/**
 * WASM dispatch bridge for spectral signal kernels — Slice 5.6.
 *
 * Kernels covered:
 *   - `apply_window_f64`       — in-place window multiplication
 *   - `welch_psd_f64`          — Welch's overlapped-segment-averaging PSD
 *   - `bartlett_psd_f64`       — Bartlett's non-overlapped segment-averaging PSD
 *   - `goertzel_f64`           — Goertzel single-bin DFT (returns |X[k]|²)
 *   - `chirp_z_transform_f64`  — Bluestein chirp-Z transform
 *
 * Dispatch (for arrays ≥ WASM_SIGNAL_THRESHOLD = 4096 samples):
 *   1. AS managed kernel (the binary the functions package bundles).
 *   2. Fall back to pure-JS implementation.
 *
 * The legacy native-pointer path was removed from this bridge in the
 * migration Phase 5 functions cutover.
 *
 * Window-type encoding:
 *   0 = Hann, 1 = Hamming, 2 = Blackman, 3 = Rectangular (no-op)
 *
 * Any thrown error is swallowed and the JS fallback runs — the WASM tier
 * is an optimisation, not a correctness requirement.
 */
/** Minimum sample count for WASM acceleration. */
export declare const WASM_SIGNAL_THRESHOLD = 4096;
/** JS fallback: apply a window to `samples` in-place. */
export declare function applyWindowJS(samples: Float64Array, windowType: number): void;
/** JS fallback: Goertzel algorithm, returns |X[k]|² at `targetFreq`. */
export declare function goertzelJS(samples: Float64Array, targetFreq: number, sampleRate: number): number;
/** JS fallback: Welch's PSD. */
export declare function welchPSDJS(samples: Float64Array, frameLength: number, overlap: number, windowType: number): Float64Array;
/** JS fallback: Bartlett's PSD (Welch with rectangular window, overlap=0). */
export declare function bartlettPSDJS(samples: Float64Array, frameLength: number): Float64Array;
/** JS fallback: Chirp-Z Transform (Bluestein). */
export declare function chirpZTransformJS(samples: Float64Array, m: number, phiStartRe: number, phiStartIm: number, phiStepRe: number, phiStepIm: number): {
    re: Float64Array;
    im: Float64Array;
};
/**
 * Apply a window function to `samples` in-place.
 * Always runs (no threshold — small arrays benefit too).
 */
export declare function applyWindowDispatch(samples: Float64Array, windowName: string): void;
/**
 * Welch's PSD with WASM acceleration above threshold.
 */
export declare function welchPSDDispatch(samples: Float64Array, frameLength: number, overlap: number, windowName: string): Float64Array;
/**
 * Bartlett's PSD with WASM acceleration above threshold.
 */
export declare function bartlettPSDDispatch(samples: Float64Array, frameLength: number): Float64Array;
/**
 * Goertzel single-bin DFT with WASM acceleration above threshold.
 */
export declare function goertzelDispatch(samples: Float64Array, targetFreq: number, sampleRate: number): number;
/**
 * Chirp-Z Transform with WASM acceleration above threshold.
 */
export declare function chirpZTransformDispatch(samples: Float64Array, m: number, phiStartRe: number, phiStartIm: number, phiStepRe: number, phiStepIm: number): {
    re: Float64Array;
    im: Float64Array;
};
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