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=== tests/cases/compiler/optionalPropertiesSyntax.ts ===
interface fnSigs {
//functions signatures can be optional
fn(): void;
>fn : { (): void; (): void; }
fn?(): void; //err
>fn : { (): void; (): void; }
fn2?(): void;
>fn2 : () => void
}
interface callSig {
//Call signatures can't be optional
(): any;
()?: any; //err
>any : any
?(): any; //err
}
interface constructSig {
//Construct signatures can't be optional
new (): any;
new ()?: any; //err
>any : any
new ?(): any; //err
>new : () => any
}
interface propertySig {
//Property signatures can be optional
prop: any;
>prop : any
prop?: any;
>prop : any
prop2?: any;
>prop2 : any
}
interface indexSig {
//Index signatures can't be optional
[idx: number]: any;
>idx : number
[idx: number]?: any; //err
>idx : number
>any : any
? [idx: number]: any; //err
>idx : number
[idx?: number]: any; //err
>idx : number
}
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