function toBeNegativeInfinity(matchersUtil) {
      return {
        compare: function (actual) {
          const result = {
            pass: actual === Number.NEGATIVE_INFINITY,
          };

          if (result.pass) {
            result.message = 'Expected actual not to be -Infinity.';
          } else {
            result.message = function () {
              return 'Expected ' + matchersUtil.pp(actual) + ' to be -Infinity.';
            };
          }

          return result;
        },
      };
    }
{@link expect} the actual value to be `-Infinity` (-infinity).
@function
@name matchers#toBeNegativeInfinity
@since 2.6.0
@example
expect(thing).toBeNegativeInfinity();