Error "requires an imported helper but module 'tslib' cannot be found" when using ES2015 modules in TypeScript

Hello everyone! I'm new to TypeScript and trying to set up a project. I have a simple index.ts file with this code: ```typescript class User { constructor(public name: string, public age: number) {} greet() { return `Hello, my name is ${this.name}`; } } const user = new User("Anna", 25); console.log(user.greet()); ``` In my tsconfig.json I specified: ```json { "compilerOptions": { "target": "ES5", "module": "ES2015", "outDir": "./dist", "strict": true } } ``` When I run compilation via `tsc`, I get this error: ``` error TS2802: This syntax requires an imported helper but module 'tslib' cannot be found. ``` I've googled this error but don't fully understand what "imported helper" means and wh