Pod install fails with react-native build which includes luxon

[ajp8164]

Describe the bug
For a react-native project; can't install luxon and pod install. Reported error is..

[!] Invalid `Podfile` file: 783: unexpected token at 'Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './package.json' is not defined by "exports" in /Users/Andy/Development/ajp/AwesomeProject/node_modules/luxon/package.json

    at new NodeError (node:internal/errors:388:5)

    at throwExportsNotFound (node:internal/modules/esm/resolve:440:9)

    at packageExportsResolve (node:internal/modules/esm/resolve:719:3)

    at resolveExports (node:internal/modules/cjs/loader:488:36)

    at Module._findPath (node:internal/modules/cjs/loader:528:31)

    at Module._resolveFilename (node:internal/modules/cjs/loader:932:27)

    at Function.resolve (node:internal/modules/cjs/helpers:108:19)

    at resolveNodeModuleDir (/Users/Andy/Development/ajp/AwesomeProject/node_modules/@react-native-community/cli-tools/build/resolveNodeModuleDir.js:24:42)

    at /Users/Andy/Development/ajp/AwesomeProject/node_modules/@react-native-community/cli-config/build/loadConfig.js:93:76

    at Array.reduce (<anonymous>)

info Run CLI with --verbose flag for more details.
'.

To Reproduce

1. Create new react native project using npx react-native init AwesomeProject
2. cd AwesomeProject && npm i && cd ios && pod install && cd ..
3. npm i luxon
4. cd ios && pod install => produces error stated above

Works => npm uninstall luxon && cd ios && pod install

Actual vs Expected behavior
Expect the project to build.

Desktop (please complete the following information):

• Node 18.4.0
• Luxon version 3.0.1
• Ruby 2.7.5
• Cocoapods 1.11.3

Additional context
React native project uses react 18 and RN 0.69.1

[hatem-72]

Good catch.
Personally I had no reference to luxon in my error logs when running pod install.
So it took me a while to catch the culprit. But indeed luxon v3.0.1 caused an error on pod install for RN projects.

[!] Invalid `Podfile` file: source is not valid JSON!

 #  from /path-to-my-project/ios/Podfile:8
 #  -------------------------------------------
 #  target 'MyProject' do
 >    config = use_native_modules!
 #
 #  -------------------------------------------

[hatem-72]

In fact problem did not appear in v3.0.1 but in v2.5.0.
You can check changes here.
I guess it comes from the Support for ESM-style node imports part.

[hatem-72]

Exporting ./package.json inside luxon package.json seems to fix the issue.
I thought of doing this after running yarn react-native config.

I will submit a PR.

  "exports": {
    ".": {
      "import": "./src/luxon.js",
      "require": "./build/node/luxon.js"
    },
+   "./package.json": "./package.json",
  },