declare module 'extra-version' {
/**
 * Given a version number MAJOR.MINOR.PATCH, increment the:
 * [more](https://github.com/nodef/extra-version/wiki/Version)
 *
 * 1. MAJOR version when you make incompatible API changes,
 * 2. MINOR version when you add functionality in a backwards compatible manner
 * 3. PATCH version when you make backwards compatible bug fixes.
 *
 * Additional labels for pre-release and build metadata are available as
 * extensions to the MAJOR.MINOR.PATCH format.
 *
 * A normal version number MUST take the form X.Y.Z where X, Y, and Z are
 * non-negative integers, and MUST NOT contain leading zeroes. X is the
 * major version, Y is the minor version, and Z is the patch version. Each
 * element MUST increase numerically. For instance: 1.9.0 -> 1.10.0 -> 1.11.0.
 *
 * Software using Semantic Versioning MUST declare a public API. This API
 * could be declared in the code itself or exist strictly in documentation.
 * However it is done, it SHOULD be precise and comprehensive.
 *
 * Once a versioned package has been released, the contents of that version
 * MUST NOT be modified. Any modifications MUST be released as a new version.
 *
 * Major version zero (0.y.z) is for initial development. Anything MAY change
 * at any time. The public API SHOULD NOT be considered stable.
 *
 * Version 1.0.0 defines the public API. The way in which the version number
 * is incremented after this release is dependent on this public API and how
 * it changes.
 * @see https://semver.org
 */
export class Version {
	/**
	 * Major is updated on incompatible changes.
	 * @example '1'.0.0, '1'.2.3-alpha.1
	 */
	major: number;
	/**
	 * Minor is updated on adding compatible functionality.
	 * Minor is reset to 0 when major is updated.
	 * @example 1.'0'.0, 1.'2'.3-alpha.1
	 */
	minor: number;
	/**
	 * Patch is updated on making compatible bug fixes.
	 * Patch is reset to 0 when major or minor is updated.
	 * @example 1.0.'0', 1.2.'3'-alpha.1
	 */
	patch: number;
	/**
	 * Pre-release indicates an unstable version, possibly incompatible.
	 * Pre-releases are considered lower with respect to normal versions.
	 * It consists of alphanumeric or hyphen, separated by dot.
	 * @example 1.0.0-'alpha', 1.2.3-'alpha.1'
	 */
	prerelease: string[];
	/**
	 * Build metadata provides additonal build information.
	 * Build metadata is non-unique and does not alter version ordering.
	 * It consists of alphanumeric or hyphen, separated by dot.
	 * @example 1.0.0-alpha+'20130313', 1.2.3-beta+'sha.5114f85'.
	 */
	buildmetadata: string[];
	/**
	 * Defines a semantic version.
	 * @param major major number (0)
	 * @param minor minor number (0)
	 * @param patch patch number (0)
	 * @param prerelease pre-release (null)
	 * @param buildmetadata build metadata (null)
	 */
	constructor(major?: number, minor?: number, patch?: number, prerelease?: string[], buildmetadata?: string[]);
	/**
	 * Converts version to string.
	 */
	toString(): string;
}
export type compareFn<T> = (a: T, b: T) => number;
export type mapFn<T, U> = (v: T, i: number, x: Iterable<T>) => U;
export type nextFn<T> = (v: T, d: T) => T;
/**
 * Compares two versions.
 * [more](https://github.com/nodef/extra-version/wiki/compare)
 *
 * Pre-releases are considered lower with respect to normal versions.
 * Build metadata is non-unique and does not alter version ordering.
 * @param x a version
 * @param y another version
 * @param fc compare function (a, b)
 * @param fm map function (v, i, x)
 * @returns x<y: -ve, x=y: 0, x>y: +ve
 */
export function compare(x: Version, y: Version, fc?: compareFn<string>, fm?: mapFn<string, string>): number;
/**
 * Converts value to version.
 * [more](https://github.com/nodef/extra-version/wiki/from)
 * @param v a value
 * @returns version, or null
 */
export function from(v: any): Version;
/**
 * Checks if value is version.
 * [more](https://github.com/nodef/extra-version/wiki/is)
 * @param v value
 */
export function is(v: any): boolean;
/**
 * Checks if two versions are equal.
 * [more](https://github.com/nodef/extra-version/wiki/isEqual)
 *
 * Pre-releases are considered lower with respect to normal versions.
 * Build metadata is non-unique and does not alter version ordering.
 * @param x an version
 * @param y another version
 * @param fc compare function (a, b)
 * @param fm map function (v, i, x)
 */
export function isEqual(x: Version, y: Version, fc?: compareFn<string>, fm?: mapFn<string, string>): boolean;
/**
 * Checks if version is major 0, or pre-release.
 * [more](https://github.com/nodef/extra-version/wiki/isUnstable)
 * @param x a version
 */
export function isUnstable(x: Version): boolean;
/**
 * Defines first major version. (1.0.0)
 * [more](https://github.com/nodef/extra-version/wiki/MAJOR)
 * Can be used as next major step.
 */
export const MAJOR: Version;
/**
 * Defines first minor version. (0.1.0)
 * [more](https://github.com/nodef/extra-version/wiki/MINOR)
 * Can be used as next minor step.
 */
export const MINOR: Version;
/**
 * Gives the next version.
 * [more](https://github.com/nodef/extra-version/wiki/next)
 *
 * Version step is for updating major, minor, patch, prerelease, or buildmetadata.
 * Next function is for controlling now each part of version is updated with step.
 * If a version part "xv" is to be reset, step part "sv" begins with '.'.
 * @param x a version
 * @param s version step (0.0.1)
 * @param fn next function (xv, sv)
 */
export function next(x: Version, s?: Version, fn?: nextFn<string>): Version;
/**
 * Converts string to version.
 * [more](https://github.com/nodef/extra-version/wiki/parse)
 * @param s a string
 * @param i start index (0)
 * @param lvl permissive level, 0-4/-1 (0 => none)
 * @returns [end index, version], or [-1, null]
 */
export function parse(s: string, i?: number, lvl?: number): [
	number,
	Version
];
/**
 * Defines first patch version. (0.0.1)
 * [more](https://github.com/nodef/extra-version/wiki/PATCH)
 * Can be used as next patch step.
 */
export const PATCH: Version;
/**
 * Regular expression to check a semver string.
 * [more](https://github.com/nodef/extra-version/wiki/RVERSION)
 * @see https://regex101.com/r/vkijKf/1/
 */
export const RVERSION: RegExp;
/**
 * Converts version to string.
 * [more](https://github.com/nodef/extra-version/wiki/stringify)
 * @param x a version
 */
export function stringify(x: any): string;

export {};
}