[feature] Add collections filter #620
Description
Based on #566 discussion.
It would be nice to have an option to filter the collection during the build step:
const publicPosts = defineCollection({
name: "posts",
directory: "src/content/posts",
include: "**/*.md",
filter: ({level}) => level === "public"
});
const privatePosts = defineCollection({
name: "posts",
directory: "src/content/posts",
include: "**/*.md",
filter: ({level}) => level === "private"
});or
const posts = defineCollection({
name: "posts",
directory: "src/content/posts",
include: "**/*.md",
});
const publicPosts = posts.filter(({level}) => level === "public"); // here we can potentially have `.map` if derived collection has a bit different shapeI guess filter should be after transform step to be able to use complex conditions and features like other collections access.