licenses.ts

/**
 * @file License identifier constants. Exports common SPDX license strings (MIT,
 *   UNLICENSED) and a lazily-built set of copy-left SPDX identifiers used when
 *   classifying package licenses.
 */

import { SetCtor } from '../primordials/map-set'
// License identifiers.
export const MIT = 'MIT'
export const UNLICENCED = 'UNLICENCED'
export const UNLICENSED = 'UNLICENSED'

// Copy-left licenses.
let copyLeftLicenses: Set<string>
/**
 * Get the set of SPDX identifiers considered copy-left (AGPL, GPL, EPL, EUPL,
 * CC-BY-SA variants). The set is lazily built and cached on first call.
 *
 * @returns A `Set` of SPDX license identifier strings.
 */
export function getCopyLeftLicenses(): Set<string> {
  if (copyLeftLicenses === undefined) {
    copyLeftLicenses = new SetCtor([
      'AGPL-1.0',
      'AGPL-1.0-only',
      'AGPL-1.0-or-later',
      'AGPL-3.0',
      'AGPL-3.0-only',
      'AGPL-3.0-or-later',
      'CC-BY-SA-1.0',
      'CC-BY-SA-2.0',
      'CC-BY-SA-3.0',
      'CC-BY-SA-4.0',
      'EPL-1.0',
      'EPL-2.0',
      'EUPL-1.1',
      'EUPL-1.2',
      'GPL-1.0',
      'GPL-1.0-only',
      'GPL-1.0-or-later',
      'GPL-2.0',
      'GPL-2.0-only',
      'GPL-2.0-or-later',
      'GPL-3.0',
      'GPL-3.0-only',
      'GPL-3.0-or-later',
    ])
  }
  return copyLeftLicenses
}