Method convertVersionsToSpecs

deps/npm/lib/commands/diff.js:213–245

([a, b])

  }

  async convertVersionsToSpecs ([a, b]) {
    const semverA = semver.validRange(a)
    const semverB = semver.validRange(b)

    // both specs are semver versions, assume current project dir name
    if (semverA && semverB) {
      let pkgName
      try {
        const { content: pkg } = await pkgJson.normalize(this.prefix)
        pkgName = pkg.name
      } catch {
        log.verbose('diff', 'could not read project dir package.json')
      }

      if (!pkgName) {
        throw this.usageError('Needs to be run from a project dir in order to diff two versions.')
      }

      return [`${pkgName}@${a}`, `${pkgName}@${b}`]
    }

    // otherwise uses the name from the other arg to figure out the spec.name of what to compare
    if (!semverA && semverB) {
      return [a, `${npa(a).name}@${b}`]
    }

    if (semverA && !semverB) {
      return [`${npa(b).name}@${a}`, b]
    }

    // no valid semver ranges used
    return [a, b]
  }

  async findVersionsByPackageName (specs) {
    let actualTree