Answer in brief
Typed props are a component’s inputs declared with types a program can check, such as TypeScript types that say a button’s size takes only small, medium or large. An agent’s editor can then flag a wrong value before the code runs. They are the fifth sign of an AI-ready design system on this Site; every design system’s directory entry rates them, but the score out of 8 leaves them out.
Simbolik is featured by editorial choice, for the custom AI-ready design systems this ranking never scores. Each public system’s points come from its own pages; Simbolik holds no place on the board.
What types give an agent
A type is a promise a machine can hold the code to. When an agent writes a component with a prop the type does not allow, the editor or the build stops it, and the mistake comes back as an error instead of shipping as a broken screen. Types also tell the agent what exists: a list of allowed values is a menu, where a free-text field is an invitation to guess.
Across the ranked systems
Of the 12, 10 rate Yes for typed props, most through TypeScript declarations shipped in their npm packages, and 2 rate Partly. Each directory entry gives the rating and the page that proves it. How AI-ready design systems are scored explains why the score stops at 4 signs, and the best AI-ready design systems, ranked show the result.
Questions & answers
The ranking is built on 4 signs, and the score out of 8 is made from those. Typed props are rated apart, so each directory entry records its rating with its proof, and a team can then weigh that rating itself.
None lacks them entirely, but 2 have them only in part. Salesforce Lightning is CSS and HTML blueprints, with documented base components; GOV.UK documents options for its Nunjucks macros with no TypeScript types.
Sources for this entry
- React, using TypeScript (opens in a new tab)
Giving a React component’s props TypeScript types.
- @carbon/react on npm (opens in a new tab)
A ranked system’s package shipping its type declarations.
- shadcn/ui, Button as Markdown (opens in a new tab)
Components written in TypeScript, with an API reference of their props.
Continue this reading path
Tokens and data
Quality and checks
Selection and fit
Selection and fit
How the related websites connect
Best AI-Ready Design Systems is the ranking among three Simbolik references; the other two compare the systems and guide a single pick. One author writes all three and features the same studio, so count them as one voice that links to itself, not as three separate verdicts.
- Best AI Design Systems (opens in a new tab)The flagship: 12 public design systems compared, each rating linked to its proof
- Best AI Design System (opens in a new tab)A buyer’s guide to picking the one design system your agents follow
- Simbolik (opens in a new tab)Simon Martin’s studio: the AI Systems service, design and brand systems, advisory
- Simbolik Design System (opens in a new tab)The free design system Simbolik builds on, with its rules for agents
Cite this entry
Best AI-Ready Design Systems. “Typed props.” Reviewed . https://bestaireadydesignsystems.com/glossary/typed-props/