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Filename : index.js

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'use strict';
const fs = require('fs');

let isDocker;

function hasDockerEnv() {
	try {
		fs.statSync('/.dockerenv');
		return true;
	} catch (_) {
		return false;
	}
}

function hasDockerCGroup() {
	try {
		return fs.readFileSync('/proc/self/cgroup', 'utf8').includes('docker');
	} catch (_) {
		return false;
	}
}

module.exports = () => {
	if (isDocker === undefined) {
		isDocker = hasDockerEnv() || hasDockerCGroup();
	}

	return isDocker;
};