In this example, I am demonstrating TypeScript interfaces in a simple way:
interface A: {
id: number;
email: string;
}
interface B extends A {
login: string;
password: string;
}
My goal is to have certain requirements when creating objects from these interfaces. For interface A, all properties are required. For interface B, the 'email' property from A should be optional while all other properties in B are required. Can this be achieved?
Below is the solution. You must select the email property from A:
Select<A,"email">
then, you can make it optional by using the Partial method
interface B extends Partial<Select<A,"email">>
For the full code and a playground to test it out click this link: playground
interface A {
id: number;
email: string;
}
interface B extends Partial<Select<A,"email">> {
login: string;
password: string;
}
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