Function toStrictEqualMatcher

Compares contents of the value with contents of expected and their types.

Differences from expect(value).toEqual(expected):

• Keys with undefined properties are checked. For example, { a: undefined, b: 2 } does not match { b: 2 }.
• Array sparseness is checked. For example, [, 1] does not match [undefined, 1].
• Object types are checked to be equal. For example, a class instance with fields a and b will not equal a literal object with fields a and b.

Usage

const value = { prop: 1 };
expect(value).toStrictEqual({ prop: 1 });
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