import { type Matrix3x3, type Vec2, type Vec3 } from '../math';
import { SvelteSet } from 'svelte/reactivity';
import type { BornChargeData, Complex, FrequencyUnit, PhononMode, PhononModeData, PhononQPointModes, SpectrumKind, VibrationalMode, VibrationalSpectrum } from './types';
export type SpectrumCurve = {
    x: number[];
    y: number[];
};
export declare function ir_intensity(eigenvector: Complex[][], masses: number[], born_charges: Matrix3x3[]): number;
export declare function raman_invariants(tensor: Matrix3x3): {
    isotropic: number;
    anisotropy_sq: number;
    activity: number;
    depolarization_ratio: number;
};
export interface IrRamanOptions {
    raman_tensors?: Matrix3x3[] | null;
    raman_activities?: number[] | null;
    acoustic_threshold?: number;
}
export declare function acoustic_mode_indices(modes: PhononMode[], q_position: Vec3, threshold?: number): SvelteSet<number>;
export declare function compute_ir_raman_spectrum(qpoint: PhononQPointModes, masses: number[], born: BornChargeData, options?: IrRamanOptions): VibrationalSpectrum;
export declare function spectrum_from_phonon_data(data: PhononModeData, born: BornChargeData, options?: IrRamanOptions & {
    qpoint_index?: number;
}): VibrationalSpectrum;
export declare function spectrum_sticks(spectrum: VibrationalSpectrum, kind?: SpectrumKind, options?: {
    unit?: FrequencyUnit;
    include_acoustic?: boolean;
    include_imaginary?: boolean;
}): SpectrumCurve & {
    modes: VibrationalMode[];
};
export interface BroadenOptions {
    fwhm?: number;
    fwhm_fn?: (peak_center: number) => number;
    shape_factor?: number;
    range?: Vec2;
    step_size?: number;
}
export declare function broaden_spectrum(sticks: SpectrumCurve, options?: BroadenOptions): SpectrumCurve;
export declare function scale_to_max(values: number[]): number[];
export declare const to_transmittance: (absorbance: number[]) => number[];