Occurrence of null or undefined property leading to a 'nonexistent' error message

Trying to understand the correct approach for destructuring a returned object.

Below is the TypeScript code snippet:

const id = 1;
const { film: { title, director } } = await getEvent({ id });

Encountering errors for both title and director with message: 

Property does not exist on type film
. Hovering over film reveals its type:

(property) film?: {
    title?: string | null | undefined;
    director?: string | null | undefined;
    ... and 10 more ...;
} | undefined

How can I convey to the compiler that these properties do indeed exist without altering the type of title and director to be non-optional?

typescript

Answer №1

To bring a smile to the TypeScript compiler's face, just provide default values like so:

const { movie: { name = '', filmmaker = '' } = {} } = await fetchEvent({ id });

Answer №2

let movie: { 
              name: string | null | undefined,
              director: string | null | undefined 
             } = await fetchMovieDetails({ id });

Ensure that your variable is properly named (movie) and that its type is specified after :

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