Class HttpParams

new HttpParams(
    source?:
        | null
        | string
        | {
            [param: string]: | string
            | number
            | boolean
            | readonly (string | number | boolean)[];
        },
    options?: { encoder?: HttpParameterCodec },
): HttpParams

append(param: string, value: string | number | boolean): HttpParams

appendAll(
    params: {
        [param: string]:
            | string
            | number
            | boolean
            | readonly (string | number | boolean)[];
    },
): HttpParams

delete(param: string, value?: string | number | boolean): HttpParams

get(param: string): null | string

getAll(param: string): null | string[]

has(param: string): boolean

keys(): string[]

set(
    param: string,
    value: string | number | boolean | readonly (string | number | boolean)[],
): HttpParams

toString(): string