/**
 * The demo's dev-server step.
 *
 * Lives apart from `demo.ts` so the address the demo shows and opens can be
 * tested without booting a dev server, a browser, or stdin.
 *
 * @module cli/commands/demo/dev-step
 */
import type { DevCommandResult } from "../dev/index.js";
export interface DemoDevStepDeps {
    /** Starts the dev server. */
    start: () => Promise<DevCommandResult>;
    /** Opens the demo's browser at the given URL. */
    open: (url: string) => Promise<unknown>;
    /** Resolves when the viewer asks for the dev server to stop. */
    waitForStop: () => Promise<unknown>;
    /** Writes one line of demo output. */
    log: (line: string) => void;
}
/**
 * Shows the running dev server, opens it, then stops it on request.
 *
 * Both the printed URL and the opened URL come from `result.port` - the port
 * the server actually bound. `veryfront dev` asks for 3000 but falls forward
 * when that is taken, so keying off the requested port would send the viewer to
 * whatever process caused the collision instead of to the demo.
 */
export declare function runDemoDevStep(deps: DemoDevStepDeps): Promise<void>;
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