Add QJSEngine::registerModule

Some applications that use JavaScript as a scripting language may want
to extend JS through C++ code. The current way to do that is with
global objects.
ES6 provides a better way of encapsulating code: modules.
registerModule() allows an application to provide a QJSValue as a named module.
Developers familiar with Node.js will find this very easy to use.

Example:
```c++
QJSValue num(666);
myEngine.registerModule("themarkofthebeast", num);
```
```js
import badnews from "themarkofthebeast";
```

[ChangeLog][QtQml][QJSEngine] Adds the ability to register QJSValues in
C++ as modules for importing in MJS files.

Change-Id: I0c98dcb746aa2aa15aa2ab3082129d106413a23b
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/qml/jsapi/qjsengine.h b/src/qml/jsapi/qjsengine.h
index ac79b30ebc..84730afe2b 100644
--- a/src/qml/jsapi/qjsengine.h
+++ b/src/qml/jsapi/qjsengine.h
@@ -71,6 +71,7 @@ public:
     QJSValue evaluate(const QString &program, const QString &fileName = QString(), int lineNumber = 1, QStringList *exceptionStackTrace = nullptr);
 
     QJSValue importModule(const QString &fileName);
+    bool registerModule(const QString &moduleName, const QJSValue &value);
 
     QJSValue newObject();
     QJSValue newSymbol(const QString &name);