src/vs/editor/contrib/unicodeHighlighter/browser/bannerController.ts/Banner/getAriaLabel
class Banner:	private getAriaLabel(item: IBannerItem): string | undefined {
		if (item.ariaLabel) {
			return item.ariaLabel;
		}
		if (typeof item.message === 'string') {
			return item.message;
		}

		return undefined;
	}