/**
 * Returns the sum and exact error of adding two floating point numbers.
 * Uses an EFT (error-free transformation), i.e. a+b === x+y exactly.
 * The returned sum is a non-overlapping expansion (smallest value first!).
 *
 * Precondition: abs(a) >= abs(b) - A fast test that can be used is
 * (a > b) === (a > -b)
 *
 * See https://people.eecs.berkeley.edu/~jrs/papers/robustr.pdf
 */
declare function fastTwoSum(a: number, b: number): number[];
export { fastTwoSum };