import _WidgetBase = require("dijit/_WidgetBase");

export interface BuildContext {
    getDomElement(): HTMLElement;
}

export function isNode(el: any): el is HTMLElement {
    return el && el.nodeName && el.nodeType;
}

export function isWidget(v: any): v is _WidgetBase {
    return v && "domNode" in v;
}

export function isBuildContext(v: any): v is BuildContext {
    return typeof v === "object" && typeof v.getDomElement === "function";
}

export function isPlainObject(v: object) {
    if (typeof v !== "object")
        return false;

    const vp = Object.getPrototypeOf(v);
    return !vp || vp === Object.prototype;
}

export type _WidgetBaseConstructor = dijit._WidgetBaseConstructor<_WidgetBase>;

export function isWidgetConstructor(v: any): v is _WidgetBaseConstructor {
    return typeof v === "function" && v.prototype && "domNode" in v.prototype;
}