Jonny Burch argued that design’s source of truth is moving from Figma to code. Édouard Wautier is already there. He wrote up a field report on how Dust’s design team prototypes directly in code.

After the initial analysis and quick sketchbook phase, when I need to give the idea shape and pressure-test it, I don’t open Figma. I open my development environment, pull the latest version of our repo, and create a branch. Then I ask an agent to scaffold a new prototype, and I describe what I’m trying to make.

The prototype isn’t a picture of the product—it’s built from the same design system components and tokens. So what is Wautier optimizing for at this stage?

At this point I mostly care about trying the idea and seeing whether the interaction holds. I’ll build small flows, prototype the transitions, and sanity-check the parts that static screens often hide (state changes, error cases, motion, empty states, keyboard/navigation/accessibility basics).

He’s honest about the trade-offs. You occasionally lose 30 minutes to a tooling issue. Prototypes can invite premature polish because they look real too early. And handoff clarity gets muddy—engineers aren’t always sure what’s prototype-only versus reusable.

Wautier’s closing:

More like clay than drafting: you shape, you test, you feel, you adjust — with an instantaneous feedback loop. The artifact is no longer a description of the thing. It starts to become the thing, or at least a runnable slice of it.

I believe this is the future.