fillStyleId
The id of the PaintStyle object that the fills property of this node is linked to.
If the manifest contains"documentAccess": "dynamic-page", this property is read-only. Use setFillStyleIdAsync to update the style.
Supported on:
Signature
fillStyleId: string | figma.mixed
Remarks
This property can return figma.mixed if the node has multiple fills.properties. Text nodes can have multiple fills if some characters are colored differently than others.