import type { Adapter } from "../adapters/index.js";
import type { ImageFormat } from "../image/index.js";
import type { NixKitIntegration } from "../integrations/index.js";
export type NixOutputMode = "static" | "server" | "hybrid";
export type TrailingSlashMode = "always" | "never" | "ignore";
export interface NixConfig {
    root?: string;
    appDir?: string;
    islandsDir?: string;
    contentDir?: string;
    publicDir?: string;
    outDir?: string;
    site?: string;
    base?: string;
    trailingSlash?: TrailingSlashMode;
    output?: NixOutputMode;
    adapter?: Adapter;
    images?: {
        formats?: ImageFormat[];
        quality?: number;
        strict?: boolean;
    };
    cache?: {
        dir?: string;
        defaultRevalidate?: number;
    };
    security?: {
        allowedOrigins?: string[];
        strictOrigin?: boolean;
        bodyLimit?: number;
        /** Security response headers. Set to `false` to disable defaults. */
        headers?: SecurityHeadersConfig | false;
    };
    router?: {
        enabled?: boolean;
        prefetch?: boolean;
    };
    integrations?: NixKitIntegration[];
}
/** Security headers configuration (runtime-security §14). */
export interface SecurityHeadersConfig {
    /** X-Content-Type-Options: nosniff. Default: true. */
    noSniff?: boolean;
    /** Referrer-Policy. Default: "strict-origin-when-cross-origin". */
    referrerPolicy?: string;
    /**
     * Content-Security-Policy. Set to a string to enable.
     * Use "nonce" placeholder to inject per-request nonces.
     */
    contentSecurityPolicy?: string;
    /** Strict-Transport-Security. Only applied under HTTPS. Default: unset. */
    hsts?: string | true;
    /** X-Frame-Options or CSP frame-ancestors. Default: "SAMEORIGIN". */
    frameAncestors?: string;
    /** Permissions-Policy. Default: unset. */
    permissionsPolicy?: string;
}
export interface ResolvedNixConfig {
    root: string;
    appDir: string;
    islandsDir: string;
    contentDir: string;
    publicDir: string;
    outDir: string;
    site?: string;
    base: string;
    trailingSlash: TrailingSlashMode;
    output: NixOutputMode;
    adapter?: Adapter;
    images: {
        formats: ImageFormat[];
        quality: number;
        strict: boolean;
    };
    cache: {
        dir: string;
        defaultRevalidate?: number;
    };
    security: {
        allowedOrigins: string[];
        strictOrigin: boolean;
        bodyLimit: number;
        headers: SecurityHeadersConfig | false;
    };
    router: {
        enabled: boolean;
        prefetch: boolean;
    };
    integrations: NixKitIntegration[];
    configFile?: string;
}
export interface LoadNixConfigOptions {
    root?: string;
    configFile?: string;
    command?: "dev" | "build" | "preview" | "start" | "check" | "routes" | "doctor";
    mode?: string;
    overrides?: NixConfig;
}
export declare function defineConfig(config: NixConfig): NixConfig;
export declare function loadNixConfig(options?: LoadNixConfigOptions): Promise<ResolvedNixConfig>;