Pasting this code from the documentation on Accessing the Document does not work.
for (const node of figma.currentPage.selection) {
if ("opacity" in node) {
node.opacity *= 0.5
}
}
Cannot assign to ‘opacity’ because it is a read-only property
How to do it?
This happens because some nodes don’t allow opacity modification.
E.g. ConnectorNode (I guess it’s all nodes from FigJam): ConnectorNode · Figma Plugins
You need to ensure the node type is the one with not readonly opacity so TypeScript doesn’t give you a warning. You can filter selection to include only the node types your plugin accepts.
This problem occurs even with a simple RectangleNode that should allow setting opacity.
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