/**
 * CW text to Morse timing encoder.
 *
 * Timing follows the ITU/PARIS convention:
 * - dit = 1200 / WPM ms
 * - dah = 3 dits
 * - intra-character gap = 1 dit
 * - character gap = 3 dits
 * - word gap = 7 dits
 */
export interface CWTimingEvent {
    type: 'key-down' | 'key-up';
    /** Delay from the previous event, in milliseconds. */
    afterMs: number;
}
export interface CWKeyStateSegment {
    /** true when the key/tone is closed, false for silence/open key. */
    keyDown: boolean;
    /** Segment duration in milliseconds. */
    durationMs: number;
}
/**
 * Encodes supported CW text into a sequence of timing events.
 */
export declare function encodeTextToCWEvents(text: string, wpm: number): CWTimingEvent[];
/**
 * Encodes supported CW text into key-down/silence duration segments.
 * This is the shared adapter input for browser sidetone and other local keying outputs.
 */
export declare function encodeTextToCWKeyStateSegments(text: string, wpm: number): CWKeyStateSegment[];
/**
 * Estimates total CW message duration from the first key-down to the final key-up.
 * Uses the PARIS timing base from Hamlib: dot milliseconds = 1200 / WPM.
 */
export declare function estimateCWMessageDurationMs(text: string, wpm: number): number;
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