"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true,
});
exports.reactNativePlatformResolver = reactNativePlatformResolver;
/**
 * 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.
 *
 *
 * @format
 * @oncall react_native
 */

/**
 * This is an implementation of a metro resolveRequest option which will remap react-native imports
 * to different npm packages based on the platform requested.  This allows a single metro instance/config
 * to produce bundles for multiple out of tree platforms at a time.
 *
 * @param platformImplementations
 * A map of platform to npm package that implements that platform
 *
 * Ex:
 * {
 *    windows: 'react-native-windows'
 *    macos: 'react-native-macos'
 * }
 */
function reactNativePlatformResolver(platformImplementations) {
  return (context, moduleName, platform) => {
    let modifiedModuleName = moduleName;
    if (platform != null && platformImplementations[platform]) {
      if (moduleName === "react-native") {
        modifiedModuleName = platformImplementations[platform];
      } else if (moduleName.startsWith("react-native/")) {
        modifiedModuleName = `${
          platformImplementations[platform]
        }/${modifiedModuleName.slice("react-native/".length)}`;
      }
    }
    return context.resolveRequest(context, modifiedModuleName, platform);
  };
}