diff --git a/dist/changes-4.15.0.md b/dist/changes-4.15.0.md
index 0063b200108..1ae6ebcdb4a 100644
--- a/dist/changes-4.15.0.md
+++ b/dist/changes-4.15.0.md
@@ -33,9 +33,11 @@ Editing
 
 ### C++
 
-* Added options for generation of getters and setters (QTCREATORBUG-1532)
-* Added `Create Constructor` refactoring operation
-* Added filtering of `Find Usages` based on access type (QTCREATORBUG-19373)
+* Added `Create Getter and Setter Member Functions` refactoring action
+  (QTCREATORBUG-1532)
+* Added `Generate Constructor` refactoring action
+* Added filtering of `Find References to Symbol Under Cursor` based on access
+  type (QTCREATORBUG-19373)
 * Added `Open in Editor` and `Open Type Hierarchy` to context menu on items in
   type hierarchy
 * Added highlighting of previous class when navigating in type hierarchy
diff --git a/doc/qtcreator/images/qtcreator-find-references-to-symbol-under-cursor.png b/doc/qtcreator/images/qtcreator-find-references-to-symbol-under-cursor.png
new file mode 100644
index 00000000000..c2ad158b183
Binary files /dev/null and b/doc/qtcreator/images/qtcreator-find-references-to-symbol-under-cursor.png differ
diff --git a/doc/qtcreator/images/qtcreator-refactoring-constructor.png b/doc/qtcreator/images/qtcreator-refactoring-constructor.png
new file mode 100644
index 00000000000..57d0bd7fd61
Binary files /dev/null and b/doc/qtcreator/images/qtcreator-refactoring-constructor.png differ
diff --git a/doc/qtcreator/images/qtcreator-refactoring-find.png b/doc/qtcreator/images/qtcreator-refactoring-find.png
index d2524de7ec1..5cf396361e2 100644
Binary files a/doc/qtcreator/images/qtcreator-refactoring-find.png and b/doc/qtcreator/images/qtcreator-refactoring-find.png differ
diff --git a/doc/qtcreator/images/qtcreator-refactoring-replace.png b/doc/qtcreator/images/qtcreator-refactoring-replace.png
index d0fa9dec475..3ef3359acc3 100644
Binary files a/doc/qtcreator/images/qtcreator-refactoring-replace.png and b/doc/qtcreator/images/qtcreator-refactoring-replace.png differ
diff --git a/doc/qtcreator/images/qtcreator-search-cpp-symbols.png b/doc/qtcreator/images/qtcreator-search-cpp-symbols.png
index 9f34e8f621c..f5aade540c9 100644
Binary files a/doc/qtcreator/images/qtcreator-search-cpp-symbols.png and b/doc/qtcreator/images/qtcreator-search-cpp-symbols.png differ
diff --git a/doc/qtcreator/src/editors/creator-code-refactoring.qdoc b/doc/qtcreator/src/editors/creator-code-refactoring.qdoc
index 19f6f53a6e9..23f7d690639 100644
--- a/doc/qtcreator/src/editors/creator-code-refactoring.qdoc
+++ b/doc/qtcreator/src/editors/creator-code-refactoring.qdoc
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2020 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -51,6 +51,8 @@
     \uicontrol {C++} > \uicontrol {Find References to Symbol Under Cursor} or
     press \key {Ctrl+Shift+U}.
 
+    \image qtcreator-find-references-to-symbol-under-cursor.png "Search results for finding references to symbols"
+
     \note You can also select \uicontrol Edit > \uicontrol {Find/Replace} >
     \uicontrol {Advanced Find} > \uicontrol {C++ Symbols} to search for
     classes, functions, enums, and declarations either from files listed as
@@ -100,6 +102,10 @@
         \li To expand and collapse the list of all instances, click the
             \inlineimage qtcreator-expand.png
             (\uicontrol {Expand All}) button.
+        \li To filter the search results for the usage of symbols according to
+            access type, such as read, write, or declaration, click the
+            \inlineimage filtericon.png
+            (\uicontrol {Filter Tree}) button and select the access type.
         \li To clear the search results, click the
             \inlineimage clean_pane_small.png
             (\uicontrol Clear) button.
@@ -184,7 +190,8 @@
     \section1 Creating Functions
 
     You can apply refactoring actions to implement member functions, insert
-    virtual functions of base classes, and greate getter and setter functions.
+    virtual functions of base classes, create getter and setter functions,
+    and generate constructors.
 
     \section2 Implementing Member Functions
 
@@ -217,6 +224,16 @@
     for member variables or only a getter or setter.
 
     \image qtcreator-refactoring-getters-and-setters.png "Getters and Setters dialog"
+
+    \section2 Generating Constructors
+
+    You can apply the \uicontrol {Generate Constructor} refactoring action to
+    create a public, protected, or private constructor for a class. Select the
+    class members to initialize in the constructor. Drag and drop the parameters
+    to specify their order in the constructor.
+
+    \image qtcreator-refactoring-constructor.png "Constructor dialog"
+
     \endif
 
