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Create folder structure:

function createUser(user: User): User return user; pure ts tour

// Literal types let direction: "north" | "south" | "east" | "west"; direction = "north"; // OK // direction = "up"; // Error direction = "north"

// Special types let notSure: any = 42; // escape type checking (use sparingly) let noValue: void = undefined; let missing: null = null; // OK // direction = "up"

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

const worker: Worker = name: "Eve", id: 42 ;

src/ index.ts types/ features/ Create src/features/1-basic-types.ts :