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/** Converts a url to base 64. Useful for example, uploading/creating server emojis. */export async function urlToBase64(url: string) {  const buffer = await fetch(url).then((res) => res.arrayBuffer());  const imageStr = encode(buffer);  const type = url.substring(url.lastIndexOf(".") + 1);  return `data:image/${type};base64,${imageStr}`;}
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.const base64abc = [  "A",  "B",  "C",  "D",  "E",  "F",  "G",  "H",  "I",  "J",  "K",  "L",  "M",  "N",  "O",  "P",  "Q",  "R",  "S",  "T",  "U",  "V",  "W",  "X",  "Y",  "Z",  "a",  "b",  "c",  "d",  "e",  "f",  "g",  "h",  "i",  "j",  "k",  "l",  "m",  "n",  "o",  "p",  "q",  "r",  "s",  "t",  "u",  "v",  "w",  "x",  "y",  "z",  "0",  "1",  "2",  "3",  "4",  "5",  "6",  "7",  "8",  "9",  "+",  "/",];
/** * CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727 * Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation * @param data */export function encode(data: ArrayBuffer | string): string {  const uint8 = typeof data === "string"    ? new TextEncoder().encode(data)    : data instanceof Uint8Array    ? data    : new Uint8Array(data);  let result = "",    i;  const l = uint8.length;  for (i = 2; i < l; i += 3) {    result += base64abc[uint8[i - 2] >> 2];    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];    result += base64abc[((uint8[i - 1] & 0x0f) << 2) | (uint8[i] >> 6)];    result += base64abc[uint8[i] & 0x3f];  }  if (i === l + 1) {    // 1 octet yet to write    result += base64abc[uint8[i - 2] >> 2];    result += base64abc[(uint8[i - 2] & 0x03) << 4];    result += "==";  }  if (i === l) {    // 2 octets yet to write    result += base64abc[uint8[i - 2] >> 2];    result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];    result += base64abc[(uint8[i - 1] & 0x0f) << 2];    result += "=";  }  return result;}