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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 diff = (version1, version2) => {
const v1 = parse(version1)
const v2 = parse(version2)
if (eq(v1, v2)) {
return null
} else {
const hasPre = v1.prerelease.length || v2.prerelease.length
const prefix = hasPre ? 'pre' : ''
const defaultResult = hasPre ? 'prerelease' : ''
if (v1.major !== v2.major) {
return prefix + 'major'
}
if (v1.minor !== v2.minor) {
return prefix + 'minor'
}
if (v1.patch !== v2.patch) {
return prefix + 'patch'
}
if (!v1.prerelease.length || !v2.prerelease.length) {
if (v1.patch) {
return 'patch'
}
if (v1.minor) {
return 'minor'
}
if (v1.major) {
return 'major'
}
}
return defaultResult // may be undefined
}
}
module.exports = diff