import type { FixedNumberExpression, RGBAColorValue, ColorExpression, NumberExpression, GradientColor, FixedVec3Expression, vec2, vec3, vec4, BezierKeyframeValue } from '@galacean/effects-specification';
import { ParticleOrigin } from '@galacean/effects-specification';
export declare function arrAdd<T>(arr: T[], item: T): boolean | undefined;
export declare function ensureFixedNumber(a: any): FixedNumberExpression | undefined;
export declare function ensureFixedNumberWithRandom(a: any, p: number): FixedNumberExpression | undefined;
export declare function ensureRGBAValue(a: any): RGBAColorValue;
export declare function ensureColorExpression(a: any, normalized?: boolean): ColorExpression | undefined;
export declare function ensureNumberExpression(a: any): NumberExpression | undefined;
export declare function ensureValueGetter(a: any): any;
export declare function ensureGradient(a: any, normalized?: boolean): GradientColor | undefined;
export declare function colorToArr(hex: string | number[], normalized?: boolean): vec4;
export declare function normalizeColor(a: number[]): number[] | undefined;
export declare function parsePercent(c: string): number;
export declare function getGradientColor(color: string | Array<string | number[]> | GradientColor, normalized?: boolean): GradientColor | undefined;
export declare function ensureFixedVec3(a: any): FixedVec3Expression | undefined;
export declare function objectValueToNumber(o: Record<string, any>): object;
export declare function deleteEmptyValue(o: Record<string, any>): object;
export declare function quatFromXYZRotation(out: vec4 | number[], x: number, y: number, z: number): vec4;
export declare function rotationZYXFromQuat(out: vec3 | number[], quat: vec4): vec3;
/**
 * 提取并转换 JSON 数据中的 anchor 值
 */
export declare function convertAnchor(anchor?: vec2, particleOrigin?: ParticleOrigin): vec2;
export declare const particleOriginTranslateMap: Record<number, vec2>;
export declare function getBezierCurveFromHermiteInGE(geHermiteCurves: number[][]): BezierKeyframeValue[];