List core web vital metrics trend

type Cloudflare = {

  token: string;

  email: string;

  key: string;

};

/**

 * List core web vital metrics trend

 * Lists the core web vital metrics trend over time for a specific page.

 */

export async function main(

  auth: Cloudflare,

  zone_identifier: string,

  url: string,

  region:

    | "asia-east1"

    | "asia-northeast1"

    | "asia-northeast2"

    | "asia-south1"

    | "asia-southeast1"

    | "australia-southeast1"

    | "europe-north1"

    | "europe-southwest1"

    | "europe-west1"

    | "europe-west2"

    | "europe-west3"

    | "europe-west4"

    | "europe-west8"

    | "europe-west9"

    | "me-west1"

    | "southamerica-east1"

    | "us-central1"

    | "us-east1"

    | "us-east4"

    | "us-south1"

    | "us-west1"

    | undefined,

  deviceType: "DESKTOP" | "MOBILE" | undefined,

  start: string | undefined,

  end: string | undefined,

  tz: string | undefined,

  metrics: string | undefined

) {

  const url_ = new URL(

    `https://api.cloudflare.com/client/v4/zones/${zone_identifier}/speed_api/pages/${url}/trend`

  );

  for (const [k, v] of [

    ["region", region],

    ["deviceType", deviceType],

    ["start", start],

    ["end", end],

    ["tz", tz],

    ["metrics", metrics],

  ]) {

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

      url_.searchParams.append(k, v);

    }

  }

  const response = await fetch(url_, {

    method: "GET",

    headers: {

      "X-AUTH-EMAIL": auth.email,

      "X-AUTH-KEY": auth.key,

      Authorization: "Bearer " + auth.token,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}