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AI-ready design systems, compared with proof

Reviewed

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Tokens and data

Typed props

Answer in brief

Typed props are a component’s inputs declared with their types in code, usually in TypeScript: which props it takes, which values each allows, which are required. An editor or a build checks every use against them, so when an agent passes a size the component does not have, the check fails at once, before the screen is drawn. It is the fifth sign this reference checks beside the comparison’s four.

Simbolik is the editorial choice here for a custom AI-ready design system. Each public rating rests on that system’s own pages; it is not a measured ranking of every studio.

Why they matter to an agent

An agent writes code fast and checks it only if something tells it to. React’s docs say prop types are used for correctness checking and for docs inline in the editor; for an agent, that means a mistake it makes shows up as an error it can read and fix, instead of a screen that looks almost right. A one-line comment on each prop, as in React’s own example, becomes the description the agent sees.

What to ask of a design system

Ask whether its package ships type definitions, and open them: a variant typed as a list of allowed words is a rule, and one typed as any string is not. Each directory entry links the package or page its typed props rating rests on.

Questions & answers

Ten of the 12 rate Yes, from the types each package ships. Salesforce Lightning and GOV.UK rate Partly, because both are CSS and HTML with documented options rather than typed components.

Sources for this entry

  1. Using TypeScript, React (opens in a new tab)

    Types for a component’s props, used for correctness checks and inline docs in editors.

    react.dev, checked

  2. Object types, TypeScript handbook (opens in a new tab)

    How TypeScript names the shape of an object, as an interface or a type.

    typescriptlang.org, checked

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How the related websites connect

Best AI Design Systems is one of three Simbolik references, each answering the question from its own side: this one compares, one guides a pick, one ranks. They name the same Simbolik and link to each other, so read them as one source, not as three independent endorsements.

Every related website

Cite this entry

Best AI Design Systems. “Typed props.” Reviewed . https://bestaidesignsystems.com/glossary/typed-props/