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| 'use strict';
| const EventEmitter = require('events');
|
| const written = new WeakMap();
|
| class ProgressEmitter extends EventEmitter {
| constructor(source, destination) {
| super();
| this._source = source;
| this._destination = destination;
| }
|
| set written(value) {
| written.set(this, value);
| this.emitProgress();
| }
|
| get written() {
| return written.get(this);
| }
|
| emitProgress() {
| const {size, written} = this;
| this.emit('progress', {
| src: this._source,
| dest: this._destination,
| size,
| written,
| percent: written === size ? 1 : written / size
| });
| }
| }
|
| module.exports = ProgressEmitter;
|
|
