publish-action/src/version-utils.ts

import semverParse from 'semver/functions/parse';
import SemVer from 'semver/classes/semver';

export function isStableSemverVersion(version: SemVer): boolean {
  return version.prerelease.length === 0;
}

export function getMajorTagFromFullTag(fullTag: string): string {
  return fullTag.split('.')[0];
}

export function validateSemverVersionFromTag(tag: string): void {
  const semverVersion = semverParse(tag);
  if (!semverVersion) {
    throw new Error(
      `The '${tag}' doesn't satisfy semantic versioning specification`
    );
  }

  if (!isStableSemverVersion(semverVersion)) {
    throw new Error(
      'It is not allowed to specify pre-release version to update the major tag'
    );
  }
}