fix(config): guard plugin for EAS Read app config phase

Author: murtazanoori

app.plugin.js

@@ -9,6 +9,8 @@ const {
 const DEP_LINE = 'implementation("androidx.core:core-splashscreen:1.0.1")';
 
 function ensureDependency(contents) {
+  // If gradle file isn't available during introspection, just return as-is.
+  if (typeof contents !== "string") return contents;
   if (contents.includes(DEP_LINE)) return contents; // already present
   return contents.replace(
     /dependencies\s*\{/m,
@@ -19,7 +21,16 @@ function ensureDependency(contents) {
 const withCoreSplashscreenDependency = (config) =>
   withAppBuildGradle(config, (config) => {
     try {
-      config.modResults.contents = ensureDependency(config.modResults.contents);
+      const updated = ensureDependency(config.modResults?.contents);
+      if (typeof updated === "string") {
+        config.modResults.contents = updated;
+      } else {
+        // During introspection (e.g., EAS Read app config) the file may not exist yet.
+        WarningAggregator.addWarningAndroid(
+          "core-splashscreen",
+          "Skipped adding androidx.core:core-splashscreen; app/build.gradle not available during introspection.",
+        );
+      }
     } catch (e) {
       WarningAggregator.addWarningAndroid(
         "core-splashscreen",