export declare function devCommand(options: {
    port?: number;
    open?: boolean;
    clientRoot: string;
    /** Stop 10 seconds after the last browser disconnects, unless one reconnects. */
    exitWhenIdle?: boolean;
    /** Client-owned rewrite of the HTML shell (see DevServerOptions). */
    transformClientHtml?: (html: string) => string;
    /** Exit with code 75 after a reusable-source change so an outer supervisor can relaunch. */
    supervisedRuntime?: boolean;
    /**
     * Parsed `--toolchain.*` options, exactly as commander produced them.
     *
     * The server takes the same overrides the CLI does, so a session started
     * with `--toolchain.validator=syside` draws from the same selection
     * `memo validate --toolchain.validator=syside` reports on. A capability
     * that exists only in one of them is a defect.
     */
    toolchainOptions?: Record<string, unknown>;
}): Promise<void>;
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