     \section1 Summary of Refactoring Actions
@@ -668,6 +685,10 @@
             \li Creates either both getter and setter member functions for
                 member variables or only a getter or setter.
             \li Member variable in class definition
+        \row
+            \li Generate Constructor
+            \li Creates a constructor for a class.
+            \li Class definition
         \row
             \li Move Function Definition
             \li Moves a function definition to the implementation file, outside
diff --git a/share/qtcreator/qmldesigner/itemLibraryQmlSources/ItemsView.qml b/share/qtcreator/qmldesigner/itemLibraryQmlSources/ItemsView.qml
index 1f4ad7ddfd0..2f792372331 100644
--- a/share/qtcreator/qmldesigner/itemLibraryQmlSources/ItemsView.qml
+++ b/share/qtcreator/qmldesigner/itemLibraryQmlSources/ItemsView.qml
@@ -139,7 +139,10 @@ ScrollView {
                 bottomPadding: 0
                 expanded: importExpanded
                 expandOnClick: false
-                onToggleExpand: importExpanded = !importExpanded
+                onToggleExpand: {
+                    if (categoryModel.rowCount() > 0)
+                        importExpanded = !importExpanded
+                }
                 onShowContextMenu: {
                     importToRemove = importUsed ? "" : importUrl
                     contextMenu.popup()
diff --git a/src/libs/qmljs/qmljsreformatter.cpp b/src/libs/qmljs/qmljsreformatter.cpp
index de69df50438..60e32288c97 100644
--- a/src/libs/qmljs/qmljsreformatter.cpp
+++ b/src/libs/qmljs/qmljsreformatter.cpp
@@ -989,6 +989,21 @@ protected:
                 out("const ");
             }
         }
+        switch (ast->type) {
+        case PatternElement::Literal:
+        case PatternElement::Method:
+        case PatternElement::Binding:
+            break;
+        case PatternElement::Getter:
+            out("get ");
+            break;
+        case PatternElement::Setter:
+            out("set ");
+            break;
+        case PatternElement::SpreadElement:
+            out("...");
+            break;
+        }
         out(ast->identifierToken);
         if (ast->initializer) {
             if (ast->isVariableDeclaration())
@@ -1312,6 +1327,8 @@ protected:
     bool visit(ArgumentList *ast) override
     {
         for (ArgumentList *it = ast; it; it = it->next) {
+            if (it->isSpreadElement)
+                out("...");
             accept(it->expression);
             if (it->next) {
                 out(", ", it->commaToken);
diff --git a/src/plugins/android/androidavdmanager.cpp b/src/plugins/android/androidavdmanager.cpp
index c000a623544..7fb12a49d64 100644
--- a/src/plugins/android/androidavdmanager.cpp
+++ b/src/plugins/android/androidavdmanager.cpp
@@ -403,7 +403,7 @@ AndroidDeviceInfoList AvdManagerOutputParser::listVirtualDevices(const AndroidCo
         avdList = parseAvdList(output);
     } while (output.contains(avdManufacturerError));
 
-    for (const QString &avdPathStr : avdErrorPaths)
+    for (const QString &avdPathStr : qAsConst(avdErrorPaths))
         AvdConfigEditManufacturerTag(avdPathStr, true);
 
     return avdList;
diff --git a/src/plugins/android/androidconfigurations.cpp b/src/plugins/android/androidconfigurations.cpp
index a57e9e851a0..34593bb340f 100644
--- a/src/plugins/android/androidconfigurations.cpp
+++ b/src/plugins/android/androidconfigurations.cpp
@@ -1494,7 +1494,7 @@ FilePath AndroidConfig::getJdkPath()
 #endif // Q_OS_WIN
         }
 
-        for (const QString &version : allVersions) {
+        for (const QString &version : qAsConst(allVersions)) {
             settings->beginGroup(version);
             jdkHome = FilePath::fromUserInput(settings->value("JavaHome").toString());
             settings->endGroup();
diff --git a/src/plugins/android/androidrunnerworker.cpp b/src/plugins/android/androidrunnerworker.cpp
index ac27b3b14c6..b07e6210599 100644
--- a/src/plugins/android/androidrunnerworker.cpp
+++ b/src/plugins/android/androidrunnerworker.cpp
@@ -538,7 +538,7 @@ void AndroidRunnerWorker::asyncStartHelper()
     forceStop();
     asyncStartLogcat();
 
-    for (const QString &entry : m_beforeStartAdbCommands)
+    for (const QString &entry : qAsConst(m_beforeStartAdbCommands))
         runAdb(entry.split(' ', Qt::SkipEmptyParts));
 
     QStringList args({"shell", "am", "start"});
@@ -825,7 +825,7 @@ void AndroidRunnerWorker::onProcessIdChanged(qint64 pid)
         m_debugServerProcess.reset();
 
         // Run adb commands after application quit.
-        for (const QString &entry: m_afterFinishAdbCommands)
+        for (const QString &entry: qAsConst(m_afterFinishAdbCommands))
             runAdb(entry.split(' ', Qt::SkipEmptyParts));
     } else {
         // In debugging cases this will be funneled to the engine to actually start
diff --git a/src/plugins/android/androidsdkmanager.cpp b/src/plugins/android/androidsdkmanager.cpp
index b84b6fea84f..ca66e26576f 100644
--- a/src/plugins/android/androidsdkmanager.cpp
+++ b/src/plugins/android/androidsdkmanager.cpp
@@ -566,7 +566,7 @@ void SdkManagerOutputParser::compilePackageAssociations()
     deleteAlreadyInstalled(images);
 
     // Associate the system images with sdk platforms.
-    for (AndroidSdkPackage *image : images) {
+    for (AndroidSdkPackage *image : qAsConst(images)) {
         int imageApi = m_systemImages[image];
         auto itr = std::find_if(m_packages.begin(), m_packages.end(),
                                 [imageApi](const AndroidSdkPackage *p) {
@@ -1151,7 +1151,7 @@ void AndroidSdkManagerPrivate::parseCommonArguments(QFutureInterface<QString> &f
 
 void AndroidSdkManagerPrivate::clearPackages()
 {
-    for (AndroidSdkPackage *p : m_allPackages)
+    for (AndroidSdkPackage *p : qAsConst(m_allPackages))
         delete p;
     m_allPackages.clear();
 }
diff --git a/src/plugins/android/androidsdkmodel.cpp b/src/plugins/android/androidsdkmodel.cpp
index 50205e735f2..2f83e86156c 100644
--- a/src/plugins/android/androidsdkmodel.cpp
+++ b/src/plugins/android/androidsdkmodel.cpp
@@ -298,7 +298,7 @@ void AndroidSdkModel::selectMissingEssentials()
     }
 
