wordpress - How to add new panel under "document" in Gutenberg

Question

I am trying to add a new component panel under document tab, like categories, featured image etc.

Answer 1

They've added the PluginDocumentSettingPanel SlotFill now.

const { registerPlugin } = wp.plugins
const { PluginDocumentSettingPanel } = wp.editPost
 
const PluginDocumentSettingPanelDemo = () => (
    <PluginDocumentSettingPanel
        name="custom-panel"
        title="Custom Panel"
        className="custom-panel"
    >
        Custom Panel Contents
    </PluginDocumentSettingPanel>
)
registerPlugin('plugin-document-setting-panel-demo', {
    render: PluginDocumentSettingPanelDemo
})