/**
 * Compute equal column widths (px) that fill the available page content width.
 * Returns null when page dimensions are unavailable.
 *
 * @param {import('@core/Editor').Editor} editor
 * @param {number} columnCount
 * @returns {number[] | null}
 */
export function computeColumnWidths(editor: import('../../../core/Editor.js').Editor, columnCount: number): number[] | null;
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