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// @flow
export const top: 'top' = 'top';
export const bottom: 'bottom' = 'bottom';
export const right: 'right' = 'right';
export const left: 'left' = 'left';
export const auto: 'auto' = 'auto';
export type BasePlacement =
| typeof top
| typeof bottom
| typeof right
| typeof left;
export const basePlacements: Array<BasePlacement> = [top, bottom, right, left];
export const start: 'start' = 'start';
export const end: 'end' = 'end';
export type Variation = typeof start | typeof end;
export const clippingParents: 'clippingParents' = 'clippingParents';
export const viewport: 'viewport' = 'viewport';
export type Boundary =
| HTMLElement
| Array<HTMLElement>
| typeof clippingParents;
export type RootBoundary = typeof viewport | 'document';
export const popper: 'popper' = 'popper';
export const reference: 'reference' = 'reference';
export type Context = typeof popper | typeof reference;
export type VariationPlacement =
| 'top-start'
| 'top-end'
| 'bottom-start'
| 'bottom-end'
| 'right-start'
| 'right-end'
| 'left-start'
| 'left-end';
export type AutoPlacement = 'auto' | 'auto-start' | 'auto-end';
export type ComputedPlacement = VariationPlacement | BasePlacement;
export type Placement = AutoPlacement | BasePlacement | VariationPlacement;
export const variationPlacements: Array<VariationPlacement> = basePlacements.reduce(
(acc: Array<VariationPlacement>, placement: BasePlacement) =>
acc.concat([(`${placement}-${start}`: any), (`${placement}-${end}`: any)]),
[]
);
export const placements: Array<Placement> = [...basePlacements, auto].reduce(
(
acc: Array<Placement>,
placement: BasePlacement | typeof auto
): Array<Placement> =>
acc.concat([
placement,
(`${placement}-${start}`: any),
(`${placement}-${end}`: any),
]),
[]
);
// modifiers that need to read the DOM
export const beforeRead: 'beforeRead' = 'beforeRead';
export const read: 'read' = 'read';
export const afterRead: 'afterRead' = 'afterRead';
// pure-logic modifiers
export const beforeMain: 'beforeMain' = 'beforeMain';
export const main: 'main' = 'main';
export const afterMain: 'afterMain' = 'afterMain';
// modifier with the purpose to write to the DOM (or write into a framework state)
export const beforeWrite: 'beforeWrite' = 'beforeWrite';
export const write: 'write' = 'write';
export const afterWrite: 'afterWrite' = 'afterWrite';
export const modifierPhases: Array<ModifierPhases> = [
beforeRead,
read,
afterRead,
beforeMain,
main,
afterMain,
beforeWrite,
write,
afterWrite,
];
export type ModifierPhases =
| typeof beforeRead
| typeof read
| typeof afterRead
| typeof beforeMain
| typeof main
| typeof afterMain
| typeof beforeWrite
| typeof write
| typeof afterWrite;