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export type Optional<T> = { [key in keyof T]?: T[key] };
export type nil = undefined | null;
type Impossible<K extends keyof any> = {    [P in K]: never;};export type NoExtraProperties<T, U extends T = T> = U & Impossible<Exclude<keyof U, keyof T>>;


export type ReplaceReturnType<T, TNewReturn> = T extends (...a: any) => any    ? (...a: Parameters<T>) => TNewReturn    : never;
export class NotSupported extends Error {    constructor(what?: string) {        super('Not supported' + (what ? ': ' + what : ''));    }
    static never(value: never, msg?: string) {        return new NotSupported(`${msg ?? ''} ${JSON.stringify(value)}`);    }}
export function trimNullish<T>(value: T, depth = 5): T {    if (depth < 0)        return value;    if (value instanceof Array) {        value.forEach(x => trimNullish(x, depth - 1))    }    if (typeof value !== 'object' || value instanceof Date)        return value;
    if (!value) {        return value;    }
    for (const k of Object.keys(value)) {        const val = (value as any)[k];        if (val === undefined || val === null)            delete (value as any)[k];        else            trimNullish(val, depth - 1);    }    return value;}