fix(cli): ensure terminating due to an empty event loop counts as an …

…error

.yarn/versions/3a4fece1.yml

@@ -0,0 +1,23 @@
+releases:
+  "@yarnpkg/cli": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"

packages/yarnpkg-cli/sources/lib.ts

@@ -187,6 +187,11 @@ export async function runExit(argv: Array<string>, {cwd = ppath.cwd(), selfPath,
   const cli = getBaseCli({cwd, pluginConfiguration});
 
   try {
+    // The exit code is set to an error code before the CLI runs so that
+    // when the event loop becomes empty and node terminates without
+    // finishing this function call it counts as an error.
+    // https://github.com/yarnpkg/berry/issues/6398
+    process.exitCode = 42;
     process.exitCode = await run(cli, argv, {selfPath, pluginConfiguration});
   } catch (error) {
     Cli.defaultContext.stdout.write(cli.error(error));