@aws-crypto/sha256-browser/src/isEmptyData.ts

SHA256 wrapper for browsers that prefers `window.crypto.subtle` but will fall back to a pure JS implementation in @aws-crypto/sha256-js to provide a consistent interface for SHA256.

import { SourceData } from "@aws-sdk/types";

export function isEmptyData(data: SourceData): boolean {
  if (typeof data === "string") {
    return data.length === 0;
  }

  return data.byteLength === 0;
}