/**
 * A subset of SVGGeometryElement: anything that can report its length and sample
 * a point at a given arc distance. Real `<path>`/`<line>`/`<polyline>` elements
 * satisfy it natively; tests pass a plain object.
 */
export interface PathGeometry {
    getTotalLength(): number;
    getPointAtLength(distance: number): {
        x: number;
        y: number;
    };
}
/** A path source: a CSS selector or any geometry element/object. */
export type PathInput = string | PathGeometry;
/** A sampled point on a path: position plus the tangent direction (degrees). */
export interface PathPoint {
    x: number;
    y: number;
    /** tangent direction in degrees, fed to autoRotate */
    angle: number;
}
export interface SamplePathOptions {
    /**
     * Distance, as a fraction of total length, used to estimate the tangent angle
     * from two neighbouring samples. Smaller is sharper but noisier. Default 0.001.
     */
    tangentEpsilon?: number;
}
export interface PathSampler {
    /** Total path length, in the path's user units. */
    readonly length: number;
    /** Point at progress t (clamped to 0..1), with the tangent angle. */
    at(t: number): PathPoint;
}
/** Resolve a {@link PathInput} to a geometry source (querySelector for strings). */
export declare function resolvePathGeometry(path: PathInput): PathGeometry;
/**
 * Wrap a path in a length-normalized sampler: feed it t in 0..1 and read back the
 * point plus tangent angle. Total length is measured once; each `at()` is two
 * getPointAtLength() reads (the point, and a neighbour for the tangent).
 */
export declare function samplePath(path: PathInput, options?: SamplePathOptions): PathSampler;
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