import * as fs from 'node:fs';
import * as path from 'node:path';
/**
* Find the nearest tsconfig.json starting from a directory and walking up.
* Returns null if no tsconfig.json is found before reaching the filesystem root.
*/
export function findTsConfig(startDir: string): string | null {
let currentDir = path.resolve(startDir);
const root = path.parse(currentDir).root;
while (currentDir !== root) {
const tsconfigPath = path.join(currentDir, 'tsconfig.json');
if (fs.existsSync(tsconfigPath)) {
return tsconfigPath;
}
currentDir = path.dirname(currentDir);
}
// Check root directory as well
const rootTsconfig = path.join(root, 'tsconfig.json');
if (fs.existsSync(rootTsconfig)) {
return rootTsconfig;
}
return null;
}
/**
* Find all tsconfig.json files in a directory tree (useful for monorepos).
* Excludes node_modules by default.
*/
export function findAllTsConfigs(
rootDir: string,
options: { excludeNodeModules?: boolean } = {}
): string[] {
const { excludeNodeModules = true } = options;
const results: string[] = [];
function walk(dir: string): void {
let entries: fs.Dirent[];
try {
entries = fs.readdirSync(dir, { withFileTypes: true });
} catch {
return; // Skip directories we can't read
}
for (const entry of entries) {
const fullPath = path.join(dir, entry.name);
if (entry.isDirectory()) {
if (excludeNodeModules && entry.name === 'node_modules') {
continue;
}
walk(fullPath);
} else if (entry.isFile() && entry.name === 'tsconfig.json') {
results.push(fullPath);
}
}
}
walk(path.resolve(rootDir));
return results;
}
/**
* Get the project root directory from a tsconfig path.
*/
export function getProjectRoot(tsconfigPath: string): string {
return path.dirname(path.resolve(tsconfigPath));
}
