const parse = require('./parse.js')
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const diff = (version1, version2) => {
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const v1 = parse(version1, null, true)
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const v2 = parse(version2, null, true)
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const comparison = v1.compare(v2)
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if (comparison === 0) {
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return null
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}
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const v1Higher = comparison > 0
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const highVersion = v1Higher ? v1 : v2
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const lowVersion = v1Higher ? v2 : v1
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const highHasPre = !!highVersion.prerelease.length
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const lowHasPre = !!lowVersion.prerelease.length
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if (lowHasPre && !highHasPre) {
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// Going from prerelease -> no prerelease requires some special casing
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// If the low version has only a major, then it will always be a major
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// Some examples:
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// 1.0.0-1 -> 1.0.0
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// 1.0.0-1 -> 1.1.1
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// 1.0.0-1 -> 2.0.0
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if (!lowVersion.patch && !lowVersion.minor) {
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return 'major'
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}
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// Otherwise it can be determined by checking the high version
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if (highVersion.patch) {
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// anything higher than a patch bump would result in the wrong version
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return 'patch'
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}
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if (highVersion.minor) {
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// anything higher than a minor bump would result in the wrong version
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return 'minor'
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}
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// bumping major/minor/patch all have same result
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return 'major'
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}
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// add the `pre` prefix if we are going to a prerelease version
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const prefix = highHasPre ? 'pre' : ''
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if (v1.major !== v2.major) {
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return prefix + 'major'
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}
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if (v1.minor !== v2.minor) {
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return prefix + 'minor'
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}
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if (v1.patch !== v2.patch) {
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return prefix + 'patch'
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}
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// high and low are preleases
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return 'prerelease'
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}
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module.exports = diff
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