type Asana = {

  token: string;

};

/**

 * Get a custom field

 * Get the complete definition of a custom field’s metadata.

Since custom fields can be defined for one of a number of types, and

these types have different data and behaviors, there are fields that are

relevant to a particular type. For instance, as noted above, enum_options

is only relevant for the enum type and defines the set of choices that

the enum could represent. The examples below show some of these

type-specific custom field definitions.

 */

export async function main(

  auth: Asana,

  custom_field_gid: string,

  opt_pretty: string | undefined,

  opt_fields: string | undefined

) {

  const url = new URL(

    `https://app.asana.com/api/1.0/custom_fields/${custom_field_gid}`

  );

  for (const [k, v] of [

    ["opt_pretty", opt_pretty],

    ["opt_fields", opt_fields],

  ]) {

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

      url.searchParams.append(k, v);

    }

  }

  const response = await fetch(url, {

    method: "GET",

    headers: {

      Authorization: "Bearer " + auth.token,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}