     // Select SDK platform
-    for (const SdkPlatform *platform : m_sdkPlatforms) {
+    for (const SdkPlatform *platform : qAsConst(m_sdkPlatforms)) {
         if (!platform->installedLocation().isEmpty()) {
             pendingPkgs.removeOne(platform->sdkStylePath());
         } else if (pendingPkgs.contains(platform->sdkStylePath()) &&
diff --git a/src/plugins/android/androidsdkpackage.cpp b/src/plugins/android/androidsdkpackage.cpp
index e9b019782bb..5b218c448c4 100644
--- a/src/plugins/android/androidsdkpackage.cpp
+++ b/src/plugins/android/androidsdkpackage.cpp
@@ -154,7 +154,7 @@ SdkPlatform::SdkPlatform(QVersionNumber version, QString sdkStylePathStr, int ap
 
 SdkPlatform::~SdkPlatform()
 {
-    for (SystemImage *image : m_systemImages)
+    for (SystemImage *image : qAsConst(m_systemImages))
         delete image;
     m_systemImages.clear();
 }
diff --git a/src/plugins/android/avddialog.cpp b/src/plugins/android/avddialog.cpp
index a9ea27f6bc1..9353f148bb4 100644
--- a/src/plugins/android/avddialog.cpp
+++ b/src/plugins/android/avddialog.cpp
@@ -177,7 +177,7 @@ void AvdDialog::updateDeviceDefinitionComboBox()
         m_avdDialog.deviceDefinitionTypeComboBox->currentText());
 
     m_avdDialog.deviceDefinitionComboBox->clear();
-    for (const DeviceDefinitionStruct &item : m_deviceDefinitionsList) {
+    for (const DeviceDefinitionStruct &item : qAsConst(m_deviceDefinitionsList)) {
         if (item.deviceType == curDeviceType)
             m_avdDialog.deviceDefinitionComboBox->addItem(item.name_id);
     }
@@ -231,7 +231,7 @@ void AvdDialog::updateApiLevelComboBox()
     });
 
     m_avdDialog.targetApiComboBox->clear();
-    for (SystemImage *image : filteredList) {
+    for (SystemImage *image : qAsConst(filteredList)) {
             QString imageString = "android-" % QString::number(image->apiLevel());
             const QStringList imageSplits = image->sdkStylePath().split(';');
             if (imageSplits.size() == 4)
diff --git a/src/plugins/android/javalanguageserver.cpp b/src/plugins/android/javalanguageserver.cpp
index d0b900a6066..42ee4529067 100644
--- a/src/plugins/android/javalanguageserver.cpp
+++ b/src/plugins/android/javalanguageserver.cpp
@@ -25,12 +25,21 @@
 
 #include "javalanguageserver.h"
 
+#include "androidconfigurations.h"
 #include "androidconstants.h"
+#include "androidmanager.h"
 
 #include <languageclient/client.h>
+#include <languageclient/languageclientinterface.h>
 #include <languageclient/languageclientutils.h>
+#include <projectexplorer/kitinformation.h>
+#include <projectexplorer/project.h>
+#include <projectexplorer/projectnodes.h>
+#include <projectexplorer/target.h>
+#include <qtsupport/qtkitinformation.h>
 #include <utils/environment.h>
 #include <utils/pathchooser.h>
+#include <utils/temporarydirectory.h>
 #include <utils/variablechooser.h>
 
 #include <QGridLayout>
@@ -39,7 +48,6 @@
 using namespace Utils;
 
 constexpr char languageServerKey[] = "languageServer";
-constexpr char workspaceKey[] = "workspace";
 
 namespace Android {
 namespace Internal {
@@ -67,7 +75,6 @@ JLSSettingsWidget::JLSSettingsWidget(const JLSSettings *settings, QWidget *paren
     , m_name(new QLineEdit(settings->m_name, this))
     , m_java(new PathChooser(this))
     , m_ls(new PathChooser(this))
-    , m_workspace(new PathChooser(this))
 {
     int row = 0;
     auto *mainLayout = new QGridLayout;
@@ -88,11 +95,6 @@ JLSSettingsWidget::JLSSettingsWidget(const JLSSettings *settings, QWidget *paren
     m_ls->setPath(QDir::toNativeSeparators(settings->m_languageServer));
     mainLayout->addWidget(m_ls, row, 1);
 
-    mainLayout->addWidget(new QLabel(tr("Workspace:")), ++row, 0);
-    m_workspace->setExpectedKind(Utils::PathChooser::Directory);
-    m_workspace->setPath(QDir::toNativeSeparators(settings->m_workspace));
-    mainLayout->addWidget(m_workspace, row, 1);
-
     setLayout(mainLayout);
 }
 
@@ -117,9 +119,6 @@ bool JLSSettings::applyFromSettingsWidget(QWidget *widget)
     changed |= m_languageServer != jlswidget->languageServer();
     m_languageServer = jlswidget->languageServer();
 
-    changed |= m_workspace != jlswidget->workspace();
-    m_workspace = jlswidget->workspace();
-
     changed |= m_executable != jlswidget->java();
     m_executable = jlswidget->java();
 
@@ -130,8 +129,7 @@ bool JLSSettings::applyFromSettingsWidget(QWidget *widget)
                         "-noverify "
                         "-Xmx1G "
                         "-jar \"%1\" "
-                        "-configuration \"%2\" "
-                        "-data \"%3\"";
+                        "-configuration \"%2\"";
 
     QFileInfo languageServerFileInfo(m_languageServer);
     QDir configDir = languageServerFileInfo.absoluteDir();
@@ -145,7 +143,7 @@ bool JLSSettings::applyFromSettingsWidget(QWidget *widget)
             configDir.cd("config_mac");
     }
     if (configDir.exists()) {
-        arguments = arguments.arg(m_languageServer, configDir.absolutePath(), m_workspace);
+        arguments = arguments.arg(m_languageServer, configDir.absolutePath());
         changed |= m_arguments != arguments;
         m_arguments = arguments;
     }
@@ -159,14 +157,13 @@ QWidget *JLSSettings::createSettingsWidget(QWidget *parent) const
 
 bool JLSSettings::isValid() const
 {
-    return StdIOSettings::isValid() && !m_languageServer.isEmpty() && !m_workspace.isEmpty();
+    return StdIOSettings::isValid() && !m_languageServer.isEmpty();
 }
 
