export default function loader(source: string) {
  let arr = source.match(/^(\s*).*\bclass [^<]+<(\w+)[\s\S]+?{([\s\S]+(^\s+)(@reducer\b|@effect\b)[\s\S]+)^\1}/m);
  if (arr) {
    const state = arr[2];
    const content = arr[3];
    const split = arr[4];

    let reg = new RegExp(`@reducer\\b[^)]+\\)(?!\\s*:\\s*${state}\\b)`, "m");
    arr = content.match(reg);
    if (arr) {
      throw new Error(`\n @reducer can only be decorated the function with "${state}" returned:\n${arr[0]}`);
    }
    arr = content.match(/@effect\(([^(](?!async))+?\(/m);
    if (arr) {
      throw new Error(`\n @effect can only be decorated the "async" function:\n${arr[0]}`);
    }
    reg = new RegExp(`\\n(.(?!@reducer\\b|@effect\\b))*\\n${split}(?!private|protected)\\w+.+`, "m");
    arr = content.match(reg);
    if (arr) {
      throw new Error(`\n All the public method must decorated by @reducer or @effect:\n${arr[0]}`);
    }
    /* arr = content.match(/(@reducer\b|@effect\()[^(]+(\w+)\s*\(/gm);
    if (arr) {
      reg = new RegExp(
        arr
          .map(
            str =>
              `this\\.${str
                .substring(str.lastIndexOf(" ") + 1)
                .replace(" ", "")
                .replace("(", "\\(")}`,
          )
          .join("|"),
      );
      arr = source.match(reg);
      if (arr) {
        throw new Error(`\n @reducer or @effect handler cannot be called directly, use this.callSelf instead:\n${arr[0]}`);
      }
    } */
  }
  return source;
}