omit.ts

export class Filters {
    public readonly format = 'JSON';

    constructor(
        public zone: 'ASI' | 'EUR' | 'USA',
        public currency: 'EUR' | 'USD',
        public userId: number
    ) { }
}

export type EditableFilters = keyof Omit<Filters, 'format'>;

// Typescript version lower than 3.5
// export type EditableFilters = keyof Pick<Filters, Exclude<keyof Filters, 'format'>>;