/**
 * Schemdraw-style literals (aligned with Python `schemdraw/types.py`).
 */
export type Capstyle = "butt" | "round" | "square" | "projecting";
export type Joinstyle = "bevel" | "miter" | "round";
export type Linestyle = "-" | ":" | "--" | "-." | "None";
export type Halign = "center" | "left" | "right";
export type Valign = "center" | "top" | "bottom" | "base";
export type Arcdirection = "cw" | "ccw";
export type EndRef = "start" | "end";
export type Backends = "svg" | "matplotlib";
export type RotationMode = "anchor" | "default";
export type TextMode = "path" | "text";
/** Axis-aligned bounding box (drawing units). */
export type BBox = {
    readonly xmin: number;
    readonly ymin: number;
    readonly xmax: number;
    readonly ymax: number;
};
export declare function bbox(xmin: number, ymin: number, xmax: number, ymax: number): BBox;
/** Gradient: color1, color2, vertical flag. */
export type Gradient = readonly [string, string, boolean];
/** Python `schemdraw.types.ImageFormat` — matplotlib / save formats (TS 仅 SVG 管线常用 `svg`). */
export declare enum ImageFormat {
    EPS = "eps",
    JPG = "jpg",
    PDF = "pdf",
    PGF = "pgf",
    PNG = "png",
    PS = "ps",
    RAW = "raw",
    RGBA = "rgba",
    SVG = "svg",
    TIF = "tif"
}
/** Python `ImageType` literal union. */
export type ImageType = "eps" | "jpg" | "pdf" | "pgf" | "png" | "ps" | "raw" | "rgba" | "svg" | "tif";