Cho hàm số $f\left(x\right)$ xác định và liên tục trên $ℝ$ và có đạo hàm $f^{\prime }\left(x\right)$ thỏa mãn $f^{\prime }\left(x\right)=\left(1-x\right)\left(x+2\right)g\left(x\right)+2018$ với $g\left(x\right)<0$ ; $\forall x\in ℝ$ . Hàm số $y=f\left(1-x\right)+2018x+2019$ nghịch biến trên khoảng nào?

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