Setting Skip Output as default value for QgsProcessingParameterFileDestination

Question

Is it possible to set the [Skip Output] behaviour as the default for a QgsProcessingParameterFileDestination parameter in a processing script?

I've tried using a None value for the defaultValue parameter, but it remains set as [Save to temporary file].

self.addParameter(
        QgsProcessingParameterFileDestination(
            self.EXPORT_PATH,
            'Export JSON file',
            fileFilter='JSON files (*.json)',
            optional=True,
            defaultValue=None
            
        )
    )

Answer 1

Only one parameter createByDefault=False was missing:

If createByDefault is false and the parameter is optional, then this destination output will not be created by default.

So, it is supposed to:

self.addParameter(
    QgsProcessingParameterFileDestination(
        name='output',
        description='Export JSON file',
        fileFilter='JSON files (*.json)',
        defaultValue=None,
        optional=True,
        createByDefault=False
        )
    )

The result will be the following: