x4js - v2.2.49
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    interface IGlyphMarginLanesModel {
        requiredLanes: number;
        getLanesAtLine(lineNumber: number): GlyphMarginLane[];
        push(lane: GlyphMarginLane, range: Range, persist?: boolean): void;
        reset(maxLine: number): void;
    }
    Index
    requiredLanes: number

    The number of lanes that should be rendered in the editor.