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I have a component which used to have a lightning:icon component as

<lightning:Icon iconName="utility:search" alternativeText="search" />

it used to work until winter 18. But I was testing on Summer 18 it was failing with error.

Component class instance initialization error [Definition does not exist on the client for descriptor:markup://lightning:Icon] Failing descriptor:

<lightning:icon iconName="utility:search" alternativeText="search" />

So difference between two is only is Icon > icon. I looked into release notes to find if salesforce has removed case insensitivity of lightning component name. I event test with different lightning components they were also not working when name is used with capital letters.

Does salesforce changed this behaviour?

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  • Hi @ManjotSingh. That's interesting. But what is the question?
    – Martin Lezer
    Commented Apr 24, 2018 at 12:30
  • does salesforce specified anywhere about this change? or this might be a bug they will fix
    – Manjot Singh
    Commented Apr 24, 2018 at 12:31
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    Lets wait for GA for Summer 18 before making any decisions. You can ask this on Release Readiness CHatter group. They seem to respond well there. success.salesforce.com/_ui/core/chatter/groups/…
    – Pranay Jaiswal
    Commented Apr 24, 2018 at 12:38
  • With lightning, assume case sensitivity for everything. In fact, assume it for ALL of your code and your peers will thank you.
    – Caspar Harmer
    Commented Apr 24, 2018 at 21:46

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Salesforce is going to roll back case sensitivity in summer 18 org. But they are saying that salesforce is going to implement case sensitivity in upcoming releases. Lightning:components were supposed to be case sensitive. They shared a link of summer 15 release notes. So you can check that all your components are case sensitive before upcoming releases.

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