ghost/core/server/lib/ghost-version.js

const path = require('path');
const semver = require('semver');
const rootUtils = require('@tryghost/root-utils');
const packageInfo = require(path.join(rootUtils.getProcessRoot(), 'package.json'));
const version = packageInfo.version;
const plainVersion = version.match(/^(\d+\.)?(\d+\.)?(\d+)/)[0];

let _private = {};

_private.compose = function compose(type) {
    switch (type) {
    case 'pre':
        return plainVersion + '-' + semver.prerelease(version).join('.');
    default:
        return version;
    }
};

// major.minor
module.exports.safe = version.match(/^(\d+\.)?(\d+)/)[0];

// major.minor.patch-{prerelease}
module.exports.full = semver.prerelease(version) ? _private.compose('pre') : plainVersion;

// original string in package.json (can contain pre-release and build suffix)
module.exports.original = version;