main.js

const icon = '<circle cx="12" cy="12" r="9" fill="none" fill-rule="evenodd" stroke="currentColor" stroke-width="2"></circle>'

miro.onReady(() => {
	miro.initialize({
		extensionPoints: {
			bottomBar: {
				title: 'Board cleaner',
				svgIcon: icon,
				onClick: async () => {
					const authorized = await miro.isAuthorized()
					if (authorized) {
						clearAllContent()
					} else {
						miro.board.ui.openModal('not-authorized.html')
							.then(res => {
								if (res === 'success') {
									clearAllContent()
								}
							})
					}
				}
			}
		}
	})
})

async function clearAllContent() {
	// Show modal and wait for user choice
	let needToClear = confirm('Do you want delete all board content?')

	if (needToClear) {
		// Get all board objects
		let objects = await miro.board.widgets.get()

		// Delete all board objects
		await miro.board.widgets.deleteById(objects.map(object => object.id))

		// Display success
		miro.showNotification('Content has been deleted')
	}
}