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import { Key, Values } from "../libs/types.ts";import { CAUSE, ValueSchemaError } from "../libs/ValueSchemaError.ts";export interface Options<T> {    ifNull?: T | null;}/** * apply schema * @param values input/output values * @param options options * @param keyStack key stack for error handling * @returns applied value */export function applyTo<T>(values: Values, options: Options<T>, keyStack: Key[]): values is Values<T> {    if (values.output !== null) {        return false;    }    if (options.ifNull !== undefined) {        values.output = options.ifNull;        return true;    }    return ValueSchemaError.raise(CAUSE.NULL, values, keyStack);}