How can i get post by tag use for Content API Client Library

Developer help
1

i want to get post by tag use for Content API Client Library

const res = await $ghost.posts.browse({
  slug: params.slug,
  limit: 12,
  include: 'tags,authors'
})

I try many params but get all post not by tag

2

i reslove
const res = await $ghost.posts.browse({
filter: tag:${params.slug},
page: 1,
limit: 12
})