standardnotes-app/packages/snjs/lib/Version.ts

import { eq, gt } from 'semver'

/** Declared in webpack config */
declare const __VERSION__: string
export const SnjsVersion = __VERSION__

/**
 * Legacy architecture (pre-3.5 clients)
 */
export const PreviousSnjsVersion1_0_0 = '1.0.0'

/**
 * First release of new architecture, did not automatically store version
 */
export const PreviousSnjsVersion2_0_0 = '2.0.0'

/**
 * Returns true if the version string on the right is greater than the one
 * on the left. Accepts any format version number, like 2, 2.0, 2.0.0, or even 2.0.0.01
 */
export function isRightVersionGreaterThanLeft(left: string, right: string): boolean {
  return compareSemVersions(left, right) === -1
}

/**
 *  -1 if a < b
 *  0 if a == b
 *  1 if a > b
 */
export function compareSemVersions(left: string, right: string): 1 | -1 | 0 {
  if (eq(left, right)) {
    return 0
  }

  if (gt(left, right)) {
    return 1
  }

  return -1
}