simple-email/node_modules/env-ci/services/drone.js

// https://readme.drone.io/reference/environ

module.exports = {
	detect({env}) {
		return Boolean(env.DRONE);
	},
	configuration({env}) {
		const isPr = env.DRONE_BUILD_EVENT === 'pull_request';

		return {
			name: 'Drone',
			service: 'drone',
			commit: env.DRONE_COMMIT_SHA,
			tag: env.DRONE_TAG,
			build: env.DRONE_BUILD_NUMBER,
			branch: isPr ? env.DRONE_TARGET_BRANCH : env.DRONE_BRANCH,
			job: env.DRONE_JOB_NUMBER,
			pr: env.DRONE_PULL_REQUEST,
			isPr,
			prBranch: isPr ? env.DRONE_SOURCE_BRANCH : undefined,
			slug: `${env.DRONE_REPO_OWNER}/${env.DRONE_REPO_NAME}`,
		};
	},
};