Objects Verifier Reference

Created by should().objects<T extends {}, P extends {}>(entry: T, other: P) — both objects are required up front. The modifier methods configure the comparison; equal() runs it.

Methods

Method	Role
`equal()`	runs the deep comparison (inverted by a preceding `not`)
`rule<K>(prop: K, checker: (o1: T[K], o2: T[K]) => boolean)`	custom equality for one property; repeatable
`map<K, L>(name1: K, name2: L)`	compare property `name1` of the first object against `name2` of the second
`ignoring(...props)`	exclude properties from the comparison
`compareOnly(...props)`	exclusive whitelist of properties; overrides `ignoring`

Order matters: modifiers first, equal() last. Plus the inherited not and defined().

Comparison semantics

Property counts of the two sides must match (after map renames and exclusions).
Nested objects are compared recursively; nested object values without a rule fall back to reference equality; Date properties compare by string representation.
A failing rule reports Objects failed custom rule for '<field>'.

Representative messages

The objects has different number of properties.
Objects have different '<path>': <val1> & <val2>. — the path includes nesting (user.address.city).

Guide: Objects.

02 сентября 2026