redacted.ts

declare const _: unique symbol;
export interface Redacted<out T> extends Symbol {
  [_]: T
}

const redactMap = new WeakMap();

export const init = <const T>(val: T): Redacted<T> => {
  const sym = Symbol('<redacted>');
  redactMap.set(sym, val);
  return sym as any as Redacted<T>;
}

export const value = <const T>(redacted: Redacted<T>): T => redactMap.get(redacted);