The execSync call should include the shell: false option for security. While the command is hardcoded (not using user input), explicitly disabling shell interpretation is a security best practice to prevent command injection vulnerabilities.

Suggested fix:

execSync('watchman version', { stdio: 'ignore', timeout: 5000, shell: false });

The comment states "Check if Watchman is installed and running" but the implementation only checks if the watchman version command executes successfully. This doesn't verify that the Watchman daemon is actually running and ready to watch files.

Consider either:

1. Updating the comment to accurately reflect what's being checked: "Check if Watchman is installed"
2. Or enhancing the check to verify the daemon is running (e.g., using watchman get-sockname which requires the daemon to be active)

The spawnSync call should include error handling for robustness. While the current logic correctly falls back to false when status !== 0, spawnSync can:

1. Throw exceptions in rare cases (e.g., invalid options or system resource issues)
2. Return status: null when the process times out or is terminated by a signal
3. Set result.error when the command fails to spawn

Without error handling, an exception would leave watchmanAvailable as null, causing repeated execution attempts. Consider wrapping the check in a try-catch and checking for result.error:

private isWatchmanAvailable(): boolean {
  if (this.watchmanAvailable !== null) {
    return this.watchmanAvailable;
  }
  try {
    const result = spawnSync('watchman', ['version'], { stdio: 'ignore', timeout: 5000 });
    if (result.error) {
      this.logger.debug(`Watchman check failed: ${result.error.message}`);
      this.watchmanAvailable = false;
    } else {
      this.watchmanAvailable = result.status === 0;
    }
  } catch (err) {
    this.logger.debug(`Error checking Watchman availability: ${err}`);
    this.watchmanAvailable = false;
  }
  return this.watchmanAvailable;
}

remove only @davidfirst

[nitpick] Consider logging when Watchman detection fails or times out to help users debug watcher configuration issues. This would make it easier to diagnose problems like Watchman being installed but not responding properly.

try {
  const result = spawnSync('watchman', ['version'], { stdio: 'ignore', timeout: 5000 });
  this.watchmanAvailable = !result.error && result.status === 0;
  if (!this.watchmanAvailable && result.error) {
    this.logger.debug(`Watchman check failed: ${result.error.message}`);
  }
} catch (err: any) {
  this.logger.debug(`Watchman check threw exception: ${err.message}`);
  this.watchmanAvailable = false;
}

The spawnSync import should be combined with the existing ChildProcess import from child_process at line 13 to maintain consistent import organization.

Consider changing line 13 to:

import type { ChildProcess } from 'child_process';
import { spawnSync } from 'child_process';

or

import { spawnSync, type ChildProcess } from 'child_process';