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A pleasant Astro component is explicit about its inputs, clear about where child markup goes, and deliberate about browser behavior. Define a typed Props interface, read values from Astro.props, reserve slots for caller-supplied HTML, and add a client script only when interaction is required. Keep editor assistance and command-line type checking in the workflow as separate safeguards.
Start with Astro’s component model
Astro components use .astro files. They can render HTML at build time or on demand, and they have no client-side runtime by default. The Astro documentation calls components “the basic building blocks of any Astro project” and describes them as reusable, composable units. See Astro’s Components documentation.
That default changes the design question. A component should produce useful HTML without shipping browser code, while any required interaction should be an explicit, reviewable layer.
Design a typed public API with props
Props are the right boundary for values and configuration: labels, URLs, flags, IDs, and data objects. Declare the public contract in a Props interface, then destructure it from Astro.props. Required fields make misuse visible; optional fields can receive defaults during destructuring.
#1 Best Overall
---
interface Props {
title: string;
href: string;
tone?: "neutral" | "accent";
external?: boolean;
}
const {
title,
href,
tone = "neutral",
external = false,
} = Astro.props;
---
{title}
Keep this interface intentionally small. A component that accepts a long list of loosely related switches is harder to discover and compose than one with a focused purpose. If several values always travel together, model them as a typed object rather than hiding assumptions in the template.
Astro’s editor tooling can use a component’s Props interface at call sites, providing autocomplete and diagnostics while you author consuming components. The TypeScript guide documents this workflow in the versioned v5 documentation: TypeScript in Astro.
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Use props and slots for different kinds of input
Props carry data; slots mark a place where the caller supplies child HTML. Making that distinction visible keeps a component’s API understandable.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →| Need | Use | What the component receives |
|---|---|---|
| Scalar value or configuration | Typed prop | A value read through Astro.props |
| Caller-controlled markup | <slot /> |
Child HTML rendered at the slot location |
| Browser event or dynamic update | Template <script> |
Client-side behavior, added only where needed |
For example, a panel can own its heading and structure while allowing each caller to choose the body markup:
---
interface Props {
heading: string;
}
const { heading } = Astro.props;
---
{heading}
A caller can then compose the panel with links, lists, or another component without forcing all content through a string prop. Use props when the component needs to interpret a value; use a slot when it should render supplied markup.
Compose small components into clear interfaces
Build larger page sections from components with one obvious responsibility: a card for presentation, a navigation item for link semantics, or a panel for layout and heading structure. Composition works best when each component documents its required props and leaves content ownership where it belongs.
- Make required information required: do not silently invent a destination, label, or identifier that callers must provide.
- Keep defaults local: a default tone or behavior belongs beside the prop declaration so consumers can understand it from the component.
- Expose semantic structure: choose elements such as
nav,section, andbuttonaccording to the component’s role rather than styling convenience. - Prefer composition to mode flags: two focused components are often clearer than one component with many mutually exclusive options.
Add browser behavior as an intentional layer
Astro does not make every component interactive. When a component needs event handling or dynamic updates, add a template <script>. Astro enhances these scripts with bundling and TypeScript support, without requiring a UI framework. The official guidance is at Scripts and event handling.
<button class="toggle" aria-expanded="false">Details</button>
<div class="details" hidden>
<slot />
</div>
<script>
const button = document.querySelector<HTMLButtonElement>(".toggle");
const details = document.querySelector<HTMLDivElement>(".details");
if (button && details) {
button.addEventListener("click", () => {
const open = button.getAttribute("aria-expanded") === "true";
button.setAttribute("aria-expanded", String(!open));
details.hidden = open;
});
}
</script>Keep the static HTML meaningful before JavaScript runs, scope selectors so multiple instances do not interfere, and make state changes accessible with attributes such as aria-expanded. If no event or live update is needed, omit the script and retain Astro’s zero-runtime default.
Best Value
Build a feedback loop that catches type errors
Editor autocomplete and diagnostics improve authoring, but they are not the same as a project check. Astro’s TypeScript guidance explicitly notes that the development server does not type-check. A page loading successfully in the dev server therefore does not prove that component props and other TypeScript code are valid.
- Use the editor’s Astro and TypeScript integration while writing components and their call sites.
- Add the version-appropriate Astro type-check command to the project’s scripts or CI workflow, following the project’s installed Astro version.
- Run that check before merging and whenever a shared
Propsinterface changes. - Treat a type failure as an API feedback signal: fix the caller, narrow the component contract, or make an option explicitly optional.
Because Astro’s configuration and TypeScript documentation is versioned, verify the exact setup and command for the version installed in your project. The configuration overview is available at Astro configuration (v5 documentation).
Quick Recap
A practical checklist for reusable components
- Is the component’s purpose clear from its name and markup?
- Are required and optional inputs declared in a
Propsinterface? - Are defaults applied while destructuring
Astro.props? - Does each prop represent data or configuration rather than opaque HTML?
- Would a slot better express caller-owned child markup?
- Does the component remain useful without browser JavaScript?
- If a script exists, is the interaction necessary, scoped, and accessible?
- Will the project’s separate type-check command run in CI, not only in an editor?
- Have version-specific instructions been checked against the Astro version actually installed?
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