TypeError: object async_generator can't be used in 'await' expression when using -dL on Python 3.13

[INTELEON404]

Bug Report: -dL Fails with TypeError: object async_generator can't be used in 'await' expression on Python 3.13

Summary

Using the -dL option to load domains from a file causes Subdominator to crash with a TypeError on Python 3.13.

The issue appears to be caused by awaiting an async generator instead of iterating over it with async for.

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Environment

Component	Version
Subdominator	v3.0.1
Python	3.13.x
Operating System	Kali Linux
Installation Method	pipx

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Command Used

subdominator -dL wildcards.txt -o subdomain.txt

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Input File

wildcards.txt

example.com
test.com

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Expected Behavior

Subdominator should:

1. Read domains from the file specified with -dL
2. Enumerate subdomains normally
3. Save results to the output file

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Actual Behavior

The application terminates immediately with the following exception:

TypeError: object async_generator can't be used in 'await' expression

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Full Stack Trace

[INFO]: Loading provider configuration from /home/inteleon404/.config/Subdominator/provider-config.yaml

Traceback (most recent call last):
  File "/home/inteleon404/.local/bin/subdominator", line 6, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/inteleon404/.local/share/pipx/venvs/subdominator/lib/python3.13/site-packages/subdominator/cli/app.py", line 375, in main
    exit_code = loop.run_until_complete(run(cancel_event=cancel_event))
  File "/usr/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/home/inteleon404/.local/share/pipx/venvs/subdominator/lib/python3.13/site-packages/subdominator/cli/app.py", line 262, in run
    domains = await _load_domains(args)
              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/inteleon404/.local/share/pipx/venvs/subdominator/lib/python3.13/site-packages/subdominator/cli/app.py", line 111, in _load_domains
    return [line.strip() for line in await FileUtils.stream(args.domain_list) if line.strip()]
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: object async_generator can't be used in 'await' expression

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Suspected Root Cause

The following code appears to await an async generator:

return [line.strip() for line in await FileUtils.stream(args.domain_list) if line.strip()]

If FileUtils.stream() returns an async generator, it should not be awaited directly.

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Suggested Fix

Consume the async generator using async for:

domains = []

async for line in FileUtils.stream(args.domain_list):
    if line.strip():
        domains.append(line.strip())

return domains

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Reproducibility

• Reproducible every run
• Reproducible with multiple input files
• Reproducible on Python 3.13
• Tested on Python 3.12
• Tested on Python 3.11

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Additional Notes

The issue only occurs when using the -dL option.

Further testing may be needed to determine whether this is:

• A Python 3.13 compatibility issue
• An implementation bug in the domain list loader
• A regression introduced in v3.0.1

Thanks for maintaining the project.