How to use the @podium/schemas.validate.fallback function in @podium/schemas

if (validate.uri(pathname).error)
            throw new Error(
                `The value, "${pathname}", for the required argument "pathname" on the Podlet constructor is not defined or not valid.`,
            );

        if (validate.uri(manifest).error)
            throw new Error(
                `The value, "${manifest}", for the optional argument "manifest" on the Podlet constructor is not valid.`,
            );

        if (validate.content(content).error)
            throw new Error(
                `The value, "${content}", for the optional argument "content" on the Podlet constructor is not valid.`,
            );

        if (validate.fallback(fallback).error)
            throw new Error(
                `The value, "${fallback}", for the optional argument "fallback" on the Podlet constructor is not valid.`,
            );

        Object.defineProperty(this, 'name', {
            value: name,
        });

        Object.defineProperty(this, 'version', {
            value: version,
        });

        Object.defineProperty(this, '_pathname', {
            value: this[_sanitize](pathname),
        });