diff --git a/src/libs/qmljs/parser/qmldirparser.cpp b/src/libs/qmljs/parser/qmldirparser.cpp
index 747d2010f3..e9d22624ef 100644
--- a/src/libs/qmljs/parser/qmldirparser.cpp
+++ b/src/libs/qmljs/parser/qmldirparser.cpp
@@ -25,14 +25,10 @@
 
 #include "qmldirparser_p.h"
 
-#include <utils/qtcassert.h>
-
 #include <QtCore/QtDebug>
 
 QT_QML_BEGIN_NAMESPACE
 
-using namespace LanguageUtils;
-
 static int parseInt(QStringView str, bool *ok)
 {
     int pos = 0;
@@ -50,45 +46,19 @@ static int parseInt(QStringView str, bool *ok)
     return number;
 }
 
-static bool parseVersion(const QString &str, int *major, int *minor)
+static QTypeRevision parseVersion(const QString &str)
 {
     const int dotIndex = str.indexOf(QLatin1Char('.'));
     if (dotIndex != -1 && str.indexOf(QLatin1Char('.'), dotIndex + 1) == -1) {
         bool ok = false;
-        *major = parseInt(QStringView(str.constData(), dotIndex), &ok);
-        if (ok)
-            *minor = parseInt(QStringView(str.constData() + dotIndex + 1, str.length() - dotIndex - 1),
-                              &ok);
-        return ok;
-    }
-    return false;
-}
-
-static ComponentVersion parseImportVersion(const QString &str)
-{
-    int minor = -1;
-    int major = -1;
-    const int dotIndex = str.indexOf(QLatin1Char('.'));
-    bool ok = false;
-    if (dotIndex != -1 && str.indexOf(QLatin1Char('.'), dotIndex + 1) == -1) {
-        major = parseInt(QStringView(str.constData(), dotIndex), &ok);
-        if (ok) {
-            if (str.length() > dotIndex + 1) {
-                minor = parseInt(QStringView(str.constData() + dotIndex + 1, str.length() - dotIndex - 1),
-                                 &ok);
-                if (!ok)
-                    minor = ComponentVersion::NoVersion;
-            } else {
-                minor = ComponentVersion::MaxVersion;
-            }
-        }
-    } else if (str.length() > 0) {
-        QTC_ASSERT(str != QLatin1String("auto"), return ComponentVersion(-1, -1));
-        major = parseInt(QStringView(str.constData(), str.length()),
-                         &ok);
-        minor = ComponentVersion::MaxVersion;
+        const int major = parseInt(QStringView(str).left(dotIndex), &ok);
+        if (!ok)
+            return QTypeRevision();
+        const int minor = parseInt(QStringView(str).mid(dotIndex + 1, str.length() - dotIndex - 1),
+                                   &ok);
+        return ok ? QTypeRevision::fromVersion(major, minor) : QTypeRevision();
     }
-    return ComponentVersion(major, minor);
+    return QTypeRevision();
 }
 
 void QmlDirParser::clear()
@@ -132,12 +102,12 @@ bool QmlDirParser::parse(const QString &source)
     auto readImport = [&](const QString *sections, int sectionCount, Import::Flags flags) {
         Import import;
         if (sectionCount == 2) {
-            import = Import(sections[1], ComponentVersion(), flags);
+            import = Import(sections[1], QTypeRevision(), flags);
         } else if (sectionCount == 3) {
             if (sections[2] == QLatin1String("auto")) {
-                import = Import(sections[1], ComponentVersion(), flags | Import::Auto);
+                import = Import(sections[1], QTypeRevision(), flags | Import::Auto);
             } else {
-                const auto version = parseImportVersion(sections[2]);
+                const auto version = parseVersion(sections[2]);
                 if (version.isValid()) {
                     import = Import(sections[1], version, flags);
                 } else {
@@ -275,7 +245,7 @@ bool QmlDirParser::parse(const QString &source)
                             QStringLiteral("internal types require 2 arguments, but %1 were provided").arg(sectionCount - 1));
                 continue;
             }
-            Component entry(sections[1], sections[2], -1, -1);
+            Component entry(sections[1], sections[2], QTypeRevision());
             entry.internal = true;
             _components.insert(entry.typeName, entry);
         } else if (sections[0] == QLatin1String("singleton")) {
@@ -286,16 +256,16 @@ bool QmlDirParser::parse(const QString &source)
             } else if (sectionCount == 3) {
                 // handle qmldir directory listing case where singleton is defined in the following pattern:
                 // singleton TestSingletonType TestSingletonType.qml
-                Component entry(sections[1], sections[2], -1, -1);
+                Component entry(sections[1], sections[2], QTypeRevision());
                 entry.singleton = true;
                 _components.insert(entry.typeName, entry);
             } else {
                 // handle qmldir module listing case where singleton is defined in the following pattern:
                 // singleton TestSingletonType 2.0 TestSingletonType20.qml
-                int major, minor;
-                if (parseVersion(sections[2], &major, &minor)) {
+                const QTypeRevision version = parseVersion(sections[2]);
+                if (version.isValid()) {
                     const QString &fileName = sections[3];
-                    Component entry(sections[1], fileName, major, minor);
+                    Component entry(sections[1], fileName, version);
                     entry.singleton = true;
                     _components.insert(entry.typeName, entry);
                 } else {
@@ -361,19 +331,19 @@ bool QmlDirParser::parse(const QString &source)
             _linkTarget = sections[1];
         } else if (sectionCount == 2) {
             // No version specified (should only be used for relative qmldir files)
-            const Component entry(sections[0], sections[1], -1, -1);
+            const Component entry(sections[0], sections[1], QTypeRevision());
             _components.insert(entry.typeName, entry);
         } else if (sectionCount == 3) {
-            int major, minor;
-            if (parseVersion(sections[1], &major, &minor)) {
+            const QTypeRevision version = parseVersion(sections[1]);
+            if (version.isValid()) {
                 const QString &fileName = sections[2];
 
