Which styles the knob works on; see stylingKnobAppliesTo.
Whether the knob has anything to work on in the loaded style. false means setting it would
do nothing — the SDK also warns once in the console when that happens. Check this before
offering the knob in a UI or to an agent.
The value in effect right now: the override if there is one, otherwise the default.
The value the loaded style ships with. undefined when the style defines it as a data-driven
expression that no single value stands for; reset still restores it exactly.
The knob's id, as accepted by StylingModule.set.
Optionalrange?: StylingKnobRangeThe range of valid values, for factor and number knobs.
Narrows the shared KnobDescriptor: styling ids and value types are known, range.step is
always given, and available / appliesTo are required — every styling knob answers both.
One entry of the styling catalogue returned by StylingModule.describe: everything a UI or an agent needs to offer the knob, validate a value for it and show its state.