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+/**
+ * @fileoverview This file only declares the public portions of the API.
+ * It should not define internal pieces such as utils or modifier details.
+ *
+ * Original definitions by: edcarroll <https://github.com/edcarroll>, ggray <https://github.com/giladgray>, rhysd <https://rhysd.github.io>, joscha <https://github.com/joscha>, seckardt <https://github.com/seckardt>, marcfallows <https://github.com/marcfallows>
+ */
+
+/**
+ * This kind of namespace declaration is not necessary, but is kept here for backwards-compatibility with
+ * popper.js 1.x. It can be removed in 2.x so that the default export is simply the Popper class
+ * and all the types / interfaces are top-level named exports.
+ */
+declare namespace Popper {
+  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 Boundary = 'scrollParent' | 'viewport' | 'window';
+
+  export type Behavior = 'flip' | 'clockwise' | 'counterclockwise';
+
+  export type ModifierFn = (data: Data, options: Object) => Data;
+
+  export interface Attributes {
+    'x-out-of-boundaries': '' | false;
+    'x-placement': Placement;
+  }
+
+  export interface Padding {
+    top?: number,
+    bottom?: number,
+    left?: number,
+    right?: number,
+  }
+
+  export interface BaseModifier {
+    order?: number;
+    enabled?: boolean;
+    fn?: ModifierFn;
+  }
+
+  export interface 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,
+    };
+    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 & Record<string, any>) | undefined;
+  }
+
+  export interface Offset {
+    top: number;
+    left: number;
+    width: number;
+    height: number;
+  }
+
+  export interface Data {
+    instance: Popper;
+    placement: Placement;
+    originalPlacement: Placement;
+    flipped: boolean;
+    hide: boolean;
+    arrowElement: Element;
+    styles: CSSStyleDeclaration;
+    arrowStyles: CSSStyleDeclaration;
+    attributes: Attributes;
+    boundaries: Object;
+    offsets: {
+      popper: Offset,
+      reference: Offset,
+      arrow: {
+        top: number,
+        left: number,
+      },
+    };
+  }
+
+  export interface PopperOptions {
+    placement?: Placement;
+    positionFixed?: boolean;
+    eventsEnabled?: boolean;
+    modifiers?: Modifiers;
+    removeOnDestroy?: boolean;
+
+    onCreate?(data: Data): void;
+
+    onUpdate?(data: Data): void;
+  }
+
+  export interface ReferenceObject {
+    clientHeight: number;
+    clientWidth: number;
+    referenceNode?: Node;
+
+    getBoundingClientRect(): ClientRect;
+  }
+}
+
+// Re-export types in the Popper namespace so that they can be accessed as top-level named exports.
+// These re-exports should be removed in 2.x when the "declare namespace Popper" syntax is removed.
+export type Padding = Popper.Padding;
+export type Position = Popper.Position;
+export type Placement = Popper.Placement;
+export type Boundary = Popper.Boundary;
+export type Behavior = Popper.Behavior;
+export type ModifierFn = Popper.ModifierFn;
+export type BaseModifier = Popper.BaseModifier;
+export type Modifiers = Popper.Modifiers;
+export type Offset = Popper.Offset;
+export type Data = Popper.Data;
+export type PopperOptions = Popper.PopperOptions;
+export type ReferenceObject = Popper.ReferenceObject;
+
+declare class Popper {
+  static modifiers: (BaseModifier & { name: string })[];
+  static placements: Placement[];
+  static Defaults: PopperOptions;
+
+  options: PopperOptions;
+  popper: Element;
+  reference: Element | ReferenceObject;
+
+  constructor(reference: Element | ReferenceObject, popper: Element, options?: PopperOptions);
+
+  destroy(): void;
+
+  update(): void;
+
+  scheduleUpdate(): void;
+
+  enableEventListeners(): void;
+
+  disableEventListeners(): void;
+}
+
+export default Popper;