declare module "@tarojs/taro" {
  interface RenderingContext {
    // 变换
    scale(x: number, y: number): void;
    rotate(angle: number): void;
    translate(x: number, y: number): void;
    save(): void;
    restore(): void;

    // 路径
    beginPath(): void;
    closePath(): void;
    moveTo(x: number, y: number): void;
    lineTo(x: number, y: number): void;
    arc(
      x: number,
      y: number,
      radius: number,
      startAngle: number,
      endAngle: number,
      anticlockwise?: boolean
    ): void;
    arcTo(
      x1: number,
      y1: number,
      x2: number,
      y2: number,
      radius: number
    ): void;
    clip(): void;

    // 绘制
    drawImage(
      image: any,
      dx: number,
      dy: number,
      dWidth?: number,
      dHeight?: number
    ): void;
    fill(): void;
    stroke(): void;

    // 样式
    fillStyle: string | CanvasGradient | CanvasPattern;
    strokeStyle: string | CanvasGradient | CanvasPattern;
    font: string;
    textAlign: CanvasTextAlign;
    textBaseline: CanvasTextBaseline;

    // 文本
    fillText(text: string, x: number, y: number, maxWidth?: number): void;
    strokeText(text: string, x: number, y: number, maxWidth?: number): void;
    measureText(text: string): TextMetrics;

    // 渐变
    createLinearGradient(
      x0: number,
      y0: number,
      x1: number,
      y1: number
    ): CanvasGradient;
    createRadialGradient(
      x0: number,
      y0: number,
      r0: number,
      x1: number,
      y1: number,
      r1: number
    ): CanvasGradient;
  }
}