TypeScript has become the industry standard for professional JavaScript development. This roadmap helps JavaScript developers master TypeScript — from basic types to advanced patterns.
Last updated: March 2026 · 2 Months plan
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TypeScript is no longer optional — it's the default for professional web development. Over 80% of new projects and major frameworks (Next.js, Angular, Deno) use TypeScript. It catches bugs before they reach production, provides better IDE support with autocompletion, and makes large codebases maintainable. Companies like Google, Microsoft, Airbnb, and Stripe mandate TypeScript. Learning it directly increases your employability and salary potential by $10,000-$20,000 compared to JavaScript-only developers.
Week 1: Basics — type annotations, primitive types, arrays, objects, union types, and type narrowing. Week 2: Intermediate — interfaces, type aliases, enums, optional properties, and function types. Week 3: Advanced — generics, utility types (Partial, Pick, Omit), conditional types, and mapped types. Week 4: Practical — TypeScript with React (typed props, hooks, events), API response typing, and configuration. Week 5-6: Real-world patterns — discriminated unions, type guards, declaration files, and migrating a JS project to TS. Week 7-8: Build a fully typed project end-to-end.
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