Why is my LWC not updating in Scratch Org?

Question:

I am deploying changes to a Lightning Web Component (LWC) in my scratch org using the sf project deploy start command. The command completes successfully, tracking changes in the components, and shows a correct output. However, the changes don’t appear in the scratch org. I have tried several troubleshooting steps, such as enabling Debug Mode, refreshing the org, clearing the browser cache, and uninstalling my package to eliminate interference. Despite all this, the updated LWC is not reflected in the scratch org. Instead, I have been creating new package versions and clean-installing them as a workaround. Is there a quicker solution?

Answer:

This issue often occurs when permission sets associated with the deployed components are not assigned to the user. When you deploy components using sf project deploy start, it essentially creates a new set of components, objects, and permission sets, separate from the ones installed with a 2nd generation package. You need to assign the newly created permission set to your user for the changes to appear.

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To resolve this issue, follow these steps:

1. After deploying the components, identify the newly created permission set.

For example, if your deployment creates a permission set named My_LWC_Permissions, assign it to your user using the following command:

sf force:user:permset:assign -n My_LWC_Permissions

Code explanation: This command assigns a permission set named My_LWC_Permissions to the currently logged-in user in the scratch org. When deploying an LWC or other components, Salesforce might create a new permission set to manage access to these components. Without assigning this permission set, the user cannot view or interact with the newly deployed components.

2. Verify LWC Deployment Status

Ensure the LWC is associated with the correct metadata in the org. Verify its deployment status by running:

sf project deploy report

Code explanation: This command provides a detailed report of the deployment status. It helps confirm whether the LWC and its associated metadata were successfully deployed or if any errors occurred during the process. This is useful for identifying deployment issues that could prevent the LWC from updating.

3. Clear LWC Cache via URL

Clear the LWC cache explicitly by adding a query parameter to the Lightning app URL in your browser:

https://<your-scratch-org-domain>/lightning/n/<your-app>?nocache=1

Code Explanation: Adding the ?nocache=1 parameter to the URL forces the browser to bypass cached versions of the LWC and load the latest version directly from the server. This step ensures you are viewing the most recent updates in your org.

4. Enable LWC Debug Mode

Use Debug Mode for LWCs in your scratch org to ensure you are not seeing cached results. Enable Debug Mode with this command:

sf force:lightning:lwc:start

Code explanation: This command starts the Lightning Web Component local development server in Debug Mode. Debug Mode allows you to troubleshoot LWC issues by providing detailed error messages and ensuring that development changes are reflected in real-time without browser caching interference.

5. Deploy and Activate LWC

If your LWC is part of an app or a page, make sure the app/page itself is properly deployed and activated. For example, ensure the Lightning app has the latest LWC version:

<!-- sample app metadata -->
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>57.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__RecordPage</target>
    </targets>
</LightningComponentBundle>

Code explanation: The API version (57.0) for compatibility with the org’s Lightning framework.The isExposed property as true, making the LWC available for use on app pages, record pages, or other Lightning-supported areas.The <targets> tag specifies where this LWC can be added (e.g., lightning__RecordPage allows placement on record pages).

By assigning the correct permission set to your user, you should be able to view and test the updated LWC in your scratch org without needing to create new package versions every time.

Summing Up:

If your LWC changes are not reflecting in the scratch org after deployment, the issue often lies in unassigned permission sets created during deployment or browser caching problems. Ensuring the correct permission set is assigned to your user is critical, as it grants access to the newly deployed components. Additionally, verify the deployment status, enable Debug Mode for real-time updates, and clear the browser cache or use a ?nocache=1 URL parameter to load the latest version of the component. Proper metadata configuration and these troubleshooting steps can save time and eliminate the need for unnecessary package installations, streamlining your development process.

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