/**
 * Census SDK — typed API client for the U.S. Census Bureau Data API.
 *
 * Standalone — no MCP server required. Usage:
 *
 *   import { queryCensus, searchVariables } from "us-gov-open-data-mcp/sdk/census";
 *
 *   const data = await queryCensus("2023/acs/acs1", "NAME,B01001_001E", "state:*");
 *   console.log(data.headers, data.rows);
 *
 * Requires CENSUS_API_KEY env var. Get one at https://api.census.gov/data/key_signup.html
 */
/** Transformed Census query result: first row becomes headers, rest becomes rows. */
export interface CensusQueryResult {
    headers: string[];
    rows: string[][];
}
/** Census Variable. */
export interface CensusVariable {
    label?: string;
    concept?: string;
    predicateType?: string;
}
/** Census Variable Match. */
export interface CensusVariableMatch {
    id: string;
    label: string;
    concept: string;
}
/** Census Dataset. */
export interface CensusDataset {
    path: string;
    name: string;
    description: string;
}
/** Commonly used Census API variable codes. */
export declare const commonVariables: {
    readonly NAME: "Geographic area name";
    readonly B01001_001E: "Total population";
    readonly B01002_001E: "Median age";
    readonly B02001_002E: "White alone population";
    readonly B02001_003E: "Black/African American alone";
    readonly B03003_003E: "Hispanic/Latino population";
    readonly B19013_001E: "Median household income";
    readonly B19001_001E: "Household income distribution (total)";
    readonly B19301_001E: "Per capita income";
    readonly B25077_001E: "Median home value (owner-occupied)";
    readonly B25064_001E: "Median gross rent";
    readonly B25003_001E: "Housing tenure (total occupied)";
    readonly B25003_002E: "Owner-occupied housing units";
    readonly B25003_003E: "Renter-occupied housing units";
    readonly B17001_002E: "Population below poverty level";
    readonly B15003_022E: "Bachelor's degree";
    readonly B15003_023E: "Master's degree";
    readonly B15003_025E: "Doctorate degree";
    readonly B23025_002E: "In labor force";
    readonly B23025_005E: "Unemployed";
};
/** Datasets. */
export declare const datasets: CensusDataset[];
/**
 * Query the Census Bureau Data API.
 * The raw API returns a 2D string array; this transforms it into { headers, rows }.
 */
export declare function queryCensus(dataset: string, variables: string, forGeo: string, inGeo?: string, extra?: Record<string, string>): Promise<CensusQueryResult>;
/**
 * Search for Census variable names/codes by keyword within a dataset.
 * Fetches the dataset's variables.json and filters locally.
 */
export declare function searchVariables(dataset: string, keyword: string, maxResults?: number): Promise<CensusVariableMatch[]>;
/** Clear cached responses. */
export declare function clearCache(): void;
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