import ' rollup-plugin-inject-process-env';
import { DateTime, DateTimeRange, Duration, DurationFormat, RequestSlotValues } from "./models";
export declare enum ListDelimiter {
    or = 0,
    and = 1
}
/**
 * Based on the provided slot value, it will return the appropriate <say-as> tag.
 *
 * {@link https://cloud.google.com/text-to-speech/docs/ssml#say%E2%80%91as}
 * {@link https://developer.amazon.com/en-US/docs/alexa/custom-skills/speech-synthesis-markup-language-ssml-reference.html#say-as}
 * {@link https://docs.aws.amazon.com/polly/latest/dg/supportedtags.html#say-as-tag}
 *
 * @param value
 * @returns
 */
export declare function slotValueToSpeech(value: RequestSlotValues, type?: "ssml" | "displayText"): string;
/**
 * Determine if the request slot value is a DateTime
 *
 * @public
 * @param slotValue - Slot value to check
 */
export declare function isDateTime(slotValue: RequestSlotValues): slotValue is DateTime;
/**
 * Determine if the request slot value is a DateTimeRange
 *
 * @public
 * @param slotValue - Slot value to check
 */
export declare function isDateTimeRange(slotValue: RequestSlotValues): slotValue is DateTimeRange;
/**
 * Determine if the request slot value is a Duration
 *
 * @public
 * @param slotValue - Slot value to check
 */
export declare function isDuration(slotValue: RequestSlotValues): slotValue is Duration;
/**
 * Converts a date time object to a string that can be used in either SSML or display text.
 *
 * @privateRemarks
 * We will want to consider how we tackle localization of dates.  date-fns
 * can handle it we just need to pass in the locale.  Additionally, when generating
 * a response for display, we may want to support a short and long form.
 *
 * @beta
 * @param value
 * @param type
 */
export declare function dateTimeToSpeech(value: DateTime, type?: "ssml" | "displayText"): string;
export declare function dateTimeRangeToSpeech(value: DateTimeRange, type?: "ssml" | "displayText"): string;
export declare function durationToSpeech(duration: Duration, type?: "ssml" | "displayText"): string;
/**
 * Converts a date time object to a string.
 *
 * Either a single date (2020-07-19T23:59:59) or a range (2019-07-19T00:00:00 --> 2020-07-19T23:59:59).
 *
 * @param dateTime - Either DateTime or DateTimeRange to convert to a string
 */
export declare function dateTimeToString(dateTime: DateTime | DateTimeRange): string;
export type DurationFormatToMSMultiplier = Record<DurationFormat, number>;
/**
 * Lookup table to convert a duration format to a multiplier that will convert it to milliseconds
 */
export declare const DURATION_FORMAT_TO_MS_MULTIPLIER: DurationFormatToMSMultiplier;
/**
 * Builds a speakable and readable list from a set of items.
 *
 * For example, ["one", "two", "three", "four"] will be transformed
 * to "one, two, three or four".
 *
 * @param {string[]} items
 * @param {ListisizeDelimiter} [delimiter]
 */
export declare function listisize(items: string[], preferredDelimiter?: ListDelimiter): string;