dynamicImportCache.js — react Source File

Source Code

/**
 * 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 {__DEBUG__} from 'react-devtools-shared/src/constants';

import type {
  Thenable,
  FulfilledThenable,
  RejectedThenable,
} from 'shared/ReactTypes';

import * as React from 'react';

const TIMEOUT = 30000;

type Module = any;
type ModuleLoaderFunction = () => Thenable<Module>;

// This is intentionally a module-level Map, rather than a React-managed one.
// Otherwise, refreshing the inspected element cache would also clear this cache.
// Modules are static anyway.
const moduleLoaderFunctionToModuleMap: Map<ModuleLoaderFunction, Module> =
  new Map();
function readRecord<T>(record: Thenable<T>): T | null {
  if (typeof React.use === 'function') {
    try {
      // eslint-disable-next-line react-hooks-published/rules-of-hooks
      return React.use(record);
    } catch (x) {
      if (x === null) {
        return null;
      }
      throw x;
    }
  }
  if (record.status === 'fulfilled') {
    return record.value;
  } else if (record.status === 'rejected') {
    return null;
  } else {
    throw record;
  }
}

// TODO Flow type
export function loadModule(moduleLoaderFunction: ModuleLoaderFunction): Module {
  let record = moduleLoaderFunctionToModuleMap.get(moduleLoaderFunction);

  if (__DEBUG__) {
    console.log(
      `[dynamicImportCache] loadModule("${moduleLoaderFunction.name}")`,
    );
  }

// ... (109 more lines)