 QVariantMap JLSSettings::toMap() const
 {
     QVariantMap map = StdIOSettings::toMap();
     map.insert(languageServerKey, m_languageServer);
-    map.insert(workspaceKey, m_workspace);
     return map;
 }
 
@@ -174,7 +171,6 @@ void JLSSettings::fromMap(const QVariantMap &map)
 {
     StdIOSettings::fromMap(map);
     m_languageServer = map[languageServerKey].toString();
-    m_workspace = map[workspaceKey].toString();
 }
 
 LanguageClient::BaseSettings *JLSSettings::copy() const
@@ -182,12 +178,39 @@ LanguageClient::BaseSettings *JLSSettings::copy() const
     return new JLSSettings(*this);
 }
 
+class JLSInterface : public LanguageClient::StdIOClientInterface
+{
+public:
+    JLSInterface() = default;
+
+    QString workspaceDir() const { return m_workspaceDir.path(); }
+
+private:
+    TemporaryDirectory m_workspaceDir = TemporaryDirectory("QtCreator-jls-XXXXXX");
+};
+
+LanguageClient::BaseClientInterface *JLSSettings::createInterface() const
+{
+    auto interface = new JLSInterface();
+    interface->setExecutable(m_executable);
+    QString arguments = this->arguments();
+    arguments += QString(" -data \"%1\"").arg(interface->workspaceDir());
+    interface->setArguments(arguments);
+    return interface;
+}
+
 class JLSClient : public LanguageClient::Client
 {
 public:
     using Client::Client;
 
     void executeCommand(const LanguageServerProtocol::Command &command) override;
+    void setCurrentProject(ProjectExplorer::Project *project) override;
+    void updateProjectFiles();
+    void updateTarget(ProjectExplorer::Target *target);
+
+private:
+    ProjectExplorer::Target *m_currentTarget = nullptr;
 };
 
 void JLSClient::executeCommand(const LanguageServerProtocol::Command &command)
@@ -206,6 +229,127 @@ void JLSClient::executeCommand(const LanguageServerProtocol::Command &command)
     }
 }
 
+void JLSClient::setCurrentProject(ProjectExplorer::Project *project)
+{
+    Client::setCurrentProject(project);
+    QTC_ASSERT(project, return);
+    updateTarget(project->activeTarget());
+    updateProjectFiles();
+    connect(project, &ProjectExplorer::Project::activeTargetChanged,
+            this, &JLSClient::updateTarget);
+}
+
+static void generateProjectFile(const FilePath &projectDir,
+                                const QString &qtSrc,
+                                const QString &projectName)
+{
+    const FilePath projectFilePath = projectDir.pathAppended(".project");
+    QFile projectFile(projectFilePath.toString());
+    if (projectFile.open(QFile::Truncate | QFile::WriteOnly)) {
+        QXmlStreamWriter writer(&projectFile);
+        writer.setAutoFormatting(true);
+        writer.writeStartDocument();
+        writer.writeComment("Autogenerated by Qt Creator. "
+                            "Changes to this file will not be taken into account.");
+        writer.writeStartElement("projectDescription");
+        writer.writeTextElement("name", projectName);
+        writer.writeStartElement("natures");
+        writer.writeTextElement("nature", "org.eclipse.jdt.core.javanature");
+        writer.writeEndElement(); // natures
+        writer.writeStartElement("linkedResources");
+        writer.writeStartElement("link");
+        writer.writeTextElement("name", "qtSrc");
+        writer.writeTextElement("type", "2");
+        writer.writeTextElement("location", qtSrc);
+        writer.writeEndElement(); // link
+        writer.writeEndElement(); // linkedResources
+        writer.writeEndElement(); // projectDescription
+        writer.writeEndDocument();
+        projectFile.close();
+    }
+}
+
+static void generateClassPathFile(const FilePath &projectDir,
+                                  const QString &sourceDir,
+                                  const QStringList &libs)
+{
+    const FilePath classPathFilePath = projectDir.pathAppended(".classpath");
+    QFile classPathFile(classPathFilePath.toString());
+    if (classPathFile.open(QFile::Truncate | QFile::WriteOnly)) {
+        QXmlStreamWriter writer(&classPathFile);
+        writer.setAutoFormatting(true);
+        writer.writeStartDocument();
+        writer.writeComment("Autogenerated by Qt Creator. "
+                            "Changes to this file will not be taken into account.");
+        writer.writeStartElement("classpath");
+        writer.writeEmptyElement("classpathentry");
+        writer.writeAttribute("kind", "src");
+        writer.writeAttribute("path", sourceDir);
+        writer.writeEmptyElement("classpathentry");
+        writer.writeAttribute("kind", "src");
+        writer.writeAttribute("path", "qtSrc");
+        for (const QString &lib : libs) {
+            writer.writeEmptyElement("classpathentry");
+            writer.writeAttribute("kind", "lib");
+            writer.writeAttribute("path", lib);
+        }
+        writer.writeEndElement(); // classpath
+        writer.writeEndDocument();
+        classPathFile.close();
+    }
+}
+
+void JLSClient::updateProjectFiles()
+{
+    using namespace ProjectExplorer;
+    if (!m_currentTarget)
+        return;
+    if (Target *target = m_currentTarget) {
+        Kit *kit = m_currentTarget->kit();
+        if (DeviceTypeKitAspect::deviceTypeId(kit) != Android::Constants::ANDROID_DEVICE_TYPE)
+            return;
+        if (ProjectNode *node = project()->findNodeForBuildKey(target->activeBuildKey())) {
+            QtSupport::BaseQtVersion *version = QtSupport::QtKitAspect::qtVersion(kit);
+            if (!version)
+                return;
+            const QString qtSrc = version->prefix().toString() + "/src/android/java/src";
+            const FilePath &projectDir = project()->rootProjectDirectory();
+            if (!projectDir.exists())
+                return;
+            const FilePath packageSourceDir = FilePath::fromVariant(
+                node->data(Constants::AndroidPackageSourceDir));
+            FilePath sourceDir = packageSourceDir.pathAppended("src");
+            if (!sourceDir.exists())
+                return;
+            sourceDir = sourceDir.relativeChildPath(projectDir);
+            const FilePath &sdkLocation = AndroidConfigurations::currentConfig().sdkLocation();
+            const QString &targetSDK = AndroidManager::buildTargetSDK(m_currentTarget);
+            const QString androidJar = QString("%1/platforms/%2/android.jar")
+                                           .arg(sdkLocation.toString(), targetSDK);
+            QStringList libs(androidJar);
+            QDir libDir(packageSourceDir.pathAppended("libs").toString());
+            libs << Utils::transform(libDir.entryInfoList({"*.jar"}, QDir::Files),
+                                     &QFileInfo::absoluteFilePath);
+            generateProjectFile(projectDir, qtSrc, project()->displayName());
+            generateClassPathFile(projectDir, sourceDir.toString(), libs);
+        }
+    }
+}
+
+void JLSClient::updateTarget(ProjectExplorer::Target *target)
+{
+    if (m_currentTarget) {
+        disconnect(m_currentTarget, &ProjectExplorer::Target::parsingFinished,
+                   this, &JLSClient::updateProjectFiles);
+    }
+    m_currentTarget = target;
+    if (m_currentTarget) {
+        connect(m_currentTarget, &ProjectExplorer::Target::parsingFinished,
+                this, &JLSClient::updateProjectFiles);
+    }
+    updateProjectFiles();
+}
+
 LanguageClient::Client *JLSSettings::createClient(LanguageClient::BaseClientInterface *interface) const
 {
     return new JLSClient(interface);
diff --git a/src/plugins/android/javalanguageserver.h b/src/plugins/android/javalanguageserver.h
index 58310070771..ab528cad15e 100644
--- a/src/plugins/android/javalanguageserver.h
+++ b/src/plugins/android/javalanguageserver.h
@@ -42,9 +42,9 @@ public:
     void fromMap(const QVariantMap &map) final;
     LanguageClient::BaseSettings *copy() const final;
     LanguageClient::Client *createClient(LanguageClient::BaseClientInterface *interface) const final;
+    LanguageClient::BaseClientInterface *createInterface() const override;
 
