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// This module "extends" ef.js with a helper function named `map`
import { derived, isReactive, type ReactiveOrStatic } from "../../src/ef.js";

export * from "../../src/ef.js";

/**
 * Applies function `f` for `x` when `x` is not `ReactiveValue`, otherwise
 * Returns a Derived that value is a result of `f(x.get())`.
 *
 * Convenient helper to dealing with `ReactiveOrStatic`.
 * Useful for composing.
 */
export function map<T, P>(
  x: ReactiveOrStatic<T>,
  f: (x: T) => P,
): ReactiveOrStatic<P> {
  if (isReactive(x)) {
    return derived(() => f(x.get()));
  }

  return f(x);
}