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20 lines
414 B
20 lines
414 B
var util = require('util')
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var Transform = require('stream').Transform
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util.inherits(Counter, Transform)
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module.exports = Counter
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function Counter(options) {
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if (!(this instanceof Counter))
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return new Counter(options)
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Transform.call(this, options)
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this.length = 0
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}
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Counter.prototype._transform = function (chunk, encoding, callback) {
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this.length += chunk.length
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this.push(chunk)
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callback()
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}
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