     QString m_languageServer;
-    QString m_workspace;
 
 private:
     JLSSettings(const JLSSettings &other) = default;
diff --git a/src/plugins/clangtools/clangtoolsunittests.cpp b/src/plugins/clangtools/clangtoolsunittests.cpp
index 512e6e71355..9d416f07cc1 100644
--- a/src/plugins/clangtools/clangtoolsunittests.cpp
+++ b/src/plugins/clangtools/clangtoolsunittests.cpp
@@ -128,7 +128,7 @@ void ClangToolsUnitTests::testProject()
     QVERIFY(waitForFinishedTool.wait(m_timeout));
 
     // Check for errors
-    const QString errorText = waitForFinishedTool.takeFirst().first().toString();
+    const QString errorText = waitForFinishedTool.takeFirst().constFirst().toString();
     const bool finishedSuccessfully = errorText.isEmpty();
     if (!finishedSuccessfully)
         qWarning("Error: %s", qPrintable(errorText));
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
index 03f5ecb51b1..4e31bad6b36 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
@@ -245,7 +245,7 @@ static FilePath qmakeFromCMakeCache(const CMakeConfig &config)
     if (!qmakeLocationTxt.open(QIODevice::ReadOnly)) {
         return FilePath();
     }
-    FilePath qmakeLocation = FilePath::fromUtf8(qmakeLocationTxt.readLine().data());
+    FilePath qmakeLocation = FilePath::fromUtf8(qmakeLocationTxt.readLine().constData());
     qCDebug(cmInputLog) << "qmake location: " << qmakeLocation.toUserOutput();
 
     return qmakeLocation;
diff --git a/src/plugins/languageclient/client.cpp b/src/plugins/languageclient/client.cpp
index 795f67fe050..ce2184d303a 100644
--- a/src/plugins/languageclient/client.cpp
+++ b/src/plugins/languageclient/client.cpp
@@ -100,6 +100,13 @@ Client::Client(BaseClientInterface *clientInterface)
             &Client::rehighlight);
 }
 
+QString Client::name() const
+{
+    if (m_project && !m_project->displayName().isEmpty())
+        return tr("%1 for %2").arg(m_displayName, m_project->displayName());
+    return m_displayName;
+}
+
 static void updateEditorToolBar(QList<TextEditor::TextDocument *> documents)
 {
     for (TextEditor::TextDocument *document : documents) {
@@ -790,6 +797,15 @@ void Client::projectOpened(ProjectExplorer::Project *project)
 
 void Client::projectClosed(ProjectExplorer::Project *project)
 {
+    if (sendWorkspceFolderChanges()) {
+        WorkspaceFoldersChangeEvent event;
+        event.setRemoved({WorkSpaceFolder(DocumentUri::fromFilePath(project->projectDirectory()),
+                                          project->displayName())});
+        DidChangeWorkspaceFoldersParams params;
+        params.setEvent(event);
+        DidChangeWorkspaceFoldersNotification change(params);
+        sendContent(change);
+    }
     if (project == m_project) {
         if (m_state == Initialized) {
             shutdown();
@@ -797,16 +813,8 @@ void Client::projectClosed(ProjectExplorer::Project *project)
             m_state = Shutdown; // otherwise the manager would try to restart this server
             emit finished();
         }
+        m_project = nullptr;
     }
-    if (!sendWorkspceFolderChanges())
-        return;
-    WorkspaceFoldersChangeEvent event;
-    event.setRemoved({WorkSpaceFolder(DocumentUri::fromFilePath(project->projectDirectory()),
-                                      project->displayName())});
-    DidChangeWorkspaceFoldersParams params;
-    params.setEvent(event);
-    DidChangeWorkspaceFoldersNotification change(params);
-    sendContent(change);
 }
 
 void Client::setSupportedLanguage(const LanguageFilter &filter)
@@ -1260,6 +1268,8 @@ void Client::shutDownCallback(const ShutdownRequest::Response &shutdownResponse)
 
