TypeScript for Application Developers

09:00 – 10:15

See what TypeScript actually buys you

types as documentation, the true cost of any, strict mode first

Takeaway A bug that shipped in JavaScript caught at compile time in front of you: the argument for the next two days, made by the compiler.

10:30 – 11:45

Model your data honestly

interfaces vs type aliases, unions and literals, optional vs undefined

Takeaway A real domain modelled in types precise enough that invalid states stop compiling: not just annotated, modelled.

12:00 – 13:00

Narrow like the compiler thinks

type narrowing, guards, discriminated unions

Takeaway A discriminated union replacing a chain of if-and-hope, with the compiler proving every case is handled.

14:00 – 15:15

Use generics without fear

generic functions, constraints, when a generic is showing off

Takeaway One utility written three ways (untyped, over-generic and right), and the judgment to tell them apart.

15:30 – 17:00

Type the module boundaries

modules and exports, third-party types, declaration files

Takeaway A dependency without types given honest ones, and the module boundary of your own code typed like a public API.

09:00 – 10:15

Type an API end to end

typed request and response models, fetch with types, compile time vs runtime

Takeaway An API consumed through types the whole team can trust, and the moment a renamed field breaks the build instead of the page.

10:30 – 11:45

Validate at the edge

schema validation, parse don't assert, error types

Takeaway External data parsed into guaranteed types at the boundary: a lying API caught at the edge, not three components deep.

12:00 – 13:00

Type asynchronous code properly

typing promises and async flows, error handling, loading states as types

Takeaway Loading, success and failure as one union type: the impossible "loaded but no data" state now unrepresentable.

14:00 – 15:15

Turn strict mode on in a real codebase

migration strategy, killing any deliberately, incremental strictness

Takeaway A genuinely loose file brought under strict mode live, with the order of operations you will reuse at work.

15:30 – 17:00

Type a small app front to back

the capstone conversion, review, what React and Angular expect of you

Takeaway A small application typed end to end under strict mode, and exactly the TypeScript your framework course now gets to skip.