Evaluating the 'tagged' Function in TypeScript: A Good or Bad Idea?

I would like test the feeling about a "tagged" function

export interface Parser{
_tag:"Parser";
(input:string)=>string;
}

export interface Parser{
_tag:"Parser";
(input:string)=>string;
}

export interface Parser{
_tag:"Parser";
(input:string)=>string;
}

export interface Parser{
_tag:"Parser";
(input:string)=>string;
}

good idea ? or bad idea ?

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