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import * as _ from 'lodash';
import semverSort = require('semver-sort');
// Regex that matches semantic versions only including digits and dots.
const SEM_VER_REGEX = /^(\d+\.){1}(\d+\.){1}(\d+){1}$/gm;
export const semverUtils = {
/**
* Checks whether version a is lessThan version b. Supplied versions must be
* Semantic Versions containing only numbers and dots (e.g 1.4.0).
* @param a version of interest
* @param b version to compare a against
* @return Whether version a is lessThan version b
*/
lessThan(a: string, b: string): boolean {
this.assertValidSemVer('a', a);
this.assertValidSemVer('b', b);
if (a === b) {
return false;
}
const sortedVersions = semverSort.desc([a, b]);
const isALessThanB = sortedVersions[0] === b;
return isALessThanB;
},
/**
* Checks whether version a is greaterThan version b. Supplied versions must be
* Semantic Versions containing only numbers and dots (e.g 1.4.0).
* @param a version of interest
* @param b version to compare a against
* @return Whether version a is greaterThan version b
*/
greaterThan(a: string, b: string): boolean {
this.assertValidSemVer('a', a);
this.assertValidSemVer('b', b);
if (a === b) {
return false;
}
const sortedVersions = semverSort.desc([a, b]);
const isAGreaterThanB = sortedVersions[0] === a;
return isAGreaterThanB;
},
assertValidSemVer(variableName: string, version: string): void {
if (!version.match(SEM_VER_REGEX)) {
throw new Error(
`SemVer versions should only contain numbers and dots. Encountered: ${variableName} = ${version}`,
);
}
},
getLatestVersion(versions: string[]): string {
_.each(versions, version => {
this.assertValidSemVer('version', version);
});
const sortedVersions = semverSort.desc(versions);
return sortedVersions[0];
},
};
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