem->remove(FLEX_TEST_DIR);
     }
 
-
     public function testFileDoesNotExistSkipped()
     {
         $this->runConfigure([
-            ['file' => 'non-existent.php']
+            ['file' => 'non-existent.php'],
         ]);
         $this->assertFileDoesNotExist(FLEX_TEST_DIR.'/non-existent.php');
     }
@@ -54,7 +53,7 @@ public function testLinesAddedToTopOfFile()
             [
                 'file' => 'assets/app.js',
                 'position' => 'top',
-                'content' => "import './bootstrap';"
+                'content' => "import './bootstrap';",
             ],
         ]);
         $actualContents = $this->readFile('assets/app.js');
@@ -63,7 +62,8 @@ public function testLinesAddedToTopOfFile()
 import * as Turbo from '@hotwired/turbo';
 
 console.log(Turbo);
-EOF,
+EOF
+            ,
             $actualContents);
     }
 
@@ -80,7 +80,7 @@ public function testLinesAddedToBottomOfFile()
             [
                 'file' => 'assets/app.js',
                 'position' => 'bottom',
-                'content' => "import './bootstrap';"
+                'content' => "import './bootstrap';",
             ],
         ]);
         $actualContents = $this->readFile('assets/app.js');
@@ -89,7 +89,8 @@ public function testLinesAddedToBottomOfFile()
 
 console.log(Turbo);
 import './bootstrap';
-EOF,
+EOF
+            ,
             $actualContents);
     }
 
@@ -122,7 +123,6 @@ public function testLinesAddedAfterTarget()
     // enables the Symfony UX Stimulus bridge (used in assets/bootstrap.js)
     .enableStimulusBridge('./assets/controllers.json')
 EOF
-
             ],
         ]);
 
@@ -144,7 +144,8 @@ public function testLinesAddedAfterTarget()
 ;
 
 module.exports = Encore.getWebpackConfig();
-EOF,
+EOF
+            ,
             $actualContents);
     }
 
@@ -171,7 +172,6 @@ public function testSkippedIfTargetCannotBeFound()
 
     // some new line
 EOF
-
             ],
         ]);
 
@@ -193,7 +193,7 @@ public function testPatchIgnoredIfValueAlreadyExists()
             [
                 'file' => 'assets/app.js',
                 'position' => 'top',
-                'content' => "import './bootstrap';"
+                'content' => "import './bootstrap';",
             ],
         ]);
         $actualContents = $this->readFile('assets/app.js');
@@ -212,30 +212,31 @@ public function testLinesAddedToMultipleFiles()
 EOF
         );
 
-
         $this->runConfigure([
             [
                 'file' => 'assets/app.js',
                 'position' => 'top',
-                'content' => "import './bootstrap';"
+                'content' => "import './bootstrap';",
             ],
             [
                 'file' => 'assets/bootstrap.js',
                 'position' => 'bottom',
-                'content' => "console.log('on the bottom');"
+                'content' => "console.log('on the bottom');",
             ],
         ]);
 
         $this->assertSame(<<<EOF
 import './bootstrap';
 import * as Turbo from '@hotwired/turbo';
-EOF,
+EOF
+            ,
             $this->readFile('assets/app.js'));
 
         $this->assertSame(<<<EOF
 console.log('bootstrap.js');
 console.log('on the bottom');
-EOF,
+EOF
+            ,
             $this->readFile('assets/bootstrap.js'));
     }
 
@@ -248,6 +249,7 @@ public function testLineSkippedIfRequiredPackageMissing()
 EOF
         );
 
+        $composer = $this->createComposerMockWithPackagesInstalled([]);
         $this->runConfigure([
             [
                 'file' => 'assets/app.js',
@@ -255,13 +257,14 @@ public function testLineSkippedIfRequiredPackageMissing()
                 'content' => "import './bootstrap';",
                 'requires' => 'symfony/invented-package',
             ],
-        ]);
+        ], $composer);
         $actualContents = $this->readFile('assets/app.js');
         $this->assertSame(<<<EOF
 import * as Turbo from '@hotwired/turbo';
 
 console.log(Turbo);
-EOF,
+EOF
+            ,
             $actualContents);
     }
 