                 if (fileName.endsWith(QLatin1String(".js")) || fileName.endsWith(QLatin1String(".mjs"))) {
                     // A 'js' extension indicates a namespaced script import
-                    const Script entry(sections[0], fileName, major, minor);
+                    const Script entry(sections[0], fileName, version);
                     _scripts.append(entry);
                 } else {
-                    const Component entry(sections[0], fileName, major, minor);
+                    const Component entry(sections[0], fileName, version);
                     _components.insert(entry.typeName, entry);
                 }
             } else {
@@ -420,15 +390,19 @@ QList<QmlJS::DiagnosticMessage> QmlDirParser::errors(const QString &uri) const
 
 QDebug &operator<< (QDebug &debug, const QmlDirParser::Component &component)
 {
-    const QString output = QStringLiteral("{%1 %2.%3}").
-        arg(component.typeName).arg(component.majorVersion).arg(component.minorVersion);
+    const QString output = QStringLiteral("{%1 %2.%3}")
+                               .arg(component.typeName)
+                               .arg(component.version.majorVersion())
+                               .arg(component.version.minorVersion());
     return debug << qPrintable(output);
 }
 
 QDebug &operator<< (QDebug &debug, const QmlDirParser::Script &script)
 {
-    const QString output = QStringLiteral("{%1 %2.%3}").
-        arg(script.nameSpace).arg(script.majorVersion).arg(script.minorVersion);
+    const QString output = QStringLiteral("{%1 %2.%3}")
+                               .arg(script.nameSpace)
+                               .arg(script.version.majorVersion())
+                               .arg(script.version.minorVersion());
     return debug << qPrintable(output);
 }
 
diff --git a/src/libs/qmljs/parser/qmldirparser_p.h b/src/libs/qmljs/parser/qmldirparser_p.h
index d5a0aabfd0..c1869b7cc8 100644
--- a/src/libs/qmljs/parser/qmldirparser_p.h
+++ b/src/libs/qmljs/parser/qmldirparser_p.h
@@ -36,15 +36,12 @@
 // We mean it.
 //
 
-#include <QtCore/QUrl>
-#include <QtCore/QHash>
-#include <QtCore/QDebug>
-
-#include <languageutils/componentversion.h>
-
-#include "qmljs/parser/qmljsglobal_p.h"
-#include "qmljs/parser/qmljsengine_p.h"
 #include "qmljs/parser/qmljsdiagnosticmessage_p.h"
+#include "qmljs/parser/qmljsglobal_p.h"
+#include <QtCore/QDebug>
+#include <QtCore/QHash>
+#include <QtCore/QTypeRevision>
+#include <QtCore/QUrl>
 
 QT_QML_BEGIN_NAMESPACE
 
@@ -90,17 +87,19 @@ public:
     {
         Component() = default;
 
