Is there a way to dereference an optional field from an interface in the following scenario?
interface Sample {
key1?: Array<Obj1>
}
interface Obj1 {
a?: Obj2;
}
interface Obj2 {
b?: string;
}
const a: Sample["key1"][number]["a"]["b"] = "asd";
Whenever I try this, I encounter an error at Sample["key1"][number] with the message
Type 'Obj1[] | undefined' has no matching index signature for type 'number'.Any insights on how to overcome this obstacle would be greatly appreciated!
To successfully index with NonNullable, be sure to eliminate null and undefined at each step:
const a: NonNullable<NonNullable<Sample["key1"]>[number]["a"]>["b"] = "asd";
When working with Sample["key1"], keep in mind that it could potentially be Obj1[]or even undefined. Here's a suggestion to consider:
Sample["key1"]?[number]
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