/**
 * Dev-only error overlay. When a loader/action/render throws during `@nifrajs/web/vite` dev, this
 * renders a readable full-page overlay from a structured [Diagnostic] - the code, the message, a source
 * codeframe around the offending line, the recognised cause/fix when nifra has one, and the stack -
 * instead of a bare `err.stack` text dump. Dev-only by construction: it's called solely from the dev
 * server's catch, never in production (production maps errors to the `_error` route boundary).
 *
 * The overlay and the agent surfaces (`/__nifra/last-error`, `nifra_explain`) render from the SAME
 * `Diagnostic`, so a person and an agent see the identical failure, one as HTML and one as JSON.
 */
import type { Diagnostic } from "./diagnostic.js";
/** Render the overlay HTML from a prebuilt Diagnostic (the same object the agent surfaces serve). */
export declare function renderDiagnosticOverlay(diagnostic: Diagnostic): string;
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