keycloakify/src/tools/structuredCloneButFunctions.ts

Framework to create custom Keycloak UIs

import "./Object.fromEntries";

/**
 * Functionally equivalent to structuredClone but
 * functions are not cloned but kept as is.
 * (as opposed to structuredClone that chokes if it encounters a function)
 */
export function structuredCloneButFunctions<T>(o: T): T {
    if (!(o instanceof Object)) {
        return o;
    }

    if (typeof o === "function") {
        return o;
    }

    if (o instanceof Array) {
        return o.map(structuredCloneButFunctions) as any;
    }

    return Object.fromEntries(
        Object.entries(o).map(([key, value]) => [key, structuredCloneButFunctions(value)])
    ) as any;
}