@chatie/semver/src/semver.ts

The Enhanced Semantic Versioner for NPM

/**
 * Author: Huan LI <zixia@zixia.net>
 * https://github.com/huan
 * License: Apache-2.0
 */
import {
  SemVer as SemVerBase,
  // eslint-disable-next-line no-unused-vars
  Options as SemVerOptions,
  minor,
  prerelease,
}                           from 'semver'

export function prod (version: string | SemVer): boolean {
  if (typeof version === 'string') {
    version = new SemVer(version)
  }
  return version.isProd
}

export function dev (version: string): boolean {
  return !prod(version)
}

export class SemVer extends SemVerBase {

  public isProd:  boolean
  public isDev:   boolean

  constructor (
    version        : string | SemVer,
    optionsOrLoose?: boolean | SemVerOptions,
  ) {
    super(version, optionsOrLoose)

    const minorVersion = minor(version)
    const prereleaseVersion = prerelease(version)

    if (prereleaseVersion && prereleaseVersion.length > 0) {
      this.isProd = false // pre-release version
    } else {
      this.isProd = minorVersion % 2 === 0 // production release
    }

    this.isDev = !this.isProd
  }

}