fix: forward exit codes

packages/build/src/build.js

@@ -21,6 +21,15 @@ const localConfig = (filename) => {
   return configFile;
 };
 
+const forwardProcessCode = (child) => new Promise((resolve, reject) => {
+  child.on('error', reject);
+  child.on('exit', (code) => {
+    child.off('error', reject);
+    process.exitCode = code;
+    resolve();
+  });
+});
+
 const build = async (args = []) => {
   const {production} = program.opts();
   const babelConfigFile = localConfig('.babelrc.js');
@@ -53,13 +62,7 @@ const build = async (args = []) => {
       stdio: 'inherit',
     },
   );
-  return new Promise((resolve, reject) => {
+  return forwardProcessCode(child);
-    child.on('error', reject);
-    child.on('exit', (code) => {
-      child.off('error', reject);
-      resolve(code);
-    });
-  });
 };
 
 program
@@ -106,13 +109,7 @@ const unpublish = async () => {
       stdio: 'inherit',
     },
   );
-  return new Promise((resolve, reject) => {
+  return forwardProcessCode(child);
-    child.on('error', reject);
-    child.on('exit', (code) => {
-      child.off('error', reject);
-      resolve(code);
-    });
-  });
 };
 
 const publish = async () => {
@@ -125,13 +122,7 @@ const publish = async () => {
       stdio: 'inherit',
     },
   );
-  return new Promise((resolve, reject) => {
+  return forwardProcessCode(child);
-    child.on('error', reject);
-    child.on('exit', (code) => {
-      child.off('error', reject);
-      resolve(code);
-    });
-  });
 };
 
 program
@@ -145,7 +136,7 @@ program
 
 const lint = () => {
   const configFile = localConfig('.eslintrc.js');
-  spawn(
+  const child = spawn(
     'eslint',
     [
       '--config',
@@ -164,6 +155,7 @@ const lint = () => {
       stdio: 'inherit',
     },
   );
+  return forwardProcessCode(child);
 };
 
 program
@@ -178,7 +170,7 @@ const test = async () => {
     process.argv.splice(watchIndex, 1);
   }
   await build(['--display', 'none']);
-  spawn(
+  const child = spawn(
     'mocha',
     (-1 === watchIndex ? [] : ['--watch'])
       .concat([
@@ -193,6 +185,7 @@ const test = async () => {
       stdio: 'inherit',
     },
   );
+  return forwardProcessCode(child);
 };
 
 program