import type { UserContext } from '@redocly/openapi-core';
export type ExtensionAccumulator = {
    count: number;
    props: Record<string, Set<string>>;
};
export type ExtensionsAccumulator = Record<string, ExtensionAccumulator>;
export type CollectedExtension = {
    count: number;
    props: Record<string, string>;
};
export declare function createExtensionsVisitor(accumulator: ExtensionsAccumulator): {
    any: {
        enter(node: unknown): void;
    };
    SpecExtension: {
        enter(value: unknown, ctx: UserContext): void;
    };
    XCodeSampleList: {
        enter(value: unknown, ctx: UserContext): void;
    };
    ExamplesMap: {
        enter(value: unknown, ctx: UserContext): void;
    };
    EnumDescriptions: {
        enter(value: unknown, ctx: UserContext): void;
    };
    TagGroups: {
        enter(value: unknown, ctx: UserContext): void;
    };
    Logo: {
        enter(value: unknown, ctx: UserContext): void;
    };
    XServerList: {
        enter(value: unknown, ctx: UserContext): void;
    };
    XUsePkce: {
        enter(value: unknown, ctx: UserContext): void;
    };
    WebhooksMap: {
        enter(value: unknown, ctx: UserContext): void;
    };
};
export declare function toCollectedExtensions(accumulator: ExtensionsAccumulator): Record<string, CollectedExtension> | undefined;
//# sourceMappingURL=extension-sampling.d.ts.map