Get issue types for custom field context

type Jira = {

  username: string;

  password: string;

  domain: string;

};

/**

 * Get issue types for custom field context

 * Returns a [paginated](#pagination) list of context to issue type mappings for a custom field. Mappings are returned for all contexts or a list of contexts. Mappings are ordered first by context ID and then by issue type ID.

**[Permissions](#permissions) required:** *Administer Jira* [global permission](https://confluence.atlassian.com/x/x4dKLg).

 */

export async function main(

  auth: Jira,

  fieldId: string,

  contextId: string | undefined,

  startAt: string | undefined,

  maxResults: string | undefined

) {

  const url = new URL(

    `https://${auth.domain}.atlassian.net/rest/api/2/field/${fieldId}/context/issuetypemapping`

  );

  for (const [k, v] of [

    ["contextId", contextId],

    ["startAt", startAt],

    ["maxResults", maxResults],

  ]) {

    if (v !== undefined && v !== "") {

      url.searchParams.append(k, v);

    }

  }

  const response = await fetch(url, {

    method: "GET",

    headers: {

      Authorization: "Basic " + btoa(`${auth.username}:${auth.password}`),

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}