# All files / src/config cwrc.ts

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    8x

     /**
     * .cwrc File Operations
     *
     * Find, read, and write the .cwrc configuration file.
     * The file's presence marks the workspace root directory.
     */

    import { readFileSync, writeFileSync, existsSync } from 'node:fs';
    import { join, dirname, parse } from 'node:path';
    import type { CwConfig } from './types.js';

    /** Default filename */
    const CWRC_FILENAME = '.cwrc';

    /**
     * Walk up from `startDir` looking for a .cwrc file.
     * Returns the absolute path to the directory containing it,
     * or null if the filesystem root is reached.
     */
    export function findWorkspaceRoot(startDir: string = process.cwd()): string | null {
      let dir = startDir;

      while (true) {
        const candidate = join(dir, CWRC_FILENAME);
        if (existsSync(candidate)) {
          return dir;
        }

        const parent = dirname(dir);
        if (parent === dir) {
          // Reached filesystem root
          return null;
        }
        dir = parent;
      }
    }

    /**
     * Read and parse the .cwrc file in the given directory.
     * Returns null if the file doesn't exist.
     * Throws on malformed JSON.
     */
    export function readCwrc(dir: string): CwConfig | null {
      const filePath = join(dir, CWRC_FILENAME);
      if (!existsSync(filePath)) {
        return null;
      }

      const raw = readFileSync(filePath, 'utf-8');
      return JSON.parse(raw) as CwConfig;
    }

    /**
     * Write a .cwrc file to the given directory.
     */
    export function writeCwrc(dir: string, config: CwConfig): void {
      const filePath = join(dir, CWRC_FILENAME);
      writeFileSync(filePath, JSON.stringify(config, null, 2) + '\n', 'utf-8');
    }

    /**
     * Create a default .cwrc config.
     */
    export function defaultCwConfig(): CwConfig {
      return { version: 1 };
    }