create store per property of object svelte

svelte-store-per-object-property.ts

const buildPropertyWritables = <TFormData extends object>(data: TFormData) => {
  const writables: Record<string, Writable<any>> = {};

  Object.keys(data).forEach((key) => {
    writables[key] = writable(data[key as keyof TFormData]);
  })

  return writables as Record<keyof TFormData, Writable<any>>;
}