/**

 * Copyright (c) Meta Platforms, Inc. and affiliates.

 *

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

 *

 * @flow

 */

import type {

  CrossOriginEnum,

  PreloadImplOptions,

  PreloadModuleImplOptions,

  PreinitStyleOptions,

  PreinitScriptOptions,

  PreinitModuleScriptOptions,

} from 'react-dom/src/shared/ReactDOMTypes';

import ReactDOMSharedInternals from 'shared/ReactDOMSharedInternals';

const ReactDOMCurrentDispatcher = ReactDOMSharedInternals.Dispatcher;

import {ReactDOMFlightServerDispatcher} from './ReactDOMFlightServerHostDispatcher';

export function prepareHostDispatcher(): void {

  ReactDOMCurrentDispatcher.current = ReactDOMFlightServerDispatcher;

}

// Used to distinguish these contexts from ones used in other renderers.

// E.g. this can be used to distinguish legacy renderers from this modern one.

export const isPrimaryRenderer = true;

// We use zero to represent the absence of an explicit precedence because it is

// small, smaller than how we encode undefined, and is unambiguous. We could use

// a different tuple structure to encode this instead but this makes the runtime

// cost cheaper by eliminating a type checks in more positions.

type UnspecifiedPrecedence = 0;

// prettier-ignore

type TypeMap = {

  // prefetchDNS(href)

  'D': /* href */ string,

  // preconnect(href, options)

  'C':

    | /* href */ string

    | [/* href */ string, CrossOriginEnum],

  // preconnect(href, options)

  'L':

    | [/* href */ string, /* as */ string]

    | [/* href */ string, /* as */ string, PreloadImplOptions],

  'm':

    | /* href */ string

    | [/* href */ string, PreloadModuleImplOptions],

  'S':

    | /* href */ string

    | [/* href */ string, /* precedence */ string]

    | [/* href */ string, /* precedence */ string | UnspecifiedPrecedence, PreinitStyleOptions],

  'X':

    | /* href */ string

    | [/* href */ string, PreinitScriptOptions],

  'M':

    | /* href */ string

    | [/* href */ string, PreinitModuleScriptOptions],

}

export type HintCode = $Keys<TypeMap>;

export type HintModel<T: HintCode> = TypeMap[T];

export type Hints = Set<string>;

export function createHints(): Hints {

  return new Set();

}