IAM認証有効なAPI GatewayにTypeScriptでリクエストする実装

import { fromIni } from "@aws-sdk/credential-providers";
import { SignatureV4 } from "@aws-sdk/signature-v4";
import { Sha256 } from "@aws-crypto/sha256-js";
import { HttpRequest } from "@aws-sdk/protocol-http";

const credentials = fromIni({ profile: "profile-name" });

const serviceName = "execute-api";

const options = {
  url: "https://{id}.execute-api.ap-northeast-1.amazonaws.com/",
  headers: {} as Record<string, string>,
};

const url = new URL(options.url);
const host = url.hostname;
const path = url.pathname;

const req = new HttpRequest({
  headers: {
    Host: host,
  },
  hostname: host,
  method: "GET",
  path: path,
});

const signer = new SignatureV4({
  credentials,
  region: "ap-northeast-1",
  service: serviceName,
  sha256: Sha256,
});

const signed = await signer.sign(req);

const response = await fetch(options.url, {
  headers: {
    ...signed.headers,
    Host: host,
  },
});