refactor: migrate app.config and Expo config plugins to TypeScript (#1718)

plugins/withGitPod.ts

@@ -0,0 +1,32 @@
+import { type ConfigPlugin, withPodfile } from "expo/config-plugins";
+
+interface GitPodOptions {
+  podName: string;
+  podspecUrl: string;
+}
+
+const withGitPod: ConfigPlugin<GitPodOptions> = (
+  config,
+  { podName, podspecUrl },
+) => {
+  return withPodfile(config, (config) => {
+    const podfile = config.modResults.contents;
+
+    const podLine = `  pod '${podName}', :podspec => '${podspecUrl}'`;
+
+    // Check if already added
+    if (podfile.includes(podLine)) {
+      return config;
+    }
+
+    // Insert after "use_expo_modules!"
+    config.modResults.contents = podfile.replace(
+      "use_expo_modules!",
+      `use_expo_modules!\n${podLine}`,
+    );
+
+    return config;
+  });
+};
+
+export default withGitPod;