/** Parses `provider/model[#variant]`; `name` prefixes the error for the offending option. */
export function model(reference: string, name: string) {
    const [path = "", variant] = reference.split("#");
    const slash = path.indexOf("/");
    if (slash <= 0) throw new Error(`${name} must be provider/model[#variant]: ${reference}`);
    const providerID = path.slice(0, slash);
    const id = path.slice(slash + 1);
    return variant ? { providerID, id, variant } : { providerID, id };
}