# Fix TypeError in process.chdir() call

[piperTang]

Fix TypeError in process.chdir() call

Description of the bug

When running the Messari Subgraph CLI, users may encounter the following error:

TypeError: The "directory" argument must be of type string. Received undefined
    at wrappedChdir (node:internal/bootstrap/switches/does_own_process_state:129:3)
    at process.chdir (node:internal/worker:110:5)
    at Object.<anonymous> (C:\Users\Administrator\AppData\Roaming\fnm\node-versions\v20.16.0\installation\node_modules\messari-subgraph-cli\bin\env.ts:4:9)
    ...

This error occurs because process.chdir() is being called with an undefined argument, likely due to process.cwd() returning undefined in certain environments or scenarios.

Proposed fix

Add a check before calling process.chdir() to ensure we have a valid directory string:

if (process.cwd()) {
  process.chdir(process.cwd());
} else {
  console.error('Current working directory is undefined');
  process.exit(1);
}

Impact

This fix prevents the CLI from crashing due to an invalid argument type and provides a more informative error message if the current working directory cannot be determined.

Testing

• Tested the fix in environments where the error was previously occurring
• Verified that the CLI functions correctly in normal scenarios
• Simulated scenarios where process.cwd() might return undefined to ensure proper error handling

Additional notes

• This issue may be more prevalent in certain environments or file system configurations
• Consider adding more robust directory handling throughout the CLI to prevent similar issues in the future

Closes #[Issue Number] (if applicable)