create-expo-cljs-app/template/node_modules/metro/src/lib/createModuleIdFactory.js.flow

Create a react native application with Expo and Shadow-CLJS!

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict
 * @format
 */

'use strict';

function createModuleIdFactory(): (path: string) => number {
  const fileToIdMap: Map<string, number> = new Map();
  let nextId = 0;
  return (path: string) => {
    let id = fileToIdMap.get(path);
    if (typeof id !== 'number') {
      id = nextId++;
      fileToIdMap.set(path, id);
    }
    return id;
  };
}

module.exports = createModuleIdFactory;