The title seems complicated. Let me dive into the subject matter. Take a look at an example:
export interface IUser {
id: string;
displayName: string;
email?: string;
imageUrl?: string;
disabled?: boolean;
since?: Date;
}
In a section of the code, I need to define a new variable - id.
I want this variable's type to automatically match the type of IUser's id. So if IUser is updated, the variable type updates dynamically like so:
let id:typeOf(IUser.id)
If you want to specify the type of a variable, square brackets can be used.
export interface UserAccount_1 {
username: string;
}
const username_1: UserAccount_1['username'] = 'john_doe';
export interface UserAccount_2 {
age: number;
}
const userAge: UserAccount_2['age'] = 30;
To access the value, you must employ square brackets:
const userId:IUser['userId'] = '$7'
If you modify the data type of userId in the interface, the data type of the userId variable will automatically update.
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