 bool Client::sendWorkspceFolderChanges() const
 {
+    if (!reachable())
+        return false;
     if (m_dynamicCapabilities.isRegistered(
                 DidChangeWorkspaceFoldersNotification::methodName).value_or(false)) {
         return true;
diff --git a/src/plugins/languageclient/client.h b/src/plugins/languageclient/client.h
index 0065779e3f3..e3edbf88b52 100644
--- a/src/plugins/languageclient/client.h
+++ b/src/plugins/languageclient/client.h
@@ -87,7 +87,7 @@ public:
     // basic properties
     Utils::Id id() const { return m_id; }
     void setName(const QString &name) { m_displayName = name; }
-    QString name() const { return m_displayName; }
+    QString name() const;
     void sendContent(const LanguageServerProtocol::IContent &content);
     void cancelRequest(const LanguageServerProtocol::MessageId &id);
 
@@ -134,10 +134,10 @@ public:
     bool documentUpdatePostponed(const Utils::FilePath &fileName) const;
 
     // workspace control
-    void setCurrentProject(ProjectExplorer::Project *project);
+    virtual void setCurrentProject(ProjectExplorer::Project *project);
     const ProjectExplorer::Project *project() const;
-    void projectOpened(ProjectExplorer::Project *project);
-    void projectClosed(ProjectExplorer::Project *project);
+    virtual void projectOpened(ProjectExplorer::Project *project);
+    virtual void projectClosed(ProjectExplorer::Project *project);
 
     // commands
     void requestCodeActions(const LanguageServerProtocol::DocumentUri &uri,
diff --git a/src/plugins/languageclient/languageclientinterface.cpp b/src/plugins/languageclient/languageclientinterface.cpp
index 91d2562e672..be1f2bdb20c 100644
--- a/src/plugins/languageclient/languageclientinterface.cpp
+++ b/src/plugins/languageclient/languageclientinterface.cpp
@@ -89,9 +89,7 @@ void BaseClientInterface::parseData(const QByteArray &data)
     }
 }
 
-StdIOClientInterface::StdIOClientInterface(const QString &executable, const QString &arguments)
-    : m_executable(executable)
-    , m_arguments(arguments)
+StdIOClientInterface::StdIOClientInterface()
 {
     connect(&m_process, &QProcess::readyReadStandardError,
             this, &StdIOClientInterface::readError);
@@ -99,9 +97,6 @@ StdIOClientInterface::StdIOClientInterface(const QString &executable, const QStr
             this, &StdIOClientInterface::readOutput);
     connect(&m_process, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
             this, &StdIOClientInterface::onProcessFinished);
-
-    m_process.setArguments(Utils::QtcProcess::splitArgs(m_arguments));
-    m_process.setProgram(m_executable);
 }
 
 StdIOClientInterface::~StdIOClientInterface()
@@ -109,11 +104,6 @@ StdIOClientInterface::~StdIOClientInterface()
     Utils::SynchronousProcess::stopProcess(m_process);
 }
 
-bool StdIOClientInterface::needsRestart(const StdIOSettings *settings) const
-{
-    return m_executable != settings->m_executable || m_arguments != settings->arguments();
-}
-
 bool StdIOClientInterface::start()
 {
     m_process.start();
@@ -124,6 +114,16 @@ bool StdIOClientInterface::start()
     return true;
 }
 
+void StdIOClientInterface::setExecutable(const QString &executable)
+{
+    m_process.setProgram(executable);
+}
+
+void StdIOClientInterface::setArguments(const QString &arguments)
+{
+    m_process.setArguments(Utils::QtcProcess::splitArgs(arguments));
+}
+
 void StdIOClientInterface::setWorkingDirectory(const QString &workingDirectory)
 {
     m_process.setWorkingDirectory(workingDirectory);
diff --git a/src/plugins/languageclient/languageclientinterface.h b/src/plugins/languageclient/languageclientinterface.h
index 182965ab882..69055bc49e4 100644
--- a/src/plugins/languageclient/languageclientinterface.h
+++ b/src/plugins/languageclient/languageclientinterface.h
@@ -25,6 +25,8 @@
 
 #pragma once
 
+#include "languageclient_global.h"
+
 #include <languageserverprotocol/basemessage.h>
 
 #include <QBuffer>
@@ -34,13 +36,13 @@ namespace LanguageClient {
 
 class StdIOSettings;
 
-class BaseClientInterface : public QObject
+class LANGUAGECLIENT_EXPORT BaseClientInterface : public QObject
 {
     Q_OBJECT
 public:
     BaseClientInterface();
 
-    virtual ~BaseClientInterface();
+    ~BaseClientInterface() override;
 
     void sendMessage(const LanguageServerProtocol::BaseMessage &message);
     virtual bool start() { return true; }
@@ -61,23 +63,23 @@ private:
     LanguageServerProtocol::BaseMessage m_currentMessage;
 };
 
-class StdIOClientInterface : public BaseClientInterface
+class LANGUAGECLIENT_EXPORT StdIOClientInterface : public BaseClientInterface
 {
     Q_OBJECT
 public:
-    StdIOClientInterface(const QString &executable, const QString &arguments);
+    StdIOClientInterface();
     ~StdIOClientInterface() override;
 
-    StdIOClientInterface() = delete;
     StdIOClientInterface(const StdIOClientInterface &) = delete;
     StdIOClientInterface(StdIOClientInterface &&) = delete;
     StdIOClientInterface &operator=(const StdIOClientInterface &) = delete;
     StdIOClientInterface &operator=(StdIOClientInterface &&) = delete;
 
-    bool needsRestart(const StdIOSettings *settings) const;
-
     bool start() override;
 
+    // These functions only have an effect if they are called before start
+    void setExecutable(const QString &executable);
+    void setArguments(const QString &arguments);
     void setWorkingDirectory(const QString &workingDirectory);
 
 protected:
@@ -88,9 +90,6 @@ private:
     void readError();
     void readOutput();
     void onProcessFinished(int exitCode, QProcess::ExitStatus exitStatus);
-
-    const QString m_executable;
-    const QString m_arguments;
 };
 
