check array length and only add newlines if length > 0

Signed-off-by: Max Falk <gmdfalk@gmail.com>

packages/cli/src/lib/builder/packager.test.ts

@@ -23,6 +23,16 @@ describe('formatErrorMessage with esbuild plugin error', () => {
       plugin: 'esbuild',
       message: 'test',
     });
-    expect(msg).toBe('test\n\n');
+    expect(msg).toBe('test');
+  });
+  it('given error with errors array then error message should have new lines', () => {
+    const msg = formatErrorMessage({
+      code: 'PLUGIN_ERROR',
+      plugin: 'esbuild',
+      message: 'test',
+      id: 'index.js',
+      errors: [{ text: 'Dummy', location: { line: 1, column: 1 } }],
+    });
+    expect(msg).toContain('test\n\n');
   });
 });

packages/cli/src/lib/builder/packager.ts

@@ -27,8 +27,9 @@ export function formatErrorMessage(error: any) {
 
   if (error.code === 'PLUGIN_ERROR') {
     if (error.plugin === 'esbuild') {
-      msg += `${error.message}\n\n`;
-      if (error.errors) {
+      msg += `${error.message}`;
+      if (error.errors?.length) {
+        msg += `\n\n`;
         for (const { text, location } of error.errors) {
           const { line, column } = location;
           const path = relativePath(paths.targetDir, error.id);