Lessons
TypeScript · Medium
TypeScript · Medium. Ten lessons. Open-book quizzes. Lesson 1 free.
10 lessons · The Host · Lesson 1 free
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Lesson 1 · On the house
Conditional types
T extends U ? X : Y.
Lesson 2
infer in practice
Unpack arrays and promises.
Lesson 3
Template literal types
Patterned strings.
Lesson 4
Module resolution
node16, bundler, paths.
Lesson 5
JSX and .tsx
Typing components lightly.
Lesson 6
Branded types
Nominal-ish IDs.
Lesson 7
Exhaustiveness with never
Switch must cover all tags.
Lesson 8
Checker performance
Keep types tractable.
Lesson 9
Variance sketch
Assignability of generics.
Lesson 10
Medium capstone
Result discriminated union.
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