 } // namespace LanguageClient
diff --git a/src/plugins/languageclient/languageclientmanager.cpp b/src/plugins/languageclient/languageclientmanager.cpp
index d09edb78771..2f69bada526 100644
--- a/src/plugins/languageclient/languageclientmanager.cpp
+++ b/src/plugins/languageclient/languageclientmanager.cpp
@@ -472,13 +472,17 @@ void LanguageClientManager::documentOpened(Core::IDocument *document)
                         continue;
 
                     // check whether we already have a client running for this project
-                    if (Utils::findOrDefault(clients,
-                                             [project](const QPointer<Client> &client) {
-                                                 return client->project() == project;
-                                             })) {
-                        continue;
+                    Client *clientForProject = Utils::findOrDefault(clients,
+                                                                    [project](Client *client) {
+                                                                        return client->project()
+                                                                               == project;
+                                                                    });
+                    if (!clientForProject) {
+                        clientForProject = startClient(setting, project);
+                        clients << clientForProject;
                     }
-                    clients << startClient(setting, project);
+                    QTC_ASSERT(clientForProject, continue);
+                    openDocumentWithClient(textDocument, clientForProject);
                 }
             } else if (setting->m_startBehavior == BaseSettings::RequiresFile && clients.isEmpty()) {
                 clients << startClient(setting);
diff --git a/src/plugins/languageclient/languageclientsettings.cpp b/src/plugins/languageclient/languageclientsettings.cpp
index 030fefef3d8..fff4b3d9c0e 100644
--- a/src/plugins/languageclient/languageclientsettings.cpp
+++ b/src/plugins/languageclient/languageclientsettings.cpp
@@ -722,7 +722,10 @@ Utils::CommandLine StdIOSettings::command() const
 
 BaseClientInterface *StdIOSettings::createInterface() const
 {
-    return new StdIOClientInterface(m_executable, arguments());
+    auto interface = new StdIOClientInterface;
+    interface->setExecutable(m_executable);
+    interface->setArguments(arguments());
+    return interface;
 }
 
 class JsonTreeItemDelegate : public QStyledItemDelegate
diff --git a/src/plugins/projectexplorer/outputparser_test.cpp b/src/plugins/projectexplorer/outputparser_test.cpp
index d1d25a3c67b..a70a33a8d88 100644
--- a/src/plugins/projectexplorer/outputparser_test.cpp
+++ b/src/plugins/projectexplorer/outputparser_test.cpp
@@ -62,7 +62,7 @@ void OutputParserTester::testParsing(const QString &lines,
 {
     const auto terminator = new TestTerminator(this);
     if (!lineParsers().isEmpty())
-        terminator->setRedirectionDetector(lineParsers().last());
+        terminator->setRedirectionDetector(lineParsers().constLast());
     addLineParser(terminator);
     reset();
 
@@ -113,7 +113,7 @@ TestTerminator::TestTerminator(OutputParserTester *t) :
     m_tester(t)
 {
     if (!t->lineParsers().isEmpty()) {
-        for (const Utils::FilePath &searchDir : t->lineParsers().first()->searchDirectories())
+        for (const Utils::FilePath &searchDir : t->lineParsers().constFirst()->searchDirectories())
             addSearchDir(searchDir);
     }
 }
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.cpp b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.cpp
index fbb2eee9f35..1845c025400 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.cpp
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.cpp
@@ -96,6 +96,18 @@ QHash<int, QByteArray> ItemLibraryCategoriesModel::roleNames() const
     return m_roleNames;
 }
 
+void ItemLibraryCategoriesModel::expandCategories(bool expand)
+{
+    int i = 0;
+    for (const auto &category : std::as_const(m_categoryList)) {
+        if (category->categoryExpanded() != expand) {
+            category->setExpanded(expand);
+            emit dataChanged(index(i), index(i), {m_roleNames.key("categoryExpanded")});
+        }
+        ++i;
+    }
+}
+
 void ItemLibraryCategoriesModel::addCategory(ItemLibraryCategory *category)
 {
     m_categoryList.append(category);
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.h b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.h
index fb1a7e0e050..982083569d0 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.h
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategoriesmodel.h
@@ -48,6 +48,7 @@ public:
     QHash<int, QByteArray> roleNames() const override;
 
     void addCategory(ItemLibraryCategory *category);
+    void expandCategories(bool expand = true);
 
     const QList<QPointer<ItemLibraryCategory>> &categorySections() const;
 
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategory.cpp b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategory.cpp
index cb244839bd0..1662b0ce966 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategory.cpp
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarycategory.cpp
@@ -78,6 +78,10 @@ bool ItemLibraryCategory::updateItemVisibility(const QString &searchText, bool *
             hasVisibleItems = true;
     }
 
+    // expand category if it has an item matching search criteria
+    if (hasVisibleItems && !categoryExpanded())
+        setExpanded(true);
+
     return hasVisibleItems;
 }
 
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.cpp b/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.cpp
index 41483535c5a..f2f22b1b74f 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.cpp
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.cpp
@@ -80,25 +80,28 @@ QObject *ItemLibraryImport::categoryModel()
     return &m_categoryModel;
 }
 
+void ItemLibraryImport::expandCategories(bool expand)
+{
+    m_categoryModel.expandCategories(expand);
+}
+
 bool ItemLibraryImport::updateCategoryVisibility(const QString &searchText, bool *changed)
 {
-    bool hasVisibleItems = false;
-
+    bool hasVisibleCategories = false;
     *changed = false;
 
     for (const auto &category : m_categoryModel.categorySections()) {
         bool categoryChanged = false;
-        hasVisibleItems = category->updateItemVisibility(searchText, &categoryChanged);
+        bool hasVisibleItems = category->updateItemVisibility(searchText, &categoryChanged);
         categoryChanged |= category->setVisible(hasVisibleItems);
 
