const { ProgressSmoother } = require("progress-smoother")

const progress = ProgressSmoother({
  // Required.
  maxValue: 12345,                  // Maximum value of your progress bar.
  valueIncreaseRatePerSecond: 5000, // Estimated minimum throughput for '.setValue()' calls.
  valueIncreaseDelta: 500,          // Estimated minimum delta between '.setValue()' calls.
  averageTimeBetweenValues: 5000,   // Estimated mean time between '.setValue()' calls in milliseconds.
  minDelayUntilFirstValue: 6000,    // Estimated minimum delay until the first '.setValue()' call is made.

  // Optional.
  teardownTime: 2000                // Latency your app introduces after 100% progress (the function incorporates it).
});

// Report progress events:
progress.setValue(1025);
progress.setValue(3201);
...
progress.setValue(12345);

// Get smoothed progress any time (e.g. on a fixed interval):
progress.smoothedFactor(); // Returns 0..1