/**
 * Mount element for report-cell comment popovers. Popovers must render
 * outside the react-window scroller (`.content-scroll`): react-window forces
 * inline `overflow: auto` + `will-change: transform` on it, so anything
 * rendered inside is clipped by the scrollport, trapped in its stacking
 * context (below the sticky name column), and composer growth can scroll it
 * and recycle the row — unmounting the popover mid-reply.
 */
export declare const ReportThreadPortalContext: import('react').Context<HTMLDivElement | null>;