Http Client to fetch urls

httpClient.ts

type THttpMethod = "GET" | "POST" | "PUT" | "DELETE";

export const httpClient = (
  url: string,
  method: THttpMethod = "GET",
  data: any = {}
) => {
  const params: { [i: string]: any } = {
    method,
    headers: {
      "Content-Type": "application/json",
      Accept: "application/json"
    }
  };

  if (method !== "GET") {
    params.body = JSON.stringify(data);
  } else {
    url = `${url}?${Object.keys(data)
      .map(key => `${key}=${data[key]}`)
      .join("&")}`;
  }

  return new Promise<any>((resolve, reject) => {
    fetch(url, params).then(res => {
      if (res.ok) {
        res.json().then(resolve);
      } else {
        res.json().then(reject);
      }
    });
  });
};