Function ensureYarnInstalledAsync

setup/setup.js:66–77

* @returns {Promise<void>} result

()

 * @returns {Promise<void>} result
 */
async function ensureYarnInstalledAsync() {
	const semverPattern =
		/^(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)(?:-(?:0|[1-9]\d*|\d*[a-z-][0-9a-z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-z-][0-9a-z-]*))*)?(?:\+[0-9a-z-]+(?:\.[0-9a-z-]+)*)?$/i;
	let hasYarn = false;
	try {
		const stdout = await execGetOutput("yarn", ["-v"], "Check yarn version");
		hasYarn = semverPattern.test(stdout);
	} catch (_err) {
		hasYarn = false;
	}
	if (!hasYarn) await installYarnAsync();
}

/**
 * @returns {Promise<void>} result