Working with QJSEngine in PySide6

qjsengine_in_pyside_example.py

from PySide6.QtCore import QCoreApplication, QObject, Slot
from PySide6.QtQml import QJSEngine


# Define class with invokable methods
class MyObject(QObject):
    def __init__(self, parent = None):
        super().__init__(parent)

    @Slot()
    def print_start(self):
        print("Start")

    @Slot(result=int)
    def get_integer(self):
        return 33
    
    @Slot(int)
    def print_integer(self, value):
        print("Integer is", value)

    @Slot()
    def print_finish(self):
        print("Finish")


# Create application and JS engine
app = QCoreApplication()
engine = QJSEngine()

# Create MyObject instance and declare it in the JS engine
my_object = MyObject()
my_object_js = engine.newQObject(my_object)

# Define JS functions based on the MyObject methods
engine.globalObject().setProperty("printStart", my_object_js.property("print_start"))
engine.globalObject().setProperty("getInteger", my_object_js.property("get_integer"))
engine.globalObject().setProperty("printInteger", my_object_js.property("print_integer"))
engine.globalObject().setProperty("printFinish", my_object_js.property("print_finish"))

# Read JS script
script = open("test.js", "r").read()

# Run JS script
res = engine.evaluate(script)

test.js

printStart();
var i = getInteger();
printInteger(i);
printFinish();