fix(build): ensure build fails when types building fails (#4812)

* fix(build): ensure build fails when types building fails

* Apply suggestions from code review

Co-authored-by: Haroen Viaene <hello@haroen.me>

* Update scripts/release/build-experimental-typescript.js

Co-authored-by: Haroen Viaene <hello@haroen.me>

Author: tkrugg

scripts/release/build-experimental-typescript.js

@@ -19,5 +19,11 @@ fs.writeFileSync(
   `export default '${newVersion}';\n`
 );
 
-shell.exec(`NODE_ENV=production VERSION=${newVersion} yarn build`);
-shell.exec('yarn build:types');
+const results = [
+  shell.exec(`NODE_ENV=production VERSION=${newVersion} yarn build`),
+  shell.exec('yarn build:types'),
+];
+
+if (results.some(({ code }) => code !== 0)) {
+  shell.exit(1);
+}