Topics include:

Why Gary decided to write Execute Program as a full-stack TypeScript application instead of using a Ruby or Python backend like he may have traditionally
Do you actually have to write less tests if you have a good type system?
What does a good type system give you that tests can't give you?
Using io-ts to type check incoming data
How to think about structuring your code to best take advantage of the benefits your type system gives you and minimize the need to write tests
Pushing conditional logic to the core of your system to reduce the number of tests you need to write at the edges
The correlation between type errors and behavioral bugs, and how a type system can help you catch mistakes you don't think to test for
Do type errors signal that you're missing a test?
Structural vs. nominal type systems, and the benefits of structural type systems like used by TypeScript and Go
Best practices for type-checking within a function in a structural type system like TypeScript
The power of supporting literal types like true or "active" in addition to traditional types

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The Surprising Compassion of Christ (Luke 8:40-56)