Changelog

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0.2.0 - 2026-04-19

Added

  • source option for :union, :list, and :tuple types.
  • validate functions can now return :ok, :error, or {:error, reason} in addition to true/false. {:error, reason} allows custom error reasons; :ok/:error mirror true/false.

Changed

  • Dynamic maps (keys/values) now collect all entry errors instead of stopping at the first one, consistent with how fields behave.

Documentation

  • New guide: using Mold with HTTP clients.
  • New guide: formatting errors.
  • Trace examples in README and parse!/2 docstring now use atoms instead of strings.

0.1.2 - 2026-04-10

Fixed

  • Error trace now uses schema field names (atoms like [:address, :city]) instead of raw source keys (strings like ["address", "city"]) or opaque Access function references ([#Function<...>]).
  • Dynamic map trace: key parse errors no longer include the unparsed key in the trace; value errors use the parsed key.

Changed

  • Trace building now uses prepend + reverse internally instead of append.

0.1.1 - 2026-04-10

Fixed

  • nilable: true combined with default no longer replaces an explicit nil with the default value. The default now only applies to missing fields.
  • Documentation updated to reflect the corrected nilable + default interaction.

0.1.0 - 2026-04-06

Initial release.

Added

  • Mold.parse/2 and Mold.parse!/2.
  • Built-in types: :string, :integer, :float, :boolean, :atom, :date, :datetime, :naive_datetime, :time.
  • Collections: :map (fields and homogeneous), :list, :tuple.
  • Union types, custom parse functions, recursive types.
  • Shared options: nilable, default, in, transform, validate.
  • Source key mapping with propagation to nested structures.
  • Rich error traces with path to the failing value.