[Feature Request] Flutter for Web support

[salihgueler]

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Amplify Hosting feature

Frontend builds, One click deploy

Is your feature request related to a problem? Please describe:

According to the StackOverflow survey in 2024, Flutter is the biggest cross-platform development SDK (with 9.4%) for building apps. Right now AWS Amplify does not support hosting Flutter Web applications.

Describe how you'd like this feature to work

It can immediately understand if the Flutter app has Web support, deploy it by getting a build for it. We will have the Flutter SDK already loaded and ready to be used to build the app. With custom deployments this will work like the following:

version: 1
backend:
  phases:
    build:
      commands:
        - npm ci --cache .npm --prefer-offline
        - npx ampx pipeline-deploy --branch $AWS_BRANCH --app-id $AWS_APP_ID --outputs-format dart --outputs-out-dir lib
frontend:
  phases:
    preBuild:
      commands:
        - echo "Installing Flutter SDK"
        - git clone https://github.com/flutter/flutter.git -b stable --depth 1
        - export PATH="$PATH:$(pwd)/flutter/bin"
        - flutter config --no-analytics
        - flutter doctor
    build:
      commands:
        - echo "Installing dependencies"
        - flutter pub get
        - echo "Building Flutter web application with WASM support"
        - flutter build web
  artifacts:
    baseDirectory: build/web
    files:
      - '**/*'
  cache:
    paths:
      - flutter/.pub-cache

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