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1'use strict'2 3const SemVer = require('../classes/semver')4const Range = require('../classes/range')5const gt = require('../functions/gt')6 7const minVersion = (range, loose) => {8  range = new Range(range, loose)9 10  let minver = new SemVer('0.0.0')11  if (range.test(minver)) {12    return minver13  }14 15  minver = new SemVer('0.0.0-0')16  if (range.test(minver)) {17    return minver18  }19 20  minver = null21  for (let i = 0; i < range.set.length; ++i) {22    const comparators = range.set[i]23 24    let setMin = null25    comparators.forEach((comparator) => {26      // Clone to avoid manipulating the comparator's semver object.27      const compver = new SemVer(comparator.semver.version)28      switch (comparator.operator) {29        case '>':30          if (compver.prerelease.length === 0) {31            compver.patch++32          } else {33            compver.prerelease.push(0)34          }35          compver.raw = compver.format()36          /* fallthrough */37        case '':38        case '>=':39          if (!setMin || gt(compver, setMin)) {40            setMin = compver41          }42          break43        case '<':44        case '<=':45          /* Ignore maximum versions */46          break47        /* istanbul ignore next */48        default:49          throw new Error(`Unexpected operation: ${comparator.operator}`)50      }51    })52    if (setMin && (!minver || gt(minver, setMin))) {53      minver = setMin54    }55  }56 57  if (minver && range.test(minver)) {58    return minver59  }60 61  return null62}63module.exports = minVersion64