interface SparseMatrixData {
    _size: number[];
    _values?: unknown[];
    _index: number[];
    _ptr: number[];
}
/**
 * Computes the elimination tree of Matrix A (using triu(A)) or the
 * elimination tree of A'A without forming A'A.
 *
 * @param {Matrix}  a               The A Matrix
 * @param {boolean} ata             A value of true the function computes the etree of A'A
 */
export declare function csEtree(a: SparseMatrixData | null, ata: boolean): number[] | null;
export {};
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