lazy-js-utils/dist/chunk-Y2A7J6XS.mjs

A collection of lazy-loaded JavaScript utilities for efficient development

// src/perf/createChunk.ts
import SparkMD5 from "spark-md5";
var hashMap = /* @__PURE__ */ new Map();
function createChunk(file, index, chunkSize) {
  return new Promise((resolve) => {
    const start = index * chunkSize;
    const end = start + chunkSize;
    const spark = new SparkMD5.ArrayBuffer();
    const fileReader = new FileReader();
    fileReader.onload = (e) => {
      var _a;
      const fileBuffer = (_a = e.target) == null ? void 0 : _a.result;
      let hash;
      if (!hashMap.has(fileBuffer)) {
        spark.append(fileBuffer);
        hash = spark.end();
      } else {
        hash = hashMap.get(fileBuffer);
      }
      resolve({
        start,
        end,
        index,
        hash
      });
    };
    fileReader.readAsArrayBuffer(file.slice(start, end));
  });
}

export {
  createChunk
};