@@ -293,7 +296,8 @@ public function testLineProcessedIfRequiredPackageIsPresent()
 import * as Turbo from '@hotwired/turbo';
 
 console.log(Turbo);
-EOF,
+EOF
+            ,
             $actualContents);
     }
 
@@ -356,7 +360,7 @@ public function getUnconfigureTests()
 console.log(Turbo);
 EOF
             ,
-            "console.log(Turbo);",
+            'console.log(Turbo);',
             <<<EOF
 import * as Turbo from '@hotwired/turbo';
 import './bootstrap';
@@ -390,7 +394,7 @@ public function getUnconfigureTests()
 console.log(Turbo);
 EOF
             ,
-            "console.log(Turbo);",
+            'console.log(Turbo);',
             <<<EOF
 import * as Turbo from '@hotwired/turbo';
 import './bootstrap';
@@ -439,14 +443,13 @@ public function getUpdateTests()
 console.log('on the bottom');
 EOF;
 
-
         yield 'recipe_changes_patch_contents' => [
             ['assets/app.js' => $appJs],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './bootstrap';"]
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './bootstrap';"],
             ],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './stimulus_bootstrap';"]
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './stimulus_bootstrap';"],
             ],
             ['assets/app.js' => <<<EOF
 import './stimulus_bootstrap';
@@ -460,10 +463,10 @@ public function getUpdateTests()
         yield 'recipe_file_and_value_same_before_and_after' => [
             ['assets/app.js' => $appJs],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"]
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"],
             ],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"]
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"],
             ],
             ['assets/app.js' => $appJs],
         ];
@@ -471,17 +474,18 @@ public function getUpdateTests()
         yield 'different_files_unconfigures_old_and_configures_new' => [
             ['assets/app.js' => $appJs, 'assets/bootstrap.js' => $bootstrapJs],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"]
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"],
             ],
             [
-                ['file' => 'assets/bootstrap.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"]
+                ['file' => 'assets/bootstrap.js', 'position' => 'top', 'content' => "import * as Turbo from '@hotwired/turbo';"],
             ],
             [
                 'assets/app.js' => <<<EOF
 import './bootstrap';
 
 console.log(Turbo);
-EOF,
+EOF
+                ,
                 'assets/bootstrap.js' => <<<EOF
 import * as Turbo from '@hotwired/turbo';
 console.log('bootstrap.js');
@@ -494,10 +498,10 @@ public function getUpdateTests()
         yield 'recipe_changes_but_ignored_because_package_not_installed' => [
             ['assets/app.js' => $appJs],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './bootstrap';", 'requires' => 'symfony/not-installed']
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './bootstrap';", 'requires' => 'symfony/not-installed'],
             ],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './stimulus_bootstrap';", 'requires' => 'symfony/not-installed']
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './stimulus_bootstrap';", 'requires' => 'symfony/not-installed'],
             ],
             ['assets/app.js' => $appJs],
         ];
@@ -505,10 +509,10 @@ public function getUpdateTests()
         yield 'recipe_changes_are_applied_if_required_package_installed' => [
             ['assets/app.js' => $appJs],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './bootstrap';", 'requires' => 'symfony/installed-package']
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './bootstrap';", 'requires' => 'symfony/installed-package'],
             ],
             [
-                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './stimulus_bootstrap';", 'requires' => 'symfony/installed-package']
+                ['file' => 'assets/app.js', 'position' => 'top', 'content' => "import './stimulus_bootstrap';", 'requires' => 'symfony/installed-package'],
             ],
             ['assets/app.js' => <<<EOF
 import './stimulus_bootstrap';
@@ -541,7 +545,7 @@ private function runUnconfigure(array $config)
     private function createConfigurator(Composer $composer = null)
     {
         return new AddLinesConfigurator(
-            $composer ? $composer : $this->getMockBuilder(Composer::class)->getMock(),
+            $composer ?: $this->getMockBuilder(Composer::class)->getMock(),
             $this->getMockBuilder(IOInterface::class)->getMock(),
             new Options(['config-dir' => 'config', 'root-dir' => FLEX_TEST_DIR])
         );