TypeScript · Intermediate

TypeScript for Real Projects

Turn familiar JavaScript into dependable application code. Model valid states, preserve types through reusable helpers, validate external data and build an independent typed release planner. Includes two checkpoints and a local compiler workflow.

5 h 30 min12 of 12 lessons live12 coding challenges

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Curriculum

5 modules, 12 lessons, built to be done in order.

01Types you will actually writeInference, missing values and valid states.4 lessons

Annotations and inferenceconcept · 18 min
Missing values without assertionspractice · 22 min
Unions and narrowingchallenge · 24 min
Checkpoint: shipment decisionschallenge · 30 min

02Reusable application contractsGenerics, derived types and component APIs.3 lessons

Generics without the headachechallenge · 26 min
Derive types and safe updatespractice · 24 min
Typing component propspractice · 24 min

03Data you can trustValidate unknown input and model async outcomes.3 lessons

Validate before you trustpractice · 28 min
Typed async resultspractice · 28 min
Checkpoint: account importerchallenge · 35 min

04Compiler and behavior checksUse both kinds of evidence before shipping.1 lessons

Strict checks and type regression testspractice · 26 min

05Independent projectCombine validation, state models and typed transformations.1 lessons

Capstone: release plannerchallenge · 45 min