transformers/map library

Map and structure transformers.

This file contains transformers for working with Map structures, including picking keys, plucking values, and flattening nested maps.

Functions

flattenMapKeys(String delimiter, IValidator child, {String? message}) → IValidator

Flattens a nested Map structure into a single-level Map using the provided delimiter. Only flattens nested Maps (non-Map values become leaves). Arrays/lists are left as-is.

getField(String key, IValidator inner) → IValidator

Extracts and validates a field from a map.

pickKeys(Iterable<String> keys, IValidator child, {String? message}) → IValidator

Picks a subset of keys from a Map, producing a new Map with only those keys present (if they existed). Fails if input is not a Map.

pluckKey(String key, IValidator child, {String? message}) → IValidator

Plucks a single key's value from a Map (similar to getField but transform style).