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name : progressEventReducer.js
 import speedometer from "./speedometer.js";
import throttle from "./throttle.js";
import utils from "../utils.js";

export const progressEventReducer = (listener, isDownloadStream, freq = 3) => {
  let bytesNotified = 0;
  const _speedometer = speedometer(50, 250);

  return throttle(e => {
    const loaded = e.loaded;
    const total = e.lengthComputable ? e.total : undefined;
    const progressBytes = loaded - bytesNotified;
    const rate = _speedometer(progressBytes);
    const inRange = loaded <= total;

    bytesNotified = loaded;

    const data = {
      loaded,
      total,
      progress: total ? (loaded / total) : undefined,
      bytes: progressBytes,
      rate: rate ? rate : undefined,
      estimated: rate && total && inRange ? (total - loaded) / rate : undefined,
      event: e,
      lengthComputable: total != null,
      [isDownloadStream ? 'download' : 'upload']: true
    };

    listener(data);
  }, freq);
}

export const progressEventDecorator = (total, throttled) => {
  const lengthComputable = total != null;

  return [(loaded) => throttled[0]({
    lengthComputable,
    total,
    loaded
  }), throttled[1]];
}

export const asyncDecorator = (fn) => (...args) => utils.asap(() => fn(...args));
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