"fetch is not defined"

[kdev]

Env

Node: v13.0.1
OS: Windows (Version 10.0.18363.778)
Package: @giphy\js-fetch-api (Version: 1.5.9)

To Reproduce

1. Have a basic node.js project set up
2. Run npm i @giphy\js-fetch-api
3. Run project

Code

const { GiphyFetch } = require("@giphy/js-fetch-api");
const giphy = new GiphyFetch("api key");
//...
const { data } = giphy.random();
console.log(data);

Error

(node:39764) UnhandledPromiseRejectionWarning: Error: fetch is not defined
    at new FetchError (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\fetch-error.js:21:28)
    at Object.<anonymous> (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:90:38)
    at step (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:33:23)
    at Object.next (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:14:53)
    at D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:8:71
    at new Promise (<anonymous>)
    at __awaiter (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:4:12)
    at makeRequest (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:52:48)
    at Object.request [as default] (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\request.js:101:27)
    at GiphyFetch.random (D:\Developement\mod-and-music\node_modules\@giphy\js-fetch-api\dist\api.js:104:33)
(node:39764) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:39764) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.  

[giannif]

@KokosnussDEV you need to add the fetch polyfill yourself, see my comment here: #58 (comment)

I will work on documenting this more clearly