wowkit API
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    Interface ButtonGlow

    interface ButtonGlow {
        clear: (this: void) => void;
        setAlpha: (this: void, alpha: number | HiddenAlpha | undefined) => void;
        show: (this: void, spellIds: number[], color: Rgb) => void;
    }
    Index
    clear: (this: void) => void
    setAlpha: (this: void, alpha: number | HiddenAlpha | undefined) => void

    The opacity of the glowing buttons: a curve result the client computed from a hidden value (see ValueCurvesService), or a number; undefined is the glow's own opacity again.

    show: (this: void, spellIds: number[], color: Rgb) => void

    Glows the buttons of these spells in the color; an empty list clears.