import type { FunnelSdkRuntimeConfigOverrides } from './types.js';
export declare const asTrimmedStringOrNull: (value: unknown) => string | null;
export declare const removeEmptyFields: (input: Record<string, unknown>) => Record<string, unknown>;
type ResolvedFunnelSdkRuntimeConfig = {
    apiBaseUrl: string | null;
    funnelId: string | null;
    funnelVersionId: string | null;
    funnelSdkPublishableKey: string | null;
    paymentsApiVersion: 'v2';
};
export declare const resolveRuntimeConfig: (runtimeConfig?: FunnelSdkRuntimeConfigOverrides) => ResolvedFunnelSdkRuntimeConfig;
export declare const buildApiUrl: (path: string, runtimeConfig?: FunnelSdkRuntimeConfigOverrides) => string;
export declare const buildHeaders: (runtimeConfig?: FunnelSdkRuntimeConfigOverrides, headers?: Record<string, string>) => Record<string, string>;
export declare const withRuntimeFields: (runtimeConfig?: FunnelSdkRuntimeConfigOverrides, body?: Record<string, unknown>, options?: {
    includePublishableKey?: boolean;
}) => Record<string, unknown>;
export {};