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diff.js
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diff.js
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const parse = require('./parse')
const eq = require('./eq')
const gt = require('./gt')
const diff = (version1, version2) => {
const v1 = parse(version1)
const v2 = parse(version2)
if (eq(v1, v2)) {
return null
}
const v1Higher = gt(v1, v2)
const highVersion = v1Higher ? v1 : v2
const lowVersion = v1Higher ? v2 : v1
const highHasPre = !!highVersion.prerelease.length
const lowHasPre = !!lowVersion.prerelease.length
const prefix = highHasPre && !lowHasPre ? 'pre' : ''
if (v1.major !== v2.major) {
return prefix + 'major'
}
if (v1.minor !== v2.minor) {
return prefix + 'minor'
}
if (v1.patch !== v2.patch) {
return prefix + 'patch'
}
// at this point we know stable versions match but overall versions are not equal,
// so either they are both prereleases, or the lower version is a prerelease
if (highHasPre) {
// high and low are preleases
return 'prerelease'
}
if (lowVersion.patch) {
// anything higher than a patch bump would result in the wrong version
return 'patch'
}
if (lowVersion.minor) {
// anything higher than a minor bump would result in the wrong version
return 'minor'
}
// bumping major/minor/patch all have same result
return 'major'
}
module.exports = diff