pi extension to fix mistral

fetch-request-fix.ts

import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";

const PATCH_APPLIED = Symbol.for("amol.pi.fetch-request-fix");

export default function (_pi: ExtensionAPI) {
  const state = globalThis as typeof globalThis & { [PATCH_APPLIED]?: boolean };
  if (state[PATCH_APPLIED]) return;

  const originalFetch: typeof fetch = globalThis.fetch.bind(globalThis);

  globalThis.fetch = (input: RequestInfo | URL, init?: RequestInit) => {
    if (typeof Request !== "undefined" && input instanceof Request) {
      const requestInit: RequestInit & { duplex?: "half" } = {
        method: input.method,
        headers: input.headers,
        body: input.body,
        signal: input.signal,
        ...init,
      };

      if (input.body !== null && !requestInit.duplex) requestInit.duplex = "half";
      return originalFetch(input.url, requestInit);
    }

    return originalFetch(input, init);
  };

  state[PATCH_APPLIED] = true;
}