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							- 'use strict';
 
- var hasOwn = require('hasown');
 
- function specifierIncluded(current, specifier) {
 
- 	var nodeParts = current.split('.');
 
- 	var parts = specifier.split(' ');
 
- 	var op = parts.length > 1 ? parts[0] : '=';
 
- 	var versionParts = (parts.length > 1 ? parts[1] : parts[0]).split('.');
 
- 	for (var i = 0; i < 3; ++i) {
 
- 		var cur = parseInt(nodeParts[i] || 0, 10);
 
- 		var ver = parseInt(versionParts[i] || 0, 10);
 
- 		if (cur === ver) {
 
- 			continue; // eslint-disable-line no-restricted-syntax, no-continue
 
- 		}
 
- 		if (op === '<') {
 
- 			return cur < ver;
 
- 		}
 
- 		if (op === '>=') {
 
- 			return cur >= ver;
 
- 		}
 
- 		return false;
 
- 	}
 
- 	return op === '>=';
 
- }
 
- function matchesRange(current, range) {
 
- 	var specifiers = range.split(/ ?&& ?/);
 
- 	if (specifiers.length === 0) {
 
- 		return false;
 
- 	}
 
- 	for (var i = 0; i < specifiers.length; ++i) {
 
- 		if (!specifierIncluded(current, specifiers[i])) {
 
- 			return false;
 
- 		}
 
- 	}
 
- 	return true;
 
- }
 
- function versionIncluded(nodeVersion, specifierValue) {
 
- 	if (typeof specifierValue === 'boolean') {
 
- 		return specifierValue;
 
- 	}
 
- 	var current = typeof nodeVersion === 'undefined'
 
- 		? process.versions && process.versions.node
 
- 		: nodeVersion;
 
- 	if (typeof current !== 'string') {
 
- 		throw new TypeError(typeof nodeVersion === 'undefined' ? 'Unable to determine current node version' : 'If provided, a valid node version is required');
 
- 	}
 
- 	if (specifierValue && typeof specifierValue === 'object') {
 
- 		for (var i = 0; i < specifierValue.length; ++i) {
 
- 			if (matchesRange(current, specifierValue[i])) {
 
- 				return true;
 
- 			}
 
- 		}
 
- 		return false;
 
- 	}
 
- 	return matchesRange(current, specifierValue);
 
- }
 
- var data = require('./core.json');
 
- module.exports = function isCore(x, nodeVersion) {
 
- 	return hasOwn(data, x) && versionIncluded(nodeVersion, data[x]);
 
- };
 
 
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