claude-code - 💡(How to fix) Fix `Unhandled node type: pipeline` when piping a heredoc into a command [1 comments, 2 participants]

(cmd < file) passes without error.

TL;DR

The issue can be worked around by writing the heredoc to a file first and then redirecting it to the command, instead of piping it directly.

Guidance

• The error Unhandled node type: pipeline suggests that the parser is failing to handle the pipeline node in the heredoc-pipe pattern.
• The fact that the redirect form (cmd < file) works without error implies that the issue is specific to the pipeline node.
• To verify the workaround, try writing the heredoc to a file and then redirecting it to the command, as shown in the reproduction steps.
• The related issue #47701 may provide additional context, but it appears to be a distinct case.

Example

printf 'hello world\n' > /tmp/repro_input.txt
cat < /tmp/repro_input.txt

Notes

The root cause of the issue is unclear, but it appears to be related to the parser's handling of pipeline nodes. The workaround provided in the reproduction steps should mitigate the issue, but a more permanent fix may require changes to the parser.

Recommendation

Apply workaround: writing the heredoc to a file first and then redirecting it to the command, as this has been shown to work in the reproduction steps.