-        Component(const QString &typeName, const QString &fileName, int majorVersion, int minorVersion)
-            : typeName(typeName), fileName(fileName), majorVersion(majorVersion), minorVersion(minorVersion),
-            internal(false), singleton(false)
+        Component(const QString &typeName, const QString &fileName, QTypeRevision version)
+            : typeName(typeName)
+            , fileName(fileName)
+            , version(version)
+            , internal(false)
+            , singleton(false)
         {
             checkNonRelative("Component", typeName, fileName);
         }
 
         QString typeName;
         QString fileName;
-        int majorVersion = 0;
-        int minorVersion = 0;
+        QTypeRevision version = QTypeRevision::zero();
         bool internal = false;
         bool singleton = false;
     };
@@ -109,16 +108,17 @@ public:
     {
         Script() = default;
 
-        Script(const QString &nameSpace, const QString &fileName, int majorVersion, int minorVersion)
-            : nameSpace(nameSpace), fileName(fileName), majorVersion(majorVersion), minorVersion(minorVersion)
+        Script(const QString &nameSpace, const QString &fileName, QTypeRevision version)
+            : nameSpace(nameSpace)
+            , fileName(fileName)
+            , version(version)
         {
             checkNonRelative("Script", nameSpace, fileName);
         }
 
         QString nameSpace;
         QString fileName;
-        int majorVersion = 0;
-        int minorVersion = 0;
+        QTypeRevision version = QTypeRevision::zero();
     };
 
     struct Import
@@ -131,13 +131,15 @@ public:
         Q_DECLARE_FLAGS(Flags, Flag)
 
         Import() = default;
-        Import(QString module, LanguageUtils::ComponentVersion version, Flags flags)
-            : module(module), version(version), flags(flags)
+        Import(QString module, QTypeRevision version, Flags flags)
+            : module(module)
+            , version(version)
+            , flags(flags)
         {
         }
 
         QString module;
-        LanguageUtils::ComponentVersion version;     // invalid version is latest version, unless Flag::Auto
+        QTypeRevision version; // invalid version is latest version, unless Flag::Auto
         Flags flags;
     };
 
diff --git a/src/libs/qmljs/parser/qmlimportresolver.cpp b/src/libs/qmljs/parser/qmlimportresolver.cpp
index e74c5840c1..e7416ef7f0 100644
--- a/src/libs/qmljs/parser/qmlimportresolver.cpp
+++ b/src/libs/qmljs/parser/qmlimportresolver.cpp
@@ -40,20 +40,20 @@ enum ImportVersion { FullyVersioned, PartiallyVersioned, Unversioned };
     - base/QtQml.2/Models
     - base/QtQml/Models
 */
-QStringList qQmlResolveImportPaths(QStringView uri, const QStringList &basePaths,
-                                   LanguageUtils::ComponentVersion version)
+QStringList qQmlResolveImportPaths(QStringView uri,
+                                   const QStringList &basePaths,
+                                   QTypeRevision version)
 {
     static const QLatin1Char Slash('/');
     static const QLatin1Char Backslash('\\');
 
-    const QList<QStringView> parts = uri.split(u'.', Qt::SkipEmptyParts);
+    const QVector<QStringView> parts = uri.split(u'.', Qt::SkipEmptyParts);
 
     QStringList importPaths;
     // fully & partially versioned parts + 1 unversioned for each base path
     importPaths.reserve(2 * parts.count() + 1);
 
-    auto versionString = [](LanguageUtils::ComponentVersion version, ImportVersion mode)
-    {
+    auto versionString = [](QTypeRevision version, ImportVersion mode) {
         if (mode == FullyVersioned) {
             // extension with fully encoded version number (eg. MyModule.3.2)
             return QString::fromLatin1(".%1.%2").arg(version.majorVersion())
@@ -67,7 +67,7 @@ QStringList qQmlResolveImportPaths(QStringView uri, const QStringList &basePaths
         return QString();
     };
 
-    auto joinStringRefs = [](const QList<QStringView> &refs, const QChar &sep) {
+    auto joinStringRefs = [](const QVector<QStringView> &refs, const QChar &sep) {
         QString str;
         for (auto it = refs.cbegin(); it != refs.cend(); ++it) {
             if (it != refs.cbegin())
@@ -77,9 +77,10 @@ QStringList qQmlResolveImportPaths(QStringView uri, const QStringList &basePaths
         return str;
     };
 
