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Filename :
tracker.js
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// The tracker class is intentionally as naive as possible. it is just // an ergonomic wrapper around process.emit('progress', ...) const EE = require('events') class Tracker extends EE { constructor (name, key, total) { super() if (!name) { throw new Error('proggy: Tracker needs a name') } if (typeof key === 'number' && !total) { total = key key = null } if (!total) { total = 100 } if (!key) { key = name } this.done = false this.name = name this.key = key this.value = 0 this.total = total } finish (metadata = {}) { this.update(this.total, this.total, metadata) } update (value, total, metadata) { if (!metadata) { if (total && typeof total === 'object') { metadata = total } else { metadata = {} } } if (typeof total !== 'number') { total = this.total } if (this.done) { const msg = `proggy: updating completed tracker: ${JSON.stringify(this.key)}` throw new Error(msg) } this.value = value this.total = total const done = this.value >= this.total process.emit('progress', this.key, { ...metadata, name: this.name, key: this.key, value, total, done, }) if (done) { this.done = true this.emit('done') } } } module.exports = Tracker