Function validate

@commitlint/travis-cli/src/cli.ts:111–122

()

}

function validate() {
	if (process.env.CI !== "true" || process.env.TRAVIS !== "true") {
		throw new Error(`@commitlint/travis-cli is intended to be used on Travis CI`);
	}

	const missing = REQUIRED.filter((envVar) => !(envVar in process.env));

	if (missing.length > 0) {
		const stanza = missing.length > 1 ? "they were not" : "it was not";
		throw new Error(`Expected ${missing.join(", ")} to be defined globally, ${stanza}.`);
	}
}