         *changed |= categoryChanged;
-        *changed |= hasVisibleItems;
+
+        if (hasVisibleItems)
+            hasVisibleCategories = true;
     }
 
-    if (*changed)
-        m_categoryModel.resetModel();
-
-    return hasVisibleItems;
+    return hasVisibleCategories;
 }
 
 Import ItemLibraryImport::importEntry() const
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.h b/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.h
index 8db549c3ae5..c922e984084 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.h
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibraryimport.h
@@ -63,6 +63,7 @@ public:
     void setImportUsed(bool importUsed);
     void sortCategorySections();
     void setImportExpanded(bool expanded = true);
+    void expandCategories(bool expand = true);
 
     static QString userComponentsTitle();
 
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.cpp b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.cpp
index c88ebb67e96..25bef1edd4b 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.cpp
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.cpp
@@ -61,34 +61,28 @@ bool ItemLibraryModel::loadExpandedState(const QString &sectionName)
 
 void ItemLibraryModel::expandAll()
 {
-    bool changed = false;
+    int i = 0;
     for (const QPointer<ItemLibraryImport> &import : std::as_const(m_importList)) {
-        if (import->hasCategories() && !import->importExpanded()) {
-            changed = true;
+        if (!import->importExpanded()) {
             import->setImportExpanded();
+            emit dataChanged(index(i), index(i), {m_roleNames.key("importExpanded")});
             saveExpandedState(true, import->importUrl());
         }
-    }
-
-    if (changed) {
-        beginResetModel();
-        endResetModel();
+        import->expandCategories(true);
+        ++i;
     }
 }
 
 void ItemLibraryModel::collapseAll()
 {
-    bool changed = false;
+    int i = 0;
     for (const QPointer<ItemLibraryImport> &import : std::as_const(m_importList)) {
         if (import->hasCategories() && import->importExpanded()) {
-            changed = true;
             import->setImportExpanded(false);
+            emit dataChanged(index(i), index(i), {m_roleNames.key("importExpanded")});
             saveExpandedState(false, import->importUrl());
         }
-    }
-    if (changed) {
-        beginResetModel();
-        endResetModel();
+        ++i;
     }
 }
 
@@ -329,9 +323,18 @@ void ItemLibraryModel::updateVisibility(bool *changed)
 {
     for (ItemLibraryImport *import : std::as_const(m_importList)) {
         bool categoryChanged = false;
-        import->updateCategoryVisibility(m_searchText, &categoryChanged);
+        bool hasVisibleItems = import->updateCategoryVisibility(m_searchText, &categoryChanged);
 
         *changed |= categoryChanged;
+
+        // expand import if it has an item matching search criteria
+        if (hasVisibleItems && !import->importExpanded())
+            import->setImportExpanded();
+    }
+
+    if (changed) {
+        beginResetModel();
+        endResetModel();
     }
 }
 
diff --git a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp
index ea80e211132..9fdef025483 100644
--- a/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp
+++ b/src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp
@@ -275,6 +275,7 @@ void ItemLibraryWidget::handleAddImport(int index)
     m_model->changeImports({import}, {});
     QmlDesignerPlugin::instance()->currentDesignDocument()->updateSubcomponentManager();
     m_stackedWidget->setCurrentIndex(0); // switch to the Components view after import is added
+    updateSearch();
 }
 
 void ItemLibraryWidget::delayedUpdateModel()
diff --git a/src/plugins/qmldesigner/designercore/imagecache/imagecachestorage.h b/src/plugins/qmldesigner/designercore/imagecache/imagecachestorage.h
index 2d5d87ab48b..f34dd2fca4b 100644
--- a/src/plugins/qmldesigner/designercore/imagecache/imagecachestorage.h
+++ b/src/plugins/qmldesigner/designercore/imagecache/imagecachestorage.h
@@ -134,7 +134,7 @@ public:
         }
     }
 
-    void storeIcon(Utils::SmallStringView name, Sqlite::TimeStamp newTimeStamp, const QIcon &icon)
+    void storeIcon(Utils::SmallStringView name, Sqlite::TimeStamp newTimeStamp, const QIcon &icon) override
     {
         try {
             Sqlite::ImmediateTransaction transaction{database};
diff --git a/src/plugins/qmldesigner/designercore/metainfo/subcomponentmanager.cpp b/src/plugins/qmldesigner/designercore/metainfo/subcomponentmanager.cpp
index 0c759c59ced..876bf27074b 100644
--- a/src/plugins/qmldesigner/designercore/metainfo/subcomponentmanager.cpp
+++ b/src/plugins/qmldesigner/designercore/metainfo/subcomponentmanager.cpp
@@ -337,7 +337,9 @@ void SubComponentManager::registerQmlFile(const QFileInfo &fileInfo, const QStri
         ItemLibraryEntry itemLibraryEntry;
         itemLibraryEntry.setType(componentName.toUtf8());
         itemLibraryEntry.setName(baseComponentName);
+#ifndef QMLDESIGNER_TEST
         itemLibraryEntry.setCategory(ItemLibraryImport::userComponentsTitle());
+#endif
         itemLibraryEntry.setCustomComponentSource(fileInfo.absoluteFilePath());
         if (!qualifier.isEmpty()) {
             itemLibraryEntry.setRequiredImport(fixedQualifier);
diff --git a/tests/auto/qml/reformatter/jssyntax.js b/tests/auto/qml/reformatter/jssyntax.js
index edba1a406cf..b6c2a9e9054 100644
--- a/tests/auto/qml/reformatter/jssyntax.js
+++ b/tests/auto/qml/reformatter/jssyntax.js
@@ -12,6 +12,17 @@ function foo(a, b) {
 
 var foo = function (a, b) {}
 
+function spread() {
+    iterableObj = [1, 2]
+    obj = {
+        "a": 42
+    }
+    foo(...iterableObj)
+    let arr = [...iterableObj, '4', 'five', 6]
+    foo(-1, ...args, 2, ...[3])
+    console.log(Math.max(...[1, 2, 3, 4]))
+}
+
 const func1 = x => x * 2
 const func2 = x => {
     return x * 7