-    const ImportVersion initial = ((version.minorVersion() >= 0)
-            ? FullyVersioned
-                                   : ((version.majorVersion() >= 0) ? PartiallyVersioned : Unversioned));
+    const ImportVersion initial = (version.hasMinorVersion())
+                                      ? FullyVersioned
+                                      : (version.hasMajorVersion() ? PartiallyVersioned
+                                                                   : Unversioned);
     for (int mode = initial; mode <= Unversioned; ++mode) {
         const QString ver = versionString(version, ImportVersion(mode));
 
diff --git a/src/libs/qmljs/parser/qmlimportresolver_p.h b/src/libs/qmljs/parser/qmlimportresolver_p.h
index 68c052d408..8f18de3d0b 100644
--- a/src/libs/qmljs/parser/qmlimportresolver_p.h
+++ b/src/libs/qmljs/parser/qmlimportresolver_p.h
@@ -40,11 +40,12 @@
 
 #include "qmljsglobal_p.h"
 #include <QtCore/qstring.h>
-#include <languageutils/componentversion.h>
+#include <QtCore/qversionnumber.h>
 
 QT_QML_BEGIN_NAMESPACE
 
-QML_PARSER_EXPORT QStringList qQmlResolveImportPaths(QStringView uri, const QStringList &basePaths,
-                                   LanguageUtils::ComponentVersion version);
+QML_PARSER_EXPORT QStringList qQmlResolveImportPaths(QStringView uri,
+                                                     const QStringList &basePaths,
+                                                     QTypeRevision version);
 
 QT_QML_END_NAMESPACE
diff --git a/src/libs/qmljs/parser/qmljs.g b/src/libs/qmljs/parser/qmljs.g
index 5f62edf4d1..19f4e200e5 100644
--- a/src/libs/qmljs/parser/qmljs.g
+++ b/src/libs/qmljs/parser/qmljs.g
@@ -381,7 +381,7 @@ public:
     inline DiagnosticMessage diagnosticMessage() const
     {
         for (const DiagnosticMessage &d : diagnostic_messages) {
-            if (d.kind != Severity::Warning)
+            if (d.type != QtWarningMsg)
                 return d;
         }
 
@@ -425,7 +425,7 @@ protected:
         DiagnosticMessage error;
         error.loc = location;
         error.message = message;
-        error.kind = DiagnosticMessage::qtMsgTypeToKind(kind);
+        error.type = kind;
         return error;
     }
 
@@ -446,8 +446,8 @@ protected:
     Value *sym_stack = nullptr;
     int *state_stack = nullptr;
     SourceLocation *location_stack = nullptr;
-    QVector<QStringView> string_stack;
-    QVector<QStringView> rawString_stack;
+    QList<QStringView> string_stack;
+    QList<QStringView> rawString_stack;
 
     AST::Node *program = nullptr;
 
@@ -849,7 +849,7 @@ UiVersionSpecifier: T_VERSION_NUMBER T_DOT T_VERSION_NUMBER;
     case $rule_number: {
         const int major = sym(1).dval;
         const int minor = sym(3).dval;
-        if (major < 0  || major >= 255 || minor < 0 || minor >= 255) {
+        if (!QTypeRevision::isValidSegment(major) || !QTypeRevision::isValidSegment(minor)) {
             diagnostic_messages.append(
                     compileError(loc(1),
                     QLatin1String("Invalid version. Version numbers must be >= 0 and < 255.")));
@@ -862,11 +862,12 @@ UiVersionSpecifier: T_VERSION_NUMBER T_DOT T_VERSION_NUMBER;
     } break;
 ./
 
+
 UiVersionSpecifier: T_VERSION_NUMBER;
 /.
     case $rule_number: {
         const int major = sym(1).dval;
-        if (major < 0 || major >= 255) {
+        if (!QTypeRevision::isValidSegment(major)) {
             diagnostic_messages.append(
                     compileError(loc(1),
                     QLatin1String("Invalid major version. Version numbers must be >= 0 and < 255.")));
diff --git a/src/libs/qmljs/parser/qmljsast_p.h b/src/libs/qmljs/parser/qmljsast_p.h
index 78b9f4b080..dcbcb5fd0d 100644
--- a/src/libs/qmljs/parser/qmljsast_p.h
+++ b/src/libs/qmljs/parser/qmljsast_p.h
@@ -654,12 +654,14 @@ class QML_PARSER_EXPORT UiVersionSpecifier : public Node
 public:
     QMLJS_DECLARE_AST_NODE(UiVersionSpecifier)
 
-    UiVersionSpecifier(int majorum) : majorVersion(majorum)
+    UiVersionSpecifier(int majorum)
+        : version(QTypeRevision::fromMajorVersion(majorum))
     {
         kind = K;
     }
 
