import { PromptModuleAPI } from "../promptModuleAPI";

/**
 * 
 * 当使用 Babel(useTsWithBabel: true) 时，该插件将会输出 ES2015 并将其它基于浏览器目标的自动的 polyfill 委托给 Babel。
 * 仅在 production 模式下
 */
export default function(cli: PromptModuleAPI): void {
  cli.injectFeature({
    name: "TypeScript",
    value: "ts",
    short: "TS",
    description: "Add support for the TypeScript language",
    plugins: ["typescript"],
    link: "http://www.typescriptlang.org",
  });

  // selected ts and not selected babel will asked this question
  // this question's answer is default true
  // both selected ts and babel this question will not asked and also the config `useTsWithBabel` is true
  cli.injectPrompt({
    name: "useTsWithBabel",
    when: (answers) => {
      return answers.features.includes("ts") && !answers.features.includes("babel");
    },
    type: "confirm",
    message:
      "Use Babel alongside TypeScript (auto-detected polyfills)?",
    // description:
    //   "It will output ES2015 and delegate the rest to Babel for auto polyfill based on browser targets.",
    default: true,
  });

  cli.onPromptComplete((answers, options) => {
    if (!options.plugins) {
        return;
    }
    if (answers.features.includes("ts")) {
      options.plugins["cli-plugin-typescript"] = { useTsWithBabel: answers.useTsWithBabel || false };
    }
  });
};