gnezim
29 lines
656 B
JavaScript
29 lines
656 B
JavaScript
"use strict";
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var parse = require('./parse');
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var eq = require('./eq');
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var diff = function diff(version1, version2) {
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if (eq(version1, version2)) {
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return null;
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} else {
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var v1 = parse(version1);
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var v2 = parse(version2);
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var hasPre = v1.prerelease.length || v2.prerelease.length;
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var prefix = hasPre ? 'pre' : '';
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var defaultResult = hasPre ? 'prerelease' : '';
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for (var key in v1) {
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if (key === 'major' || key === 'minor' || key === 'patch') {
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if (v1[key] !== v2[key]) {
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return prefix + key;
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}
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}
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}
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return defaultResult; // may be undefined
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}
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};
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module.exports = diff; |