8 files declare their use of ComponentPluginManager

ComponentKernelTestBase.php in core/tests/Drupal/Tests/Core/Theme/Component/ComponentKernelTestBase.php
ComponentKernelTestBase.php in core/tests/Drupal/KernelTests/Components/ComponentKernelTestBase.php
ComponentLoader.php in core/lib/Drupal/Core/Template/Loader/ComponentLoader.php
ComponentNodeVisitor.php in core/lib/Drupal/Core/Template/ComponentNodeVisitor.php
ComponentRenderTest.php in core/tests/Drupal/KernelTests/Components/ComponentRenderTest.php
ComponentsTwigExtension.php in core/lib/Drupal/Core/Template/ComponentsTwigExtension.php
LibraryDiscoveryParser.php in core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
LibraryDiscoveryParserTest.php in core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.