requested changes

.changeset/lovely-pianos-breathe.md

@@ -2,4 +2,39 @@
 'astro': minor
 ---
 
-feat: custom file formats in astro/loader/file.ts
+Adds support for custom parsers to file loader
+
+For example, with a toml file of this format:
+```toml
+[[dogs]]
+id = "..."
+age = "..."
+
+[[dogs]]
+id = "..."
+age = "..."
+```
+a content collection using this file could look like this
+```typescript
+import { defineCollection } from "astro:content"
+import { file } from "astro/loaders"
+import { parse as parseToml } from "toml"
+const dogs = defineCollection({
+  loader: file("src/data/dogs.toml", { parser: (text) => parseToml(text).dogs }),
+  schema: /* ... */
+})
+```
+
+This also adds support for nested json documents. For example:
+```json
+{"dogs": [{}], "cats": [{}]}
+```
+can be consumed using
+```typescript
+const dogs = defineCollection({
+  loader: file("src/data/pets.json", { parser: (text) => JSON.parse(text).dogs })
+})
+const cats = defineCollection({
+  loader: file("src/data/pets.json", { parser: (text) => JSON.parse(text).cats })
+})
+```

packages/astro/src/content/loaders/file.ts

@@ -9,7 +9,9 @@ export interface FileOptions {
 	 * the parsing function to use for this data
 	 * @default JSON.parse or yaml.load, depending on the extension of the file
 	 * */
-	parser?: (text: string) => any;
+	parser?: (
+		text: string,
+	) => Record<string, unknown> | Array<{ id: string } & Record<string, unknown>>;
 }
 
 /**