/**
 * A real number or something parsable as a number
 */
export declare type SpaceInput = number | string;
/**
 * A function that handles numbers, numeric strings, and unit values.
 *
 * When given a number or a numeric string, it will return the grid-based
 * value as a factor of GRID_BASE, defined above.
 *
 * When given a unit value or one of the named CSS values like `auto`,
 * it will simply return the value back.
 *
 * @param  value A number, numeric string, or a unit value.
 */
export declare function space(value?: SpaceInput): string | undefined;
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