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diff --git a/src/qmlcompiler/qqmljsfunctioninitializer_p.h b/src/qmlcompiler/qqmljsfunctioninitializer_p.h
new file mode 100644
index 0000000000..424959a4fa
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+++ b/src/qmlcompiler/qqmljsfunctioninitializer_p.h
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+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef QQMLJSFUNCTIONINITIALIAZER_P_H
+#define QQMLJSFUNCTIONINITIALIAZER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#include <private/qqmljscompilepass_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_QMLCOMPILER_EXPORT QQmlJSFunctionInitializer
+{
+    Q_DISABLE_COPY_MOVE(QQmlJSFunctionInitializer)
+public:
+    QQmlJSFunctionInitializer(
+            const QQmlJSTypeResolver *typeResolver,
+            const QV4::CompiledData::Location &objectLocation,
+            const QV4::CompiledData::Location &scopeLocation)
+        : m_typeResolver(typeResolver)
+        , m_scopeType(typeResolver->scopeForLocation(scopeLocation))
+        , m_objectType(typeResolver->scopeForLocation(objectLocation))
+    {}
+
+    QQmlJSCompilePass::Function run(
+            const QV4::Compiler::Context *context,
+            const QString &propertyName, QQmlJS::AST::Node *astNode,
+            const QmlIR::Binding &irBinding,
+            QQmlJS::DiagnosticMessage *error);
+    QQmlJSCompilePass::Function run(
+            const QV4::Compiler::Context *context,
+            const QString &functionName, QQmlJS::AST::Node *astNode,
+            QQmlJS::DiagnosticMessage *error);
+
+private:
+    void populateSignature(
+            const QV4::Compiler::Context *context, QQmlJS::AST::FunctionExpression *ast,
+            QQmlJSCompilePass::Function *function, QQmlJS::DiagnosticMessage *error);
+
+    const QQmlJSTypeResolver *m_typeResolver = nullptr;
+    const QQmlJSScope::ConstPtr m_scopeType;
+    const QQmlJSScope::ConstPtr m_objectType;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLJSFUNCTIONINITIALIZER_P_H