typings.install() API proposal

typings.install.ts

export interface InstallOptions {
  cwd: string;
  /**
   * If not specified, will benerate both "browser.d.ts" and "main.d.ts"
   **/
  env?: "browser" | "main" | string[];
  production: boolean; // Q: Not sure if this should be part of public API
}

export interface Typings {
  install(options: InstallOptions): Promise<{ tree: DependencyTree }>;
}