/**
 * An HTTP request/response body that represents serialized parameters,
 * per the MIME type `application/x-www-form-urlencoded`.
 *
 * @public
 */
export declare class HttpParams {
    private readonly _map;
    constructor(init?: HttpParams | Array<Array<string>> | Record<string, string>);
    static isHttpParams(value: unknown): value is HttpParams;
    /**
     * Appends a new value to existing values for a parameter.
     *
     * @param param - The parameter name.
     * @param value - The new value to add.
     * @returns A new body with the appended value.
     */
    append(param: string, value: string): HttpParams;
    /**
     * Removes a given value or all values from a parameter.
     *
     * @param param - The parameter name.
     * @param value - The value to remove, if provided.
     * @returns A new body with the given value removed, or with all values removed if no value is specified.
     */
    delete(param: string, value?: string): HttpParams;
    /**
     * Retrieves the first value for a parameter.
     *
     * @param param - The parameter name.
     * @returns The first value of the given parameter, or `null` if the parameter is not present.
     */
    get(param: string): string | null;
    /**
     * Reports whether the body includes one or more values for a given parameter.
     *
     * @param param - The parameter name.
     * @returns True if the parameter has one or more values, false if it has no value or is not present.
     */
    has(param: string): boolean;
    /**
     * Replaces the value for a parameter.
     *
     * @param param - The parameter name.
     * @param value - The new value.
     * @returns A new body with the new value.
     */
    set(param: string, value: string): HttpParams;
    /**
     * Retrieves all values for a  parameter.
     *
     * @param param - The parameter name.
     * @returns All values in a string array,
     * or `null` if the parameter not present.
     */
    getAll(param: string): Array<string> | null;
    /**
     * Retrieves all the parameters for this body.
     *
     * @returns The parameter names in a string array.
     */
    keys(): Array<string>;
}
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