postcss-cli 9.1.0 watch cannot be run without tty

[ToppleTheNun]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch postcss-cli@9.1.0 for the project I'm working on.

found from running postcss -w in a docker container (#370) and running postcss -w in lerna or turborepo.

Here is the diff that solved my problem:

diff --git a/node_modules/postcss-cli/index.js b/node_modules/postcss-cli/index.js
index 615638c..28244e6 100644
--- a/node_modules/postcss-cli/index.js
+++ b/node_modules/postcss-cli/index.js
@@ -61,7 +61,7 @@ let configFile
 if (argv.env) process.env.NODE_ENV = argv.env
 if (argv.config) argv.config = path.resolve(argv.config)
 
-if (argv.watch) {
+if (argv.watch && process.stdin.isTTY) {
   process.stdin.on('end', () => process.exit(0))
   process.stdin.resume()
 }

This issue body was partially generated by patch-package.

[RyanZim]

Continuing discussion in #424.

[RyanZim]

Ultimately fixed in #448