| 1 | var assert = require('assert')
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| 2 |
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| 3 | var hasPerf = typeof window !== 'undefined' &&
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| 4 | window.performance && window.performance.mark
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| 5 |
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| 6 | module.exports = nanotiming
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| 7 |
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| 8 | function nanotiming (name) {
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| 9 | assert.equal(typeof name, 'string', 'nanotiming: name should be type string')
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| 10 |
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| 11 | if (!hasPerf) return noop
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| 12 |
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| 13 | var uuid = (window.performance.now() * 100).toFixed()
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| 14 | var startName = name + '-start-' + uuid
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| 15 | window.performance.mark(startName)
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| 16 |
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| 17 | return function () {
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| 18 | var endName = name + '-end-' + uuid
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| 19 | window.performance.mark(endName)
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| 20 |
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| 21 | ric(function () {
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| 22 | var measureName = name + ' [' + uuid + ']'
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| 23 | window.performance.measure(measureName, startName, endName)
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| 24 | window.performance.clearMarks(startName)
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| 25 | window.performance.clearMarks(endName)
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| 26 | })
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| 27 | }
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| 28 | }
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| 29 |
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| 30 | function ric (cb) {
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| 31 | if (this.hasIdleCallback) window.requestIdleCallback(cb)
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| 32 | else setTimeout(cb, 0)
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| 33 | }
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| 34 |
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| 35 | function noop () {}
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