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28 lines
464 B
JavaScript
28 lines
464 B
JavaScript
6 years ago
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'use strict';
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var semver = require('semver');
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module.exports = function (a, b) {
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if (semver.gt(a, b)) {
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return null;
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}
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a = semver.parse(a);
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b = semver.parse(b);
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for (var key in a) {
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if (key === 'major' || key === 'minor' || key === 'patch') {
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if (a[key] !== b[key]) {
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return key;
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}
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}
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if (key === 'prerelease' || key === 'build') {
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if (JSON.stringify(a[key]) !== JSON.stringify(b[key])) {
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return key;
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}
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}
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}
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return null;
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};
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