isMiniError()

isMiniError() is a type guard for errors created by error(). It accepts any value and returns true only for a MiniHttpError.

Bun Error Handlers

Use the guard in Bun's error callback to distinguish an expected MiniFW HTTP failure from an unexpected exception. After it returns true, TypeScript knows the value has status and message properties:

import { mini } from "@calvinbonner/minifw/core";
import { isMiniError } from "@calvinbonner/minifw/helpers";

mini({
  error(caught) {
    if (isMiniError(caught)) {
      return new Response(caught.message, { status: caught.status });
    }

    console.error(caught);
    return new Response("Internal Server Error", { status: 500 });
  },
});

What It Recognizes

The guard returns false for ordinary Error instances, strings, and any other value. MiniFW does not intercept those errors; they reach the same Bun handler. isMiniError() does not validate arbitrary objects with matching properties, because it specifically identifies MiniFW's MiniHttpError class.

Use error() to create an expected 4xx or 5xx error inside a page() or partial(). Use isMiniRedirect() only for custom handling of render-time redirects.