Advanced TypeScript Patterns for Enterprise Applications

TypeScript's type system is incredibly powerful. Let's explore advanced patterns that improve code quality and developer experience.

Conditional Types

type IsString<T> = T extends string ? true : false;
type Result = IsString<"hello">; // true

Mapped Types

type Readonly<T> = {
  readonly [K in keyof T]: T[K];
};

Template Literal Types

type Color = "red" | "blue";
type Quantity = "one" | "two";
type ColoredQuantity = `${Quantity}-${Color}`;

Real-World Application

These patterns enable:

• Type-safe API clients
• Runtime validation with Zod
• Better IDE autocomplete
• Compile-time error detection

Performance Considerations

While powerful, complex types can slow down compilation. Balance type safety with build performance.