[firehose] Set exit code and return instead of calling exit(X)

pkgs/firehose/CHANGELOG.md

@@ -1,3 +1,5 @@
+## 1.0.0-wip
+
 ## 0.10.2
 
 - Don't check licenses of generated files in PR health workflow.

pkgs/firehose/bin/firehose.dart

@@ -20,7 +20,7 @@ void main(List<String> arguments) async {
 
     if (argResults[helpFlag] as bool) {
       _usage(argParser);
-      exit(0);
+      return;
     }
 
     final validate = argResults[validateFlag] as bool;
@@ -34,15 +34,17 @@ void main(List<String> arguments) async {
     if (!validate && !publish) {
       _usage(argParser,
           error: 'Error: one of --validate or --publish must be specified.');
-      exit(1);
+      exitCode = 1;
+      return;
     }
 
     final github = GithubApi();
     if (publish && !github.inGithubContext) {
       _usage(argParser,
           error: 'Error: --publish can only be executed from within a GitHub '
               'action.');
-      exit(1);
+      exitCode = 1;
+      return;
     }
 
     final firehose = Firehose(Directory.current, useFlutter, ignoredPackages);
@@ -54,7 +56,8 @@ void main(List<String> arguments) async {
     }
   } on ArgParserException catch (e) {
     _usage(argParser, error: e.message);
-    exit(1);
+    exitCode = 1;
+    return;
   }
 }
 

pkgs/firehose/pubspec.yaml

@@ -1,6 +1,6 @@
 name: firehose
 description: A tool to automate publishing of Pub packages from GitHub actions.
-version: 0.10.2
+version: 1.0.0-wip
 repository: https://github.com/dart-lang/ecosystem/tree/main/pkgs/firehose
 
 environment: