only allow one customer account page render

.changeset/itchy-peas-cheer.md

@@ -0,0 +1,5 @@
+---
+'@shopify/app': patch
+---
+
+Add restriction to only allow one customer account page render per extension

packages/app/src/cli/models/extensions/specifications/ui_extension.test.ts

@@ -320,6 +320,39 @@ Please check the configuration in ${uiExtension.configurationPath}`),
           err(`Duplicate targets found: EXTENSION::POINT::A
 Extension point targets must be unique
 
+Please check the configuration in ${uiExtension.configurationPath}`),
+        )
+      })
+    })
+
+    test('returns err(message) when there are both customer-account.order.page.render and customer-account.order.render targets', async () => {
+      await inTemporaryDirectory(async (tmpDir) => {
+        // Given
+        await mkdir(joinPath(tmpDir, 'src'))
+        await touchFile(joinPath(tmpDir, 'src', 'ExtensionPointA.js'))
+        await touchFile(joinPath(tmpDir, 'src', 'ExtensionPointB.js'))
+
+        const uiExtension = await getTestUIExtension({
+          directory: tmpDir,
+          extensionPoints: [
+            {
+              target: 'customer-account.order.page.render',
+              module: './src/ExtensionPointA.js',
+            },
+            {
+              target: 'customer-account.page.render',
+              module: './src/ExtensionPointB.js',
+            },
+          ],
+        })
+
+        // When
+        const result = await uiExtension.validate()
+
+        // Then
+        expect(result).toEqual(
+          err(`You can't have both 'customer-account.order.page.render' and 'customer-account.page.render'
+
 Please check the configuration in ${uiExtension.configurationPath}`),
         )
       })

packages/app/src/cli/models/extensions/specifications/ui_extension.ts

@@ -107,6 +107,12 @@ Please check the module path for ${target}`.value,
     }
   }
 
+  if (
+    uniqueTargets.indexOf('customer-account.order.page.render') >= 0 &&
+    uniqueTargets.indexOf('customer-account.page.render') >= 0
+  ) {
+    errors.push(`You can't have both 'customer-account.order.page.render' and 'customer-account.page.render'`)
+  }
   if (duplicateTargets.length) {
     errors.push(`Duplicate targets found: ${duplicateTargets.join(', ')}\nExtension point targets must be unique`)
   }