Function toBase64

packages/common/http/src/transfer_cache.ts:404–418

(buffer: unknown)

}

function toBase64(buffer: unknown): string {
  //TODO: replace with when is Baseline widely available
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array/toBase64
  const bytes = new Uint8Array(buffer as ArrayBufferLike);

  const CHUNK_SIZE = 0x8000; // 32,768 bytes (~32 KB) per chunk, to avoid stack overflow

  let binaryString = '';

  for (let i = 0; i < bytes.length; i += CHUNK_SIZE) {
    const chunk = bytes.subarray(i, i + CHUNK_SIZE);
    binaryString += String.fromCharCode.apply(null, chunk as unknown as number[]);
  }
  return btoa(binaryString);
}

function fromBase64(base64: string): ArrayBuffer {
  const binary = atob(base64);