Function formatTime

test/spec/fast-compactor-test.js:169–174

    afterAll(() => {
      // Format time value
      const formatTime = time => {
        if (time < 0.001) return `${(time * 1_000_000).toFixed(2)} ns`;
        if (time < 1) return `${(time * 1000).toFixed(2)} µs`;
        if (time < 1000) return `${time.toFixed(2)} ms`;
        return `${(time / 1000).toFixed(2)} s`;
      };

      const lines = [
        "",