masto-fe-archos/app/javascript/mastodon/components/router.tsx

import  { type PropsWithChildren } from "react";
import React from "react";

import { createBrowserHistory } from "history";
import { Router as OriginalRouter } from "react-router";

import { layoutFromWindow } from "mastodon/is_mobile";

interface MastodonLocationState {
  fromMastodon?: boolean,
  mastodonModalKey?: string,
}

const browserHistory = createBrowserHistory<
  MastodonLocationState | undefined
>();
const originalPush = browserHistory.push.bind(browserHistory);
const originalReplace = browserHistory.replace.bind(browserHistory);

browserHistory.push = (path: string, state?: MastodonLocationState) => {
  state = state ?? {};
  state.fromMastodon = true;

  if (layoutFromWindow() === "multi-column" && !path.startsWith("/deck")) {
    originalPush(`/deck${path}`, state);
  } else {
    originalPush(path, state);
  }
};

browserHistory.replace = (path: string, state?: MastodonLocationState) => {
  if (browserHistory.location.state?.fromMastodon) {
    state = state ?? {};
    state.fromMastodon = true;
  }

  if (layoutFromWindow() === "multi-column" && !path.startsWith("/deck")) {
    originalReplace(`/deck${path}`, state);
  } else {
    originalReplace(path, state);
  }
};

export const Router: React.FC<PropsWithChildren> = ({ children }) => {
  return <OriginalRouter history={browserHistory}>{children}</OriginalRouter>;
};