Allow non-TTY stdin watch mode #448
Merged
+12
−1
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The presence of stdin doesn't necessarily mean there's an allocated tty. This breaks watch mode in non-TTY stdin contexts (e.g. docker, foreman, etc). A simple process.stdin.isTTY check would theoretically be enough but unfortunately, subprocesses don't have the same API, and they are used extensively for testing via calls to the function
spawn
.A simple solution is to inject an env var dependency where we tell the process that it's indeed a TTY-allocated process and so, watch mode with exit handling is good to go.
A more robust but also annoying solution would involve using an actual terminal emulator (like Microsoft's node-pty). Though the environment gets exponentially more difficult to setup since it
involves compiling bindings, which require different requirements per OS.
Closes #424