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onProgress

Long-running commands can accept an onProgress callback that is called with GitProgressEvents.

/**
 * @typedef {Object} GitProgressEvent
 * @property {string} phase
 * @property {number} loaded
 * @property {number} total
 */

Progress events are not guaranteed to be in order or always incrementing. Many git commands (like clone) actually consist of multiple sub-commands (fetch + indexPack + checkout) which makes computing a single progress percentage tricky. Instead, progress events are marked with a phase that provides a description of what step of the process it is in. You could choose to show the phase as a label next to the progress bar, or show one progress bar per phase.

Usage Example:

You are writing a browser application, and want to display progress in your UI somehow.

import { clone } from 'isomorphic-git'
clone({
  ...,
  onProgress: event => {
    updateLabel(event.phase)
    if (event.total) {
      updateProgressBar(event.loaded / event.total)
    } else {
      updateIndeterminateProgressBar(event.loaded)
    }
  }
})