Convert a few more build scripts to TypeScript

For #277526

build/lib/node.ts

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import path from 'path';
+import fs from 'fs';
+
+const root = path.dirname(path.dirname(import.meta.dirname));
+const npmrcPath = path.join(root, 'remote', '.npmrc');
+const npmrc = fs.readFileSync(npmrcPath, 'utf8');
+const version = /^target="(.*)"$/m.exec(npmrc)?.[1];
+
+if (!version) {
+	throw new Error('Failed to extract Node version from .npmrc');
+}
+
+const platform = process.platform;
+const arch = process.arch;
+
+const node = platform === 'win32' ? 'node.exe' : 'node';
+const nodePath = path.join(root, '.build', 'node', `v${version}`, `${platform}-${arch}`, node);
+
+console.log(nodePath);