@jsenv/plugin-preact/src/client/preact_refresh.js

import "@prefresh/core";
import { flush } from "@prefresh/utils";

export const installPreactRefresh = (url) => {
  let prevRefreshReg = self.$RefreshReg$ || (() => {});
  let prevRefreshSig = self.$RefreshSig$ || (() => (type) => type);
  self.$RefreshReg$ = (type, id) => {
    self.__PREFRESH__.register(type, `${url} ${id}`);
  };
  self.$RefreshSig$ = () => {
    let status = "begin";
    let savedType;
    return (type, key, forceReset, getCustomHooks) => {
      if (!savedType) savedType = type;
      status = self.__PREFRESH__.sign(
        type || savedType,
        key,
        forceReset,
        getCustomHooks,
        status,
      );
      return type;
    };
  };
  return {
    end: () => {
      self.$RefreshReg$ = prevRefreshReg;
      self.$RefreshSig$ = prevRefreshSig;
    },
    acceptCallback: () => {
      flush();
    },
  };
};