interface Link {
  target: number,
  type: 'FS' | 'FF' | 'SS' | 'SF'
}

interface Item {
  id: number,
  parent: number,
  text: string,
  start: Date,
  end: Date,
  percent: number,
  links: Array<Link>
}

type StyleOptions = {
  bgColor: string,           // default: '#fff'
  lineColor: string,         // default: '#eee'
  redLineColor: string,      // default: '#f04134'
  groupBack: string,         // default: '#3db9d3'
  groupFront: string,        // default: '#299cb4'
  taskBack: string,          // default: '#65c16f'
  taskFront: string,         // default: '#46ad51'
  milestone: string,         // default: '#d33daf'
  warning: string,           // default: '#faad14'
  danger: string,            // default: '#f5222d'
  link: string,              // default: '#ffa011'
  textColor: string,         // default: '#222'
  lightTextColor: string,    // default: '#999'
  lineWidth: string,         // default: '1px'
  thickLineWidth: string,    // default: '1.4px'
  fontSize: string,          // default: '14px'
  smallFontSize: string,     // default: '12px'
  fontFamily: string,        // default: '-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif'
}

type Options = {
  viewMode: 'day' | 'week' | 'month',
  onClick: (item: Item) => {},
  offsetY: number,               // default: 60,
  rowHeight: number,             // default: 40,
  barHeight: number,             // default: 16,
  thickWidth: number,            // default: 1.4,
  styleOptions: StyleOptions
}

declare class SVGGantt {
  constructor(element: string | HTMLElement, data: Array<Item>, options: Options);
  setData(data: Array<Item>): void;      // set data and re-render
  setOptions(options: Options): void;    // set options and re-render
  render(): void;
}

declare class CanvasGantt {
  constructor(element: string | HTMLElement, data: Array<Item>, options: Options);
  setData(data: Array<Item>): void;      // set data and re-render
  setOptions(options: Options): void;    // set options and re-render
  render(): void;
}

declare class StrGantt {
  constructor(data: Array<Item>, options: Options);
  setData(data: Array<Item>): void;
  setOptions(options: Options): void;
  render(): string;
}