Retrieve a visitor with User ID

//native

type Intercom = {

	apiVersion: string

	token: string

}

/**

 * Retrieve a visitor with User ID

 * You can fetch the details of a single visitor.

 */

export async function main(auth: Intercom, user_id: string | undefined) {

	const url = new URL(`https://api.intercom.io/visitors`)

	for (const [k, v] of [['user_id', user_id]]) {

		if (v !== undefined && v !== '' && k !== undefined) {

			url.searchParams.append(k, v)

		}

	}

	const response = await fetch(url, {

		method: 'GET',

		headers: {

			'Intercom-Version': auth.apiVersion,

			Authorization: 'Bearer ' + auth.token

		},

		body: undefined

	})

	if (!response.ok) {

		const text = await response.text()

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

	}

	return await response.json()

}