typescript-core-development

Type-safe TypeScript uses advanced generics with constraints to build reusable abstractions. Define generic interfaces with explicit type parameters, apply utility types to compose and transform types, and use strict typing rules to catch errors at compile time rather than runtime.

Discriminated unions are types that combine related values with a shared literal field to manage complex state safely. Use them to represent data that can be one of several distinct shapes, enabling TypeScript to narrow types automatically based on the discriminator field.

Use the Result or Either pattern to represent success or failure as explicit types rather than throwing exceptions. This approach returns a type containing either a successful value or an error, enabling functional error handling with type safety and composable error flows.

Type guards are functions that narrow types at runtime by checking values and returning type predicates. Define custom type guards with the `is` keyword or use built-in guards like `typeof` and `instanceof` to safely narrow union types before accessing type-specific properties.

Yes, TypeScript supports functional programming with immutability, pure functions, and composable abstractions. Combine generics, discriminated unions, and utility types to build pipelines and higher-order functions that maintain type safety across transformations.

TypeScript requires compilation to check types; run `tsc --noEmit` to verify types without emitting JavaScript. This step catches type errors before runtime and is essential for strict type checking in development workflows.