What is the recommended way to create a model element (an AstNode) programatically?

[goto40]

What is the recommended way to create a model element (an AstNode) programatically?

I have a generator and I would like to create some artifical AstElements to pass to the generator.

• These objects shall be instances of an interface described by one grammar rule.
• These objects contain langium Reference attributes referencing other known model elements.

Example:

...
Definition: name=ID;
Property: definition=[Definition] value=INT;
...

In this example I would like to create a Property programatically and link it to a known Definition.

[spoenemann]

const property: Property = {
    $type: Property,
    definition: {
        ref: definition,
        $refText: definition.name,
        $refNode: undefined!      // This is currently mandatory
    },
    value: 1234
};
// Add the new node to the AST
container.properties.push(property);
linkContentToContainer(container);

We should make $refNode optional to better support programmatic construction.

[spoenemann]

👉 #774