-    UiVersionSpecifier(int majorum, int minorum) : majorVersion(majorum), minorVersion(minorum)
+    UiVersionSpecifier(int majorum, int minorum)
+        : version(QTypeRevision::fromVersion(majorum, minorum))
     {
         kind = K;
     }
@@ -674,8 +676,7 @@ public:
     }
 
     // attributes:
-    int majorVersion = -1;
-    int minorVersion = -1;
+    QTypeRevision version;
     SourceLocation majorToken;
     SourceLocation minorToken;
 };
@@ -881,14 +882,14 @@ struct QML_PARSER_EXPORT BoundName
     };
 
     QString id;
-    TypeAnnotation *typeAnnotation;
-    Type typeAnnotationType;
+    QTaggedPointer<TypeAnnotation, Type> typeAnnotation;
     BoundName(const QString &id, TypeAnnotation *typeAnnotation, Type type = Declared)
-    : id(id), typeAnnotation(typeAnnotation), typeAnnotationType(type)
+        : id(id)
+        , typeAnnotation(typeAnnotation, type)
     {}
     BoundName() = default;
     QString typeName() const { return typeAnnotation ? typeAnnotation->type->toString() : QString(); }
-    bool isInjected() const { return typeAnnotation && typeAnnotationType == Injected; }
+    bool isInjected() const { return typeAnnotation.tag() == Injected; }
 };
 
 struct BoundNames : public QVector<BoundName>
@@ -3486,7 +3487,6 @@ public:
     SourceLocation identifierToken;
     SourceLocation colonToken;
     SourceLocation semicolonToken;
-
 private:
     union {
         SourceLocation m_propertyToken = SourceLocation{};
diff --git a/src/libs/qmljs/parser/qmljslexer.cpp b/src/libs/qmljs/parser/qmljslexer.cpp
index 6c4eb70744..90f567d19c 100644
--- a/src/libs/qmljs/parser/qmljslexer.cpp
+++ b/src/libs/qmljs/parser/qmljslexer.cpp
@@ -27,6 +27,7 @@
 #include "qmljsengine_p.h"
 #include "qmljskeywords_p.h"
 
+#include "qmljs/parser/qlocale_tools_p.h"
 #include "qmljs/parser/qmljsdiagnosticmessage_p.h"
 #include "qmljs/parser/qmljsmemorypool_p.h"
 
@@ -35,14 +36,6 @@
 #include <QtCore/qdebug.h>
 #include <QtCore/QScopedValueRollback>
 
-QT_BEGIN_NAMESPACE
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-Q_CORE_EXPORT double qstrntod(const char *s00, int len, char const **se, bool *ok);
-#else
-Q_CORE_EXPORT double qstrntod(const char *s00, qsizetype len, char const **se, bool *ok);
-#endif
-QT_END_NAMESPACE
-
 using namespace QmlJS;
 
 static inline int regExpFlagFromChar(const QChar &ch)
diff --git a/src/libs/qmljs/parser/qmljslexer_p.h b/src/libs/qmljs/parser/qmljslexer_p.h
index a442748d74..dc7f7f7308 100644
--- a/src/libs/qmljs/parser/qmljslexer_p.h
+++ b/src/libs/qmljs/parser/qmljslexer_p.h
@@ -47,7 +47,7 @@ QT_QML_BEGIN_NAMESPACE
 namespace QmlJS {
 
 class Engine;
-class DiagnosticMessage;
+struct DiagnosticMessage;
 class Directives;
 
 class QML_PARSER_EXPORT Lexer: public QmlJSGrammar
diff --git a/src/libs/qmljs/parser/qmljssourcelocation_p.h b/src/libs/qmljs/parser/qmljssourcelocation_p.h
index 29be90fd9b..865c008f19 100644
--- a/src/libs/qmljs/parser/qmljssourcelocation_p.h
+++ b/src/libs/qmljs/parser/qmljssourcelocation_p.h
@@ -95,8 +95,11 @@ public:
 
     friend size_t qHash(const SourceLocation &location, size_t seed = 0)
     {
-        return (seed ^ (size_t(location.offset) << 8) ^ size_t(location.length)
-                ^ (size_t(location.startLine) << 16) ^ (size_t(location.startColumn) << 24));
+        return qHashMulti(seed,
+                          location.offset,
+                          location.length,
+                          location.startLine,
+                          location.startColumn);
     }
 
     friend bool operator==(const SourceLocation &a, const SourceLocation &b)