import type { NextConfig } from 'next';
type NextFuncConfig = (phase: string, { defaultConfig }: {
    defaultConfig: NextConfig;
}) => NextConfig;
type NextAsyncConfig = (phase: string, { defaultConfig }: {
    defaultConfig: NextConfig;
}) => Promise<NextConfig>;
type UserProvidedConfig = NextConfig | NextFuncConfig | NextAsyncConfig;
export type PostHogNextConfig = {
    personalApiKey: string;
    envId: string;
    host?: string;
    verbose?: boolean;
    sourcemaps?: {
        enabled?: boolean;
        project?: string;
        version?: string;
        deleteAfterUpload?: boolean;
    };
};
export type PostHogNextConfigComplete = {
    personalApiKey: string;
    envId: string;
    host: string;
    verbose: boolean;
    sourcemaps: {
        enabled: boolean;
        project?: string;
        version?: string;
        deleteAfterUpload: boolean;
    };
};
export declare function withPostHogConfig(userNextConfig: UserProvidedConfig, posthogConfig: PostHogNextConfig): NextConfig;
export {};