How can I update Lightning Message Channel exposure settings in deployed managed packages?
Answer
To update Lightning Message Channel exposure settings in deployed managed packages:
**General Process:**
1. **Create New Channel**: Create a new Lightning Message Channel with the desired `isExposed` setting (typically `false`)
2. **Update References**: Replace all references to the previous channel with references to the new one
3. **Remove Old Channel**: Once changes are implemented, remove the old channel from the package
4. **Submit for Review**: Resubmit the updated package for security review
**Important Limitations:**
- Developers cannot directly modify the exposure settings (`isExposed`) of an existing Lightning Message Channel in a released managed package
- Changes require creating a new channel rather than modifying existing ones
**Handling Breaking Changes:**
1. Ensure the `isExposed` attribute is set to `false` to align with security requirements
2. If future packages require communication and the channel needs exposure, ensure data is non-sensitive
3. Consider requesting exceptions with detailed documentation
4. Create new message channels with appropriate settings for specific use cases
**Maintaining Customer Functionality:**
- Document changes and submit for follow-up security review
- If existing exposed channels are required for other package communication, ensure data is non-sensitive
- Consider providing migration guidance to customers
**Handling Intentional Exposure Warnings:**
1. Ensure exposure is justified and aligns with security guidelines
2. Confirm data being communicated is non-sensitive
3. Document necessity and provide clear explanation during security review
4. Consider creating new channels with `isExposed=false` for internal communication
**Platform Limitations:**
When message channel metadata cannot be removed due to platform limitations:
1. Set `isExposed` attribute to `false` to limit exposure
2. Ensure communicated data is non-sensitive if channel needs to communicate with other packages
3. Document necessity in a false positive report for security review submission
How can I update Lightning Message Channel exposure settings in deployed managed packages?
Recommended Answer Update
To update Lightning Message Channel exposure settings in deployed managed packages:
**General Process:**
1. **Create New Channel**: Create a new Lightning Message Channel with the desired `isExposed` setting (typically `false`)
2. **Update References**: Replace all references to the previous channel with references to the new one
3. **Remove Old Channel**: Once changes are implemented, remove the old channel from the package
4. **Submit for Review**: Resubmit the updated package for security review
**Important Limitations:**
- You can't directly modify the exposure settings (`isExposed`) of an existing Lightning Message Channel in a released managed package
- Changes require creating a new channel rather than modifying existing ones
**Handling Breaking Changes:**
1. Set the `isExposed` attribute to `false` to align with security requirements
2. If future packages require communication and the channel needs exposure, ensure data is non-sensitive
3. Consider requesting exceptions with detailed documentation
4. Create new message channels with appropriate settings for specific use cases
**Maintaining Customer Functionality:**
- Document changes and submit for follow-up security review
- If existing exposed channels are required for other package communication, ensure data is non-sensitive
- Consider providing migration guidance to customers
**Handling Intentional Exposure Warnings:**
1. Ensure exposure is justified and aligns with security guidelines
2. Confirm data being communicated is non-sensitive
3. Document necessity and provide clear explanation during security review
4. Consider creating new channels with `isExposed=false` for internal communication
**Platform Limitations:**
When message channel metadata can't be removed due to platform limitations:
1. Set `isExposed` attribute to `false` to limit exposure
2. Ensure communicated data is non-sensitive if channel needs to communicate with other packages
3. Document necessity in a false positive report for security review submission
Reasoning
The main improvements focus on making the content more conversational and direct while maintaining all existing information. Changes include: removing unnecessary verbose phrasing ('Developers cannot' became 'You can't'), making language more natural and conversational, and improving flow and readability. The core technical information remains unchanged. I selected the AvoidLmcIsExposedTrue rule because this FAQ specifically addresses Lightning Message Channel exposure settings and the `isExposed` attribute, which is exactly what this security rule monitors. The FAQ discusses best practices for setting `isExposed=false` and handling scenarios where channels need exposure, directly relating to the rule's purpose of flagging when `isExposed=true` is used inappropriately.