TypeScript 2025 Curriculum: Where to Start Learning

TypeScript Learning Plan 2025: Where to Start and How Not to Get Lost

TypeScript has firmly established itself as one of the most in-demand languages in web development. By 2025, it has become the de facto standard for large projects, and its ecosystem has grown to incredible proportions. If you've decided to master TypeScript this year — you're on the right track. We have prepared a structured learning plan that will help you go from a beginner to a confident Middle developer.

Why TypeScript in 2025?

TypeScript is not just "JavaScript with types". It is a powerful type system that allows you to catch errors at compile time, improves code readability, and makes refactoring safe. In 2025, almost 80% of Frontend and Fullstack developer vacancies require knowledge of TypeScript. Major frameworks (Angular, Next.js, NestJS) are either built entirely on it or have first-class support.

Stage 1. Basics (2–3 weeks)

• Basic types: string, number, boolean, null, undefined, void, never.
• Interfaces and types: interface vs type, extending (extends), union, intersection.
• Functions: typing parameters and return values, optional parameters, overloading.
• Arrays and tuples: Array<T>, readonly, tuple types.
• Enum: numeric and string enumerations.

Practice: write a small library for working with geometric shapes with full typing.

Stage 2. Advanced Types (2–3 weeks)

• Generics: generic functions, classes and interfaces, constraints (extends).
• Conditional types: T extends U ? X : Y, infer.
• Mapped types: Partial, Required, Readonly, Pick, Omit, Record.
• Template literal types: working with string literals at the type level.
• Utility types: Awaited, ReturnType, Parameters, ConstructorParameters.

Practice: implement your own version of the Partial and Pick utilities without using built-in ones.

Stage 3. TypeScript in Real Projects (3–4 weeks)

• Working with the DOM: typing events, HTMLElement, querySelector.
• Modules and namespaces: export/import, declarations (.d.ts).
• Configuring tsconfig.json: strict mode, target, module, paths.
• Integration with React: FC, PropsWithChildren, useState, useRef, event handlers.
• Working with API: typing fetch, axios, error handling.

Practice: create a small application using React + TypeScript (for example, a task list) with full typing of state and props.

Stage 4. Advanced Topics (2–3 weeks)

• Decorators: class and method decorators (relevant for Angular and NestJS).
• Types for third-party libraries: @types/*, ambient declarations.
• Typing Redux Toolkit: createSlice, createAsyncThunk, useAppSelector.
• Testing: Jest + ts-jest, type testing (expect-type).
• Performance