fix(run): Preserve none zero exit code

__tests__/integration.js

@@ -450,6 +450,30 @@ test('yarn run <failing script>', async () => {
   expect(stderr).toEqual('error Command failed with exit code 1.');
 });
 
+test('yarn run <failing script with custom exit code>', async () => {
+  const cwd = await makeTemp();
+
+  await fs.writeFile(
+    path.join(cwd, 'package.json'),
+    JSON.stringify({
+      license: 'MIT',
+      scripts: {false: 'exit 78'},
+    }),
+  );
+
+  let stderr = null;
+  let err = null;
+  try {
+    await runYarn(['run', 'false'], {cwd});
+  } catch (e) {
+    stderr = e.stderr.trim();
+    err = e.code;
+  }
+
+  expect(err).toEqual(78);
+  expect(stderr).toEqual('error Command failed with exit code 78.');
+});
+
 test('yarn run in path need escaping', async () => {
   const cwd = await makeTemp('special (chars)');
 

src/cli/index.js

@@ -24,6 +24,7 @@ import {spawnp, forkp} from '../util/child.js';
 import {version} from '../util/yarn-version.js';
 import handleSignals from '../util/signal-handler.js';
 import {boolify, boolifyWithDefault} from '../util/conversion.js';
+import {ProcessTermError} from '../errors';
 
 function findProjectRoot(base: string): string {
   let prev = null;
@@ -583,7 +584,11 @@ export async function main({
         reporter.info(command.getDocsInfo);
       }
 
-      return exit(1);
+      if (err instanceof ProcessTermError) {
+        return exit(err.EXIT_CODE || 1);
+      }
+
+      return exit((err.code && Number(err.code)) || 1);
     });
 }
 

src/util/execute-lifecycle-script.js

@@ -366,6 +366,7 @@ export async function execCommand({
         err.EXIT_SIGNAL
           ? reporter.lang('commandFailedWithSignal', err.EXIT_SIGNAL)
           : reporter.lang('commandFailedWithCode', err.EXIT_CODE),
+        String(err.EXIT_CODE),
       );
     } else {
       throw err;