osu-api-v2-js
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    Type Alias Grade

    Grade: "XH" | "X" | "SH" | "S" | "A" | "B" | "C" | "D" | "F"

    The letters that kinda allow you to tell at a glance how good the score is

    XH is better known as a Silver SS, and SH as a Silver S, while F is a failed score https://osu.ppy.sh/wiki/en/Gameplay/Grade