Method exec

deps/npm/lib/npm.js:189–201

(cmd, args = this.argv)

  }

  async exec (cmd, args = this.argv) {
    if (!this.#command) {
      let err
      try {
        await this.#exec(cmd, args)
      } catch (e) {
        err = e
      }
      return this.#handleError(err)
    } else {
      return this.#exec(cmd, args)
    }
  }

  // Call an npm command
  async #exec (cmd, args) {