[Interest] Import C++ types to Javascript

[Jason H]

Per http://doc.qt.io/qt-5/qtqml-javascript-imports.html

I am trying to in a JS file, import a class I made and exposed to QML via

hash.h:
class Hash :public QObject {
Q_OBJECT
...
QString sha1(QString str);
}

main(): 
qmlRegisterType<Hash>("MyLib", 1, 0, "Hash");

myfile.js:
.import MyLib 1.0 as MyLib

function myFunc(obj) {
    return MyLib.Hash.sha1(JSON.stringify(obj));
}

but what I get when I call it is:
qml: Parse Error: TypeError: Property 'sha1' of object [object Object] is not a function

What am I doing wrong?
JSON.Stringify-ing the MyLib or MyLib.Hash returns {}