jsbeautifier

Ensure `jsbeautifier` is properly installed and up-to-date by running `pip install --upgrade jsbeautifier`. If the error persists, especially when installing other packages like `cssbeautifier`, try installing `jsbeautifier` first before the dependent package.

Explicitly specify the correct encoding, usually 'utf-8', when reading the input content or opening files.
```python
import jsbeautifier

# When reading from a file
with open('input.js', 'r', encoding='utf-8') as f:
    input_code = f.read()
beautified_code = jsbeautifier.beautify(input_code)

# When writing to a file, also specify encoding
with open('output.js', 'w', encoding='utf-8') as f:
    f.write(beautified_code)
```

Instead of relying on command-line flags, use the programmatic interface of `jsbeautifier` in Python to pass options. You can load configuration from a file manually and then apply it.
```python
import jsbeautifier
import json

# Define options programmatically or load from a file
opts = jsbeautifier.default_options()
opts.indent_size = 2
opts.space_in_empty_paren = True

# Example: If you had a .jsbeautifyrc file
# with open('.jsbeautifyrc', 'r') as f:
#     config_from_file = json.load(f)
# for key, value in config_from_file.items():
#     setattr(opts, key, value)

code = "function test(){var x=1;}"
beautified_code = jsbeautifier.beautify(code, opts)
print(beautified_code)
```