Function any

expect.any() matches any object instance created from the constructor or a corresponding primitive type. Use it inside expect(value).toEqual(expected) to perform pattern matching.

Usage

// Match instance of a class.
class Example {}
expect(new Example()).toEqual(expect.any(Example));

// Match any number.
expect({ prop: 1 }).toEqual({ prop: expect.any(Number) });

// Match any string.
expect('abc').toEqual(expect.any(String));
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