Declaring UI type involves defining and implementing consistent typographic styles across your user interface. Start by establishing a typographic hierarchy that prioritizes content and guides users' attention through the interface. Define styles for headings, body text, and other typographic elements, ensuring consistency in font size, weight, and spacing. Dive into Figma's text styles to create reusable typographic styles that can be applied consistently throughout your designs. Consider accessibility principles when declaring UI type, ensuring sufficient contrast and legibility for all users. By declaring UI type effectively, you can create interfaces that are not only visually appealing but also easy to navigate and understand.