/**
 * Takes two branches and if the branch on the right can be fast forwarded
 * from the one on the left, return true.
 *
 * Returns true if `rightBranch` is strictly ahead of `leftBranch`.
 */
export declare function canFastForwardToRight(leftBranch: string, rightBranch: string): boolean;
/**
 * Returns true if `aBranch` is strictly ahead of `bBranch`.
 *
 * This means that there aren't any commits in `bBranch`
 */
export declare function isGitFastForward(): void;