import type { Plugin } from 'vite';
/**
 * Vite dev plugin that injects the self-monitoring agent into every served HTML document,
 * mirroring what `injectAgent` does in the esbuild and Vite build paths.
 *
 * When `app.selfMonitoringAgent` is set:
 * - For non-Dynatrace apps: serves a generated `agentConfig.js` and injects it first,
 *   followed by the external agent script.
 * - For Dynatrace apps: injects only the external agent script and an `<injection-marker>`
 *   so the tenant auto-injects its agent after ours.
 *
 * Returns a no-op plugin when `app.selfMonitoringAgent` is not configured.
 */
export declare function dtSelfMonitoringVitePlugin(): Plugin;