Update merge request

//native

/**

 * Update merge request

 * Change a merge request's title, description, target branch, labels, assignees or reviewers, or close or reopen it. Empty fields are left unchanged; labels replaces all labels, add_labels and remove_labels change some, clear_assignees and clear_reviewers remove everyone.

 */

export async function main(

  auth: RT.Gitlab,

  project: string,

  merge_request_iid: number,

  title: string | undefined,

  description: string | undefined,

  target_branch: string | undefined,

  labels: string[] | undefined,

  add_labels: string[] | undefined,

  remove_labels: string[] | undefined,

  assignee_ids: number[] | undefined,

  reviewer_ids: number[] | undefined,

  state_event: "keep" | "close" | "reopen" | undefined,

  clear_assignees: boolean = false,

  clear_reviewers: boolean = false

) {

  const list = (v: string[] | undefined) =>

    v?.length ? v.join(",") : undefined

  const url = `${(auth.baseUrl || "https://gitlab.com").replace(/\/+$/, "")}/api/v4/projects/${encodeURIComponent(project)}/merge_requests/${merge_request_iid}`

  const response = await fetch(url, {

    method: "PUT",

    headers: {

      Authorization: `Bearer ${auth.token}`,

      "Content-Type": "application/json",

      Accept: "application/json",

    },

    body: JSON.stringify({

      title: title || undefined,

      description: description || undefined,

      target_branch: target_branch || undefined,

      labels: list(labels),

      add_labels: list(add_labels),

      remove_labels: list(remove_labels),

      // An empty list leaves them as they are; clear_* removes everyone.

      assignee_ids: clear_assignees

        ? []

        : assignee_ids?.length

          ? assignee_ids

          : undefined,

      reviewer_ids: clear_reviewers

        ? []

        : reviewer_ids?.length

          ? reviewer_ids

          : undefined,

      state_event:

        state_event && state_event !== "keep" ? state_event : undefined,

    }),

  })

  if (!response.ok) {

    throw new Error(`${response.status} ${await response.text()}`)

  }

  return await response.json()

}