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