/**
 * Compare semver-style strings
 *
 * Ported from [condition.compareVersion@d138b50](https://github.com/optimizely/optimizely/blob/d138b50/src/www/js/client/condition.js#L209)
 *
 * @module
 */
/**
 * Compare an actual version against a targetedVersion; return -1 if the actual version is "semantically less"
 * than the targetedVersion, 1 if it is "semantically greater", and 0 if they are "semantically identical"
 * (similar to Array.prototype.sort compareFns).
 *
 * "Semantically" means the following: given both version numbers expressed in x.y.z... format, to the level of
 * precision of the targetedVersion, compare the corresponding version parts (e.g. major to major, minor to minor).
 *
 * @private
 * @param {string} version expressed as a string x.y.z...
 * @param {string} targetedVersion expressed as a string x.y.z...
 * @returns {number} -1 if version < targetedVersion, 1 if version > targetedVersion, 0 if they are approx. equal
 */
export declare function compareVersion(version: string | undefined, targetedVersion: string): number;