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// Generic function function identity<T>(value: T): T return value;

Create folder structure:

// Explicit typing let username: string = "Alice"; let age: number = 30; let isActive: boolean = true; // Type inference (hover to see TS inferred type) let city = "Paris"; // string let score = 99.5; // number pure ts tour

console.log(state, worker); src/features/6-generics.ts // Generic function function identity&lt

// Custom type guard interface Cat meow(): void; (value: T): T return value

// Type alias type ID = string | number;

console.log(updateTodo( title: "x", description: "y", completed: false , completed: true )); src/index.ts :