interface Sample {
value?: string
[prop: string]: any
}
const sampleObject: Sample = { title: 'John' }
const data = sampleObject.title
By including "any" in the interface, it eliminates the automatically assumed "string" type for the property name. This is evident when sampleObject is assigned to the Sample interface.
Is there a method to uphold the inferred type with an interface or type definition?
One way to achieve this is by utilizing a generic Record type:
type Sample<K extends PropertyKey, V> = Record<K, V> & {
// additional non-generic interface properties can be included here
value?: string
};
const xyz: Sample<'title', string> = { title: 'John' };
const a = xyz.title; // valid, recognized as string
const y = xyz.city; // invalid reference
To simplify the process and remove the need for explicit type parameters like in Sample<'title', string>, you can apply a generic identity function:
function sampleFunction<K extends PropertyKey, V>(s: Sample<K, V>): Sample<K, V> {
return s;
}
const xyz = sampleFunction({ title: 'John' });
The variable xyz will now automatically inherit the type Sample<'title', string>.
Utilizing a generic type along with a union is a great option:
type NamedEntity<T> = T & { title?: string };
const myObject: NamedEntity<{ username?: string; age?: number }> = { title: 'Hello'};
interface DictionaryStructure {
[key: string]: any
}
interface Sample extends DictionaryStructure {
title: string;
}
const testSample: Sample = { title: 'Jane' }
const x = testSample.title; // string
const y = testSample.bar; // any
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