Add a type system to an existing JavaScript codebase gradually, using types to catch real bugs rather than to satisfy the compiler.
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$15
Lifetime access · no subscription
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project-based
build · ship · explain
Curriculum
Work through 8 lessons across a structured 9 hour course designed around practical application.
Strict mode, the type system, and what types are for.
Types for data that comes from outside your code.
Reusable types without type-level cleverness.
Adding types without a rewrite.
Projects
Complete focused builds that connect individual lessons into demonstrable development workflows.
Build 01
Give an untyped fetch wrapper end-to-end types from response to UI.
Build 02
Add types to one folder of an existing app without breaking the build.
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Course FAQ
Yes. The Full-Stack Web Development Bootcamp and the Web Development Freelancing course both start from absolute first principles and assume no prior coding experience. The AI-Powered Web Development course is written for developers who already ship code, and states its prerequisites on the course page before you buy.
Not for the beginner courses. You need a computer with an internet connection, a code editor, and the willingness to build things that do not work yet. If you have never written code before, start with the Full-Stack Web Development Bootcamp.
Completely. There are no live sessions, no cohort schedule and no deadlines. Lessons are unlocked the moment your purchase is confirmed and you can work through them in any order you prefer, on any device.
Yes. Every purchase is a one-time payment for lifetime access to that course, including future updates to its lessons. We do not run subscriptions, renewals or automatic charges.
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Add a type system to an existing JavaScript codebase gradually, using types to catch real bugs rather than to satisfy the compiler.