Add INTERNALLY_TEST_PREBUILD

CONTRIBUTING.md

@@ -5,3 +5,6 @@ The example project is linked specifically to simplify development. This means i
 - The swift files in the targets folder are linked to the root project instead of duplicated. If adding new swift files, try to link them instead of duplicating to keep things clean.
 - The entitlements and info.plist files however duplicated - to not mess with the example project/signing etc.
 - There is a Shared.swift file that can be accessed by all targets. This is linked to each target in the example project, but in the published package it's copied and duplicated to each target. I prefer this to making more changes in @bacons/xcode package which only supports swift files on the root level of each target directory.
+
+## Prebuild
+To try out prebuild functionality (i.e. the config plugin) run `npm run prebuild` in the example project (it uses the `INTERNALLY_TEST_PREBUILD` env variable to behave like a published package). This should be used to verify changes are expected, but the result should not in it's full state be commited to the example project, since it will break the DX of the example project as explained above.

config-plugin/getAppGroupFromExpoConfig.js

@@ -8,8 +8,9 @@ const getAppGroupFromExpoConfig = (config) => {
     if (Array.isArray(plugin)) {
       const [pluginName] = plugin;
       return (
-        pluginName === "react-native-device-activity"
-        // || pluginName === "../app.plugin.js" // only for trying it out locally
+        pluginName === "react-native-device-activity" ||
+        (process.env.INTERNALLY_TEST_PREBUILD &&
+          pluginName === "../app.plugin.js")
       );
     }
 

config-plugin/withCopyTargetFolder.js

@@ -2,7 +2,7 @@ const fs = require("fs");
 
 /** @type {import('@expo/config-plugins').ConfigPlugin<{ appGroup: string; copyToTargetFolder?: boolean }>} */
 const withCopyTargetFolder = (config, { copyToTargetFolder = true }) => {
-  if (!copyToTargetFolder) {
+  if (!copyToTargetFolder && !process.env.INTERNALLY_TEST_PREBUILD) {
     return config;
   }
 

example/package.json

@@ -7,7 +7,8 @@
     "android": "expo run:android",
     "ios": "expo run:ios",
     "web": "expo start --web",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "prebuild": "rm -rf targets && INTERNALLY_TEST_PREBUILD=true npx expo prebuild --platform=ios --clean"
   },
   "dependencies": {
     "expo": "~51.0.39",