Add command to build a Swift Package for Add to App and generate FlutterPluginRegistrant by vashworth · Pull Request #181224 · flutter/flutter

vashworth · 2026-01-20T23:59:34Z

This PR introduces a new command flutter build swift-package, however, the command is not yet made available while we incrementally implement it.

This PR creates a FlutterPluginRegistrant swift package, currently with no dependencies. It also creates the GeneratedPluginRegistrant source files for the package.

It'll create a Package.swift like so:

import PackageDescription

// Debug

let package = Package(
    name: "FlutterPluginRegistrant",
    products: [
        .library(name: "FlutterPluginRegistrant", type: .static, targets: ["FlutterPluginRegistrant"])
    ],
    dependencies: [],
    targets: [
        .target(
            name: "FlutterPluginRegistrant"
        )
    ]
)

It also creates source files (GeneratedPluginRegistrant files) for each build mode and symlinks Sources and Package.swift to the first build mode (from the list of build modes passed in via args).

├── FlutterPluginRegistrant
│   ├── Debug
│   │   ├── FlutterPluginRegistrant
│   │   │   ├── GeneratedPluginRegistrant.m
│   │   │   ├── include
│   │   │   │   ├── GeneratedPluginRegistrant.h
│   │   ├── Package.swift
│   ├── Sources -> symlink to ./Debug
│   ├── Package.swift -> symlink to ./Debug/Package.swift

In this state, the package will not function since it's missing the plugin dependencies in the Package.swift. That will come in a future PR.

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
I followed the breaking change policy and added Data Driven Fixes where supported.
All existing and new tests are passing.

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Code Review

This pull request introduces a new command flutter build swift-package to generate Swift packages for Flutter projects and their plugins. The changes include adding a new command file, modifying existing plugin registrant functions to be more flexible, and updating the Swift package generation logic. New test cases have been added to cover the introduced functionality.