feat: add react-native-permissions config plugin

packages/react-native-permissions/.eslintrc.js

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+// @generated by expo-module-scripts
+module.exports = require('expo-module-scripts/eslintrc.base.js');

packages/react-native-permissions/README.md

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+# @config-plugins/react-native-permissions
+
+Expo Config Plugin to auto-configure [`react-native-permissions`](https://www.npmjs.com/package/react-native-permissions) when the native code is generated (`expo prebuild`).
+
+## Expo installation
+
+> Tested against Expo SDK 46
+
+This package cannot be used in the "Expo Go" app because [it requires custom native code](https://docs.expo.io/workflow/customizing/).
+
+- First install the package with yarn, npm, or [`expo install`](https://docs.expo.io/workflow/expo-cli/#expo-install).
+
+```sh
+expo install react-native-permissions @config-plugins/react-native-permissions
+```
+
+After installing this npm package, add the [config plugin](https://docs.expo.io/guides/config-plugins/) to the [`plugins`](https://docs.expo.io/versions/latest/config/app/#plugins) array of your `app.json` or `app.config.js` and provide a list of [permission handlers](https://github.com/zoontek/react-native-permissions#ios) that should be installed:
+
+> You can omit the `Permission-` prefix from the pod name, eg. `Permission-Camera` should be just `Camera`:
+
+```json
+{
+  "expo": {
+    "plugins": [
+      [
+        "@config-plugins/react-native-permissions",
+        { "pods": ["Camera", "Notifications"] }
+      ]
+    ]
+  }
+}
+```
+
+Next, rebuild your app as described in the ["Adding custom native code"](https://docs.expo.io/workflow/customizing/) guide.
+
+⚠️ Please note that this config plugin doesn't handle the configuration of Android permissions since Expo provides a [built-in way](https://docs.expo.dev/guides/permissions/#android) to do that. Same applies for [iOS permission messages](https://docs.expo.dev/guides/permissions/#ios) in your `Info.plist`. You will need to configure those in order to use `react-native-permissions` properly.

packages/react-native-permissions/app.plugin.js

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+module.exports = require("./build/withReactNativePermissions");

packages/react-native-permissions/package.json

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+{
+  "name": "@config-plugins/react-native-permissions",
+  "version": "1.0.0",
+  "description": "Config plugin to auto configure react-native-permissions on prebuild",
+  "main": "build/withReactNativePermissions.js",
+  "types": "build/withReactNativePermissions.d.ts",
+  "sideEffects": false,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/expo/config-plugins.git",
+    "directory": "packages/react-native-permissions"
+  },
+  "scripts": {
+    "build": "expo-module build",
+    "clean": "expo-module clean",
+    "lint": "expo-module lint",
+    "test": "expo-module test",
+    "prepare": "expo-module prepare",
+    "prepublishOnly": "expo-module prepublishOnly",
+    "expo-module": "expo-module"
+  },
+  "keywords": [
+    "react",
+    "expo",
+    "config-plugins",
+    "prebuild",
+    "react-native-permissions"
+  ],
+  "jest": {
+    "preset": "expo-module-scripts"
+  },
+  "peerDependencies": {
+    "expo": "^46.0.2"
+  },
+  "devDependencies": {
+    "expo-module-scripts": "^2.0.0"
+  },
+  "upstreamPackage": "react-native-permissions"
+}

packages/react-native-permissions/src/withReactNativePermissions.ts

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+import {
+  withDangerousMod,
+  ConfigPlugin,
+  createRunOncePlugin,
+} from "@expo/config-plugins";
+import { mergeContents } from "@expo/config-plugins/build/utils/generateCode";
+import fs from "fs";
+import path from "path";
+
+const withReactNativePermissions: ConfigPlugin<{ pods: string[] }> = (
+  config,
+  { pods }
+) => {
+  return withDangerousMod(config, [
+    "ios",
+    async (config) => {
+      const filePath = path.join(
+        config.modRequest.platformProjectRoot,
+        "Podfile"
+      );
+
+      const contents = fs.readFileSync(filePath, "utf-8");
+
+      const result = mergeContents({
+        tag: "react-native-permissions",
+        src: contents,
+        newSrc: getPodfileContent(pods),
+        anchor: /use_native_modules/,
+        offset: 0,
+        comment: "#",
+      });
+
+      fs.writeFileSync(filePath, result.contents);
+
+      return config;
+    },
+  ]);
+};
+
+function getPodfileContent(pods: string[]) {
+  return `
+  permissions_path = '../node_modules/react-native-permissions/ios'
+  ${pods
+    .map(
+      (pod) => `pod 'Permission-${pod}', :path => "#{permissions_path}/${pod}"`
+    )
+    .join("\n  ")}
+`;
+}
+
+export default createRunOncePlugin(
+  withReactNativePermissions,
+  "react-native-permissions"
+);

packages/react-native-permissions/tsconfig.json

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+{
+  "extends": "expo-module-scripts/tsconfig.plugin",
+  "compilerOptions": {
+    "outDir": "./build"
+  },
+  "include": ["./src"],
+  "exclude": ["**/__mocks__/*", "**/__tests__/*"]
+}