Use an actual Map

index.js

@@ -1,22 +1,21 @@
-/* eslint-disable quote-props */
 'use strict';
 const os = require('os');
 const execa = require('execa');
 
 // Reference: https://www.gaijin.at/en/lstwinver.php
-const nameMap = {
-	'10.0': '10',
-	'6.3': '8.1',
-	'6.2': '8',
-	'6.1': '7',
-	'6.0': 'Vista',
-	'5.2': 'Server 2003',
-	'5.1': 'XP',
-	'5.0': '2000',
-	'4.9': 'ME',
-	'4.1': '98',
-	'4.0': '95'
-};
+const names = new Map([
+	['10.0', '10'],
+	['6.3', '8.1'],
+	['6.2', '8'],
+	['6.1', '7'],
+	['6.0', 'Vista'],
+	['5.2', 'Server 2003'],
+	['5.1', 'XP'],
+	['5.0', '2000'],
+	['4.9', 'ME'],
+	['4.1', '98'],
+	['4.0', '95']
+]);
 
 module.exports = release => {
 	const version = /\d+\.\d+/.exec(release || os.release());
@@ -36,5 +35,5 @@ module.exports = release => {
 		}
 	}
 
-	return nameMap[ver];
+	return names.get(ver);
 };