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progress-emitter.js
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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;