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#what is the type of frontmatter?
willow knotBOT
The type of frontmatter or entry.data in your code is determined by the schema you've defined for your content collection. In Astro, you can define a schema for your collection which enforces consistent frontmatter or entry data within a collection. This schema guarantees that this data exists in a predictable form when you need to reference or query it. If any file violates its collection schema, Astro will provide a helpful error to let you know.
When you define a schema for your collection, Astro will automatically generate and apply a TypeScript interface to it. The result is full TypeScript support when you query your collection, including property autocompletion and type-checking.
Here's an example of how you might define a schema for a blog collection:
// 1. Import utilities from `astro:content`
import { z, defineCollection } from 'astro:content';
// 2. Define a `type` and `schema` for each collection
const blogCollection = defineCollection({
type: 'content', // v2.5.0 and later
schema: z.object({
title: z.string(),
tags: z.array(z.string()),
image: z.string().optional(),
}),
});
// 3. Export a single `collections` object to register your collection(s)
export const collections = {
'blog': blogCollection,
};
In this example, the frontmatter or entry.data would be of type { title: string, tags: string[], image?: string }.