'use strict';
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var NS_PER_SEC = 1e9;
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var MS_PER_NS = 1e6;
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/**
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* Get duration in milliseconds from two process.hrtime()
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* @function hrTimeDurationInMs
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* @param {Array} startTime - [seconds, nanoseconds]
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* @param {Array} endTime - [seconds, nanoseconds]
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* @returns {Number|null} durationInMs
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*/
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function hrTimeDurationInMs(startTime, endTime) {
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if (!Array.isArray(startTime) || !Array.isArray(endTime)) {
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return null;
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}
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var secondDiff = endTime[0] - startTime[0];
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var nanoSecondDiff = endTime[1] - startTime[1];
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var diffInNanoSecond = secondDiff * NS_PER_SEC + nanoSecondDiff;
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return Math.round(diffInNanoSecond / MS_PER_NS);
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}
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module.exports = hrTimeDurationInMs;
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