Function valueForWrite

packages/forms/signals/src/util/deep_signal.ts:51–59

* Gets an updated root value to use when setting a value on a deepSignal with the given path. * @param sourceValue The current value of the deepSignal's source. * @param newPropValue The value being written to the deepSignal's property * @param prop The deepSignal's property key * @returns An up

(sourceValue: unknown, newPropValue: unknown, prop: PropertyKey)

 * @returns An updated value for the deepSignal's source
 */
function valueForWrite(sourceValue: unknown, newPropValue: unknown, prop: PropertyKey): unknown {
  if (isArray(sourceValue)) {
    const newValue = [...sourceValue];
    newValue[prop as number] = newPropValue;
    return newValue;
  } else {
    return {...(sourceValue as object), [prop]: newPropValue};
  }
}