Function updateIn

src/functional/updateIn.ts:98–127

(
  collection: C,
  keyPath: KeyPath<K>,
  notSetValue: NSV | UpdaterFunction<K, C> | undefined,
  updater?: UpdaterFunctionWithNSV<K, C, NSV>
)

): { [key: PropertyKey]: V };

export function updateIn<
  K,
  V,
  TProps extends object,
  C extends PossibleCollection<K, V, TProps>,
  NSV,
>(
  collection: C,
  keyPath: KeyPath<K>,
  notSetValue: NSV | UpdaterFunction<K, C> | undefined,
  updater?: UpdaterFunctionWithNSV<K, C, NSV>
): C {
  if (!updater) {
    // handle the fact that `notSetValue` is optional here, in that case `updater` is the updater function
    // @ts-expect-error updater is a function here
    updater = notSetValue as UpdaterFunction<K, C>;
    notSetValue = undefined;
  }
  const updatedValue = updateInDeeply(
    isImmutable(collection),
    // @ts-expect-error type issues with Record and mixed types
    collection,
    coerceKeyPath(keyPath),
    0,
    notSetValue,
    updater
  );
  // @ts-expect-error mixed return type
  return updatedValue === NOT_SET ? notSetValue : updatedValue;
}

function updateInDeeply<
  K,