Optional-chaining in Angular

Question

I'm using optional chaining on an object which in turn gives this error after compiling the code

For example

const someObj = {pet_animals: {'dog', 'cat'}};
const duplicate = someObj?.wild_animals;

tsconfig file

Error message

Answer 1

optional chaining was introduced in ES2020 freeCodecamp.org. If you are your using js version before ES2020, you will get that error.

That might be the reason why you couldn't use optional chaining,

solution:

duplicate = someObj.wild_animals ? someObj.wild_animals : undefined