firebase/flutterfire

Migrates to built-in Kotlin

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#18304 opened on May 21, 2026

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good first issuetype: enhancement

Description

Following plugin apply Kotlin Gradle Plugin (KGP): firebase_remote_config

Future versions of Flutter will fail to build if your app uses plugins that apply KGP.

Here is a guide on filing an issue against a plugin: https://docs.flutter.dev/release/breaking-changes/migrate-to-built-in-kotlin/for-app-developers#report-incompatible-kotlin-gradle-plugin-usage-to-plugin-authors

Contributor guide

Tech stack
kotlin
Domain
mobilebuild system
Issue type
refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
familiarity with Flutter plugin structureunderstanding of Kotlin Gradle Pluginability to modify Gradle build files
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Examine the `android/build.gradle` file of the `firebase remote config` plugin. Identify where the Kotlin Gradle Plugin is applied (e.g., `apply plugin: 'kotlin android'` or similar). Remove that application and ensure the plugin relies on Flutter's built in Kotlin support instead. Follow the official Flutter migration guide linked in the issue to ensure compatibility.