If stderr is not a tty, be silent by default

* Fixes #517
* Refs jesseduffield/lazygit#2716

README.md

@@ -16,7 +16,7 @@
 </p>
 
 
-# tea/cli 0.35.4
+# tea/cli 0.35.5
 
 `tea` puts the whole open source ecosystem at your fingertips:
 

src/hooks/useConfig.ts

@@ -127,9 +127,13 @@ function getVerbosity(env: Record<string, string>, sequences_ok: boolean): Verbo
   const verbosity = flatmap(VERBOSE, parseInt)
   if (isNumber(verbosity)) {
     return verbosity
-  } else if (parseBool(CI) || !sequences_ok) {
+  } else if (parseBool(CI)) {
     // prevents dumping 100s of lines of download progress
     return Verbosity.quiet
+  } else if (!Deno.isatty(Deno.stderr.rid)) {
+    return Verbosity.silent
+  } else if (!sequences_ok) {
+    return Verbosity.quiet
   } else {
     return Verbosity.normal
   }