/**
 * Input functions for AWS API Gateway VTL templates ($input.*)
 * Matches the behavior of the Java implementation
 */
export declare class InputFunctions {
    private context;
    private input;
    private inputString;
    constructor(context: Record<string, any>, input?: Record<string, any>, inputString?: string);
    /**
     * $input.path(x) - Returns a JSON object representation that allows native VTL manipulation
     * This allows you to access and manipulate elements of the payload natively in VTL
     */
    path(jsonPath: string): any;
    /**
     * $input.json(x) - Evaluates a JSONPath expression and returns the results as a JSON string
     * For example, $input.json('$.pets') returns a JSON string representing the pets structure
     */
    json(jsonPath: string): string;
    /**
     * $input.body - Returns the raw request payload as a string
     * You can use $input.body to preserve entire floating point numbers, such as 10.00
     */
    body(): string;
    /**
     * Alias for body()
     */
    getBody(): string;
    /**
     * $input.params() - Returns all parameters (path, querystring, header)
     */
    params(): Record<string, any>;
    params(paramName: string): string | null;
    /**
     * $input.headers(name) - Get a specific header value
     */
    headers(headerName: string): string | null;
    /**
     * $input.size() - Returns the size of the input array or object
     */
    size(): number;
}
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