cross-ci/lib/var/PROJECT_OWNER.js

`cross-ci` standardizes environment variables for CI. For example, your can simply use `BUILD_BRANCH` variable in all CI runners instead of `CIRCLE_BRANCH` in CircleCI or `TRAVIS_PULL_REQUEST_BRANCH` in Travis.

const pkg = require('../pkg');

const extractFromPackageJson = () => {
    try {
        const {url} = pkg.repository;

        if (typeof url === 'string') {
            const matches = url.match(/github.com\/([^/]+)/i);

            return matches && matches[1]
                ? matches[1]
                : '';
        }
    // eslint-disable-next-line no-empty
    } catch (error) {}

    return '';
};

/// User name or organization name that owns the repository.
const PROJECT_OWNER = () =>
    process.env.CIRCLE_PROJECT_USERNAME
    || (process.env.TRAVIS_REPO_SLUG ? process.env.TRAVIS_REPO_SLUG.split('/')[0] : '')
    || process.env.CI_PROJECT_NAMESPACE // Gitlab
    || extractFromPackageJson()
    || '___UNKNOWN_PROJECT_OWNER___';

module.exports = PROJECT_OWNER;