relion/src/lib/latest-semver-tag.js

Release workflow helper for Node.js projects.

import * as gitSemverTags from 'git-semver-tags';
import semver from 'semver';

export default function ({ tagPrefix, prerelease }) {
	return new Promise((resolve, reject) => {
		gitSemverTags({ tagPrefix }, function (err, tags) {
			if (err) return reject(err);
			else if (!tags.length) return resolve('1.0.0');
			// Respect tagPrefix
			tags = tags.map((tag) => tag.replace(new RegExp('^' + tagPrefix), ''));
			if (prerelease) {
				// ignore any other prelease tags
				tags = tags.filter((tag) => {
					if (!semver.valid(tag)) return false;
					if (!semver.prerelease(tag)) {
						// include all non-prerelease versions
						return true;
					}
					// check if the name of the prerelease matches the one we are looking for
					if (semver.prerelease(tag)[0] === prerelease) {
						return true;
					}
					return false;
				});
			}
			// ensure that the largest semver tag is at the head.
			tags = tags.map((tag) => {
				return semver.clean(tag);
			});
			tags.sort(semver.rcompare);
			return resolve(tags[0]);
		});
	});
}