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Developing Salesforce Lightning Components that are visible at design time but not at runtime

So this can clearly be labelled as a "Lightning Lesson from the Field". As you start to develop more complicated Salesforce Lightning applications - and why wouldn't you - you as I have done start seeing great power in hidden components. By hidden components I mean components that contribute code or does "something" but which does not have a UI. Thes are very easy to do but have a big drawback as they are also invisible at design time making them near impossible to find the Lightning AppBuilder. To work around this I've come up with a hack that has proven itself very useful.

By using a combination of two simple attributes and 3 lines of JavaScript I can make the component markup visible at design time but invisible at runtime. Or if I need to toggle it on for runtime as well using an attribute I can set from the Lightning AppBuilder.

The video below goes more in depth and illustrates the concept. Happy coding.