Function encodeIntoBase64

encoding/unstable_base64.ts:140–164

(
  input: string | Uint8Array_ | ArrayBuffer,
  output: Uint8Array_,
  options: Base64Options = {},
)

 * ```
 */
export function encodeIntoBase64(
  input: string | Uint8Array_ | ArrayBuffer,
  output: Uint8Array_,
  options: Base64Options = {},
): number {
  options.alphabet ??= "base64";
  if (typeof input === "string") {
    input = new TextEncoder().encode(input) as Uint8Array_;
  } else if (input instanceof ArrayBuffer) {
    input = new Uint8Array(input);
  }
  const min = calcSizeBase64((input as Uint8Array_).length);
  if (output.length < min) {
    throw new RangeError("Cannot encode input as base64: Output too small");
  }
  output = output.subarray(0, min);
  const i = min - (input as Uint8Array_).length;
  output.set(input as Uint8Array_, i);
  const o = encode(output, i, 0, alphabet[options.alphabet], padding);
  if (options.alphabet === "base64url") {
    const i = output.indexOf(padding, o - 2);
    if (i > 0) return i;
  }
  return o;
}

/**
 * `decodeBase64` takes an input source and decodes it into a