mapWithArguments

Resolve a destination member with source data and arguments supplied for one map invocation.

Define the member resolver:

forMember(
  (destination) => destination.tax,
  mapWithArguments((source, extraArguments) => {
    const percentage = extraArguments.percentage as number;
    return source.price * percentage;
  }),
);

Supply arguments through MapOptions.extraArgs:

const dto = mapper.map(item, Item, ItemDto, {
  extraArgs: () => ({ percentage: 0.5 }),
});

The resolver may also be an object implementing Resolver<TSource, TExtraArguments, TReturnValue>.

In v9, selectors and resolvers may return promises when you call mapAsync() or mapArrayAsync():

const dto = await mapper.mapAsync(item, Item, ItemDto, {
  extraArgs: () => ({ region: 'us-east' }),
});