var installNode = function()

in make-util.js [1054:1110]
52 lines of code
15 McCabe index (conditional complexity)

var installNode = function (nodeVersion) {
    switch (nodeVersion || '') {
        case '14':
            nodeVersion = 'v14.10.1';
            break;
        case '10':
            nodeVersion = 'v10.21.0';
            break;
        case '6':
        case '':
            nodeVersion = 'v6.10.3';
            break;
        case '5':
            nodeVersion = 'v5.10.1';
            break;
        default:
            fail(`Unexpected node version '${nodeVersion}'. Expected 5 or 6.`);
    }

    if (nodeVersion === run('node -v')) {
        console.log('skipping node install for tests since correct version is running');
        return;
    }

    // determine the platform
    var platform = os.platform();
    if (platform != 'darwin' && platform != 'linux' && platform != 'win32') {
        throw new Error('Unexpected platform: ' + platform);
    }

    var nodeUrl = 'https://nodejs.org/dist';
    switch (platform) {
        case 'darwin':
            var nodeArchivePath = downloadArchive(nodeUrl + '/' + nodeVersion + '/node-' + nodeVersion + '-darwin-x64.tar.gz');
            addPath(path.join(nodeArchivePath, 'node-' + nodeVersion + '-darwin-x64', 'bin'));
            break;
        case 'linux':
            var nodeArchivePath = downloadArchive(nodeUrl + '/' + nodeVersion + '/node-' + nodeVersion + '-linux-x64.tar.gz');
            addPath(path.join(nodeArchivePath, 'node-' + nodeVersion + '-linux-x64', 'bin'));
            break;
        case 'win32':
            var nodeDirectory = path.join(downloadPath, `node-${nodeVersion}`);
            var marker = nodeDirectory + '.completed';
            if (!test('-f', marker)) {
                var nodeExePath = downloadFile(nodeUrl + '/' + nodeVersion + '/win-x64/node.exe');
                var nodeLibPath = downloadFile(nodeUrl + '/' + nodeVersion + '/win-x64/node.lib');
                rm('-Rf', nodeDirectory);
                mkdir('-p', nodeDirectory);
                cp(nodeExePath, path.join(nodeDirectory, 'node.exe'));
                cp(nodeLibPath, path.join(nodeDirectory, 'node.lib'));
                fs.writeFileSync(marker, '');
            }

            addPath(nodeDirectory);
            break;
    }
}