Function uint8ArrayToBase64

blue_modules/uint8array-extras/index.js:154–172

(array, { urlSafe = false } = {})

const MAX_BLOCK_SIZE = 65_535;

export function uint8ArrayToBase64(array, { urlSafe = false } = {}) {
  assertUint8Array(array);

  let base64;

  if (array.length < MAX_BLOCK_SIZE) {
    // Required as `btoa` and `atob` don't properly support Unicode: https://developer.mozilla.org/en-US/docs/Glossary/Base64#the_unicode_problem
    base64 = globalThis.btoa(String.fromCodePoint.apply(this, array));
  } else {
    base64 = '';
    for (const value of array) {
      base64 += String.fromCodePoint(value);
    }

    base64 = globalThis.btoa(base64);
  }

  return urlSafe ? base64ToBase64Url(base64) : base64;
}

export function base64ToUint8Array(base64String) {
  assertString(base64String);