CODEWITHSUNDEEP
typescripttypescript2.0
Stefan Steiger
Stefan Steiger

Reputation: 82396

TypeScript: How to limit interface to variable of type object?

I have the following TypeScript interface

interface ICookieOptions
{
    name?:string;
    value?:string;
    secure?:boolean;
    session?: boolean;
    sameSite?: boolean;
}

and the following class

class Cookie
{
     constructor(nameOrOptions: string | ICookieOptions)
     { [...]}
}

now I can do the following:

var testOptions = 
    {
        name:"abc",
        value:"def"
        secure: false,
        session: true,
        sameSite: true
    };    
new Cookie(testOptions);
new Cookie(123);

and get no error.
I figured this is because all elements in ICookieOptions are optional.
And as soon as i remove the ? in name?, it outputs an error on the constructor with a number.

Now: How can I have ALL elements of ICookieOptions as optional, and restrict ICookieOptions to variables of type "object" (not number, boolean, etc.) ?

Upvotes: 0

Views: 255

Answers (1)

Stefan Steiger
Stefan Steiger

Reputation: 82396

Ah, found the answer myselfs. One needs to specify & object in the type definition : 

class Cookie
{
     constructor(nameOrOptions: string | ICookieOptions & object)
     { [...]}
}

requires TypeScript v2.2+

Upvotes: 2

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