Calculate checksums for files in local directory in JS

checksums.js

// Remember there are file size limits in V8
for (const file of files) {
    reader = new FileReader();
    totalBytes += file.size;
    totalFiles++;

    reader.onload = event => {
      filesRead++;
      const binary = event.target.result;
      try {
        file.md5 = CryptoJS.MD5(binary).toString();
      } catch (error) {
        console.log(error)
      }
      console.log(file)
      fileList.push(file)
      this.setState(
        {
          totalFiles: totalFiles,
          totalBytes: totalBytes,
          files: fileList
        },
        () => {
          if (
            this.state.files.length &&
            this.state.csvData.length &&
            filesRead == files.length
          ) {
            this.generateReports();
          }
        }
      );
      delete reader.result;
    };
    reader.readAsBinaryString(file);

  }