index.js

const Path = require('path');
const importFrom = require('import-from');
const resolvePkg = require('resolve-pkg');
const semver = require('semver');

module.exports = {
	utils: {getPackages},
	rules: {
		'scope-enum': ctx =>
			getPackages(ctx).then(packages => [2, 'always', packages])
	}
};

function getPackages(context) {
	return Promise.resolve()
		.then(() => {
			const ctx = context || {};
			const cwd = ctx.cwd || process.cwd();
			const lernaVersion = getLernaVersion(cwd);

			if (semver.lt(lernaVersion, '3.0.0')) {
				const Repository = importFrom(cwd, 'lerna/lib/Repository');
				const PackageUtilities = importFrom(cwd, 'lerna/lib/PackageUtilities');

				const repository = new Repository(cwd);
				return PackageUtilities.getPackages({
					packageConfigs: repository.packageConfigs,
					rootPath: cwd
				});
			}

			const Project = importFrom(cwd, '@lerna/project');
			const project = new Project(cwd);
			return project.getPackages();
		})
		.then(packages => {
			return packages
				.map(pkg => pkg.name)
				.map(name => (name.charAt(0) === '@' ? name.split('/')[1] : name));
		});
}

function getLernaVersion(cwd) {
	return require(Path.join(resolvePkg('lerna', {cwd}), 'package.json')).version;
}