Installed some nugets

MVCUI/Scripts/umd/popper.js.flow

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+// @flow
+
+export type Position = 'top' | 'right' | 'bottom' | 'left';
+
+export type Placement =
+  | 'auto-start'
+  | 'auto'
+  | 'auto-end'
+  | 'top-start'
+  | 'top'
+  | 'top-end'
+  | 'right-start'
+  | 'right'
+  | 'right-end'
+  | 'bottom-end'
+  | 'bottom'
+  | 'bottom-start'
+  | 'left-end'
+  | 'left'
+  | 'left-start';
+
+export type Offset = {
+  top: number,
+  left: number,
+  width: number,
+  height: number,
+  position: Position,
+};
+
+export type Boundary = 'scrollParent' | 'viewport' | 'window';
+
+export type Behavior = 'flip' | 'clockwise' | 'counterclockwise';
+
+export type Data = {
+  instance: Popper,
+  placement: Placement,
+  originalPlacement: Placement,
+  flipped: boolean,
+  hide: boolean,
+  arrowElement: Element,
+  styles: CSSStyleDeclaration,
+  arrowStyles: CSSStyleDeclaration,
+  boundaries: Object,
+  offsets: {
+    popper: Offset,
+    reference: Offset,
+    arrow: {
+      top: number,
+      left: number,
+    },
+  },
+};
+
+export type ModifierFn = (data: Data, options: Object) => Data;
+
+export type Padding = {
+  top?: number,
+  bottom?: number,
+  left?: number,
+  right?: number,
+};
+
+export type BaseModifier = {
+  order?: number,
+  enabled?: boolean,
+  fn?: ModifierFn,
+};
+
+export type Modifiers = {
+  shift?: BaseModifier,
+  offset?: BaseModifier & {
+    offset?: number | string,
+  },
+  preventOverflow?: BaseModifier & {
+    priority?: Position[],
+    padding?: number | Padding,
+    boundariesElement?: Boundary | Element,
+    escapeWithReference?: boolean,
+  },
+  keepTogether?: BaseModifier,
+  arrow?: BaseModifier & {
+    element?: string | Element | null,
+  },
+  flip?: BaseModifier & {
+    behavior?: Behavior | Position[],
+    padding?: number | Padding,
+    boundariesElement?: Boundary | Element,
+    flipVariations?: boolean,
+    flipVariationsByContent?: boolean,
+  },
+  inner?: BaseModifier,
+  hide?: BaseModifier,
+  applyStyle?: BaseModifier & {
+    onLoad?: Function,
+    gpuAcceleration?: boolean,
+  },
+  computeStyle?: BaseModifier & {
+    gpuAcceleration?: boolean,
+    x?: 'bottom' | 'top',
+    y?: 'left' | 'right',
+  },
+
+  [name: string]: (BaseModifier & { [string]: * }) | null,
+};
+
+export type Options = {
+  placement?: Placement,
+  positionFixed?: boolean,
+  eventsEnabled?: boolean,
+  modifiers?: Modifiers,
+  removeOnDestroy?: boolean,
+
+  onCreate?: (data: Data) => void,
+
+  onUpdate?: (data: Data) => void,
+};
+
+export type ReferenceObject = {
+  +clientHeight: number,
+  +clientWidth: number,
+  +referenceNode?: Node,
+
+  getBoundingClientRect():
+    | ClientRect
+    | {
+        width: number,
+        height: number,
+        top: number,
+        right: number,
+        bottom: number,
+        left: number,
+      },
+};
+
+export type Instance = {
+  destroy: () => void,
+  scheduleUpdate: () => void,
+  update: () => void,
+  enableEventListeners: () => void,
+  disableEventListeners: () => void,
+};
+
+declare class Popper {
+  static placements: Placement;
+
+  popper: Element;
+  reference: Element | ReferenceObject;
+
+  constructor(
+    reference: Element | ReferenceObject,
+    popper: Element,
+    options?: Options
+  ): Instance;
+}
+
+declare export default typeof Popper;