質問編集履歴
2
ファイル名プレビューで映るように
    
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            docker-compose.yml
         
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            version: '3'
         
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            services:
         
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              db:
         
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            webpacker.yml
         
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            ```webpacker.yml
         
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            # Note: You must restart bin/webpack-dev-server for changes to take effect
         
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1
補足情報を追加
    
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            ruby 2.6.3
         
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            Rails 6.0.3.4
         
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            webpacker 4.3.0
         
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            Docker version 20.10.2
         
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            Docker version 20.10.2
         
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            ```Dockerfile
         
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            FROM ruby:2.7
         
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            RUN apt-get update -qq && \
         
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                apt-get install -y apt-utils \
         
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                                   build-essential \
         
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                                   libpq-dev \
         
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                                   nodejs \
         
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                                   default-mysql-client \
         
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                                   yarn
         
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            RUN mkdir /myapp
         
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            WORKDIR /myapp
         
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            COPY Gemfile /myapp/Gemfile
         
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            COPY Gemfile.lock /myapp/Gemfile.lock
         
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            RUN bundle install
         
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            COPY . /myapp
         
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            USER postgres
         
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            # Add a script to be executed every time the container starts.
         
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            COPY entrypoint.sh /usr/bin/
         
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            RUN chmod +x /usr/bin/entrypoint.sh
         
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            ENTRYPOINT ["entrypoint.sh"]
         
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            EXPOSE 3000
         
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            # Start the main process.
         
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            CMD ["rails", "server", "-b", "0.0.0.0"]
         
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            # Railsに必要なパッケージをインストール
         
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            RUN apt-get update -qq && apt-get install -y nodejs
         
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            RUN curl -sL https://deb.nodesource.com/setup_10.x | bash - \
         
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                && apt-get install -y nodejs
         
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            EXPOSE 8080
         
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            ```
         
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            ```docker-compose.yml
         
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            version: '3'
         
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            services:
         
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              db:
         
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                image: postgres
         
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                volumes:
         
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                  - ./tmp/db:/var/lib/postgresql/data
         
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                environment:
         
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                  POSTGRES_PASSWORD: 'postgres'
         
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              web:
         
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                build: .
         
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                command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
         
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                volumes:
         
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                  - .:/myapp
         
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                ports:
         
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                  - "3000:3000"
         
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                depends_on:
         
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                  - db
         
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              postgres:
         
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                image: postgres:13
         
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                user: postgres
         
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            ```
         
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            ```Gemfile
         
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            source 'https://rubygems.org'
         
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            git_source(:github) { |repo| "https://github.com/#{repo}.git" }
         
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            gem 'rails', '~> 6.0.3.4'
         
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            gem 'puma', '~> 3.11'
         
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            gem 'sassc-rails', '2.1.2'
         
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            gem 'uglifier', '>= 1.3.0'
         
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            gem 'coffee-rails', '~> 4.2'
         
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            gem 'turbolinks', '~> 5'
         
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            gem 'jbuilder', '~> 2.5'
         
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            gem 'bootsnap', '>= 1.1.0', require: false
         
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            gem 'bootstrap', '~> 4.5.0'
         
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            gem 'jquery-rails'
         
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            gem 'webpacker', '~> 4.0'
         
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            group :development, :test do
         
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              gem 'rspec-rails'
         
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              gem 'sqlite3'
         
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              gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
         
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            end
         
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            group :development do
         
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              gem 'web-console', '>= 3.3.0'
         
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              gem 'listen', '>= 3.0.5', '< 3.2'
         
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              gem 'spring'
         
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              gem 'spring-watcher-listen', '~> 2.0.0'
         
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            end
         
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            group :test do
         
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              gem 'capybara', '>= 2.15'
         
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              gem 'selenium-webdriver'
         
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              gem 'chromedriver-helper'
         
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            end
         
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            group :production do
         
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              gem 'pg'
         
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            end
         
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            gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
         
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            ```
         
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            ```webpacker.yml
         
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            # Note: You must restart bin/webpack-dev-server for changes to take effect
         
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            default: &default
         
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              source_path: app/javascript
         
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              source_entry_path: packs
         
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              public_root_path: public
         
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              public_output_path: packs
         
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              cache_path: tmp/cache/webpacker
         
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              check_yarn_integrity: false
         
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              webpack_compile_output: true
         
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              # Additional paths webpack should lookup modules
         
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              # ['app/assets', 'engine/foo/app/assets']
         
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              resolved_paths: []
         
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              # Reload manifest.json on all requests so we reload latest compiled packs
         
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              cache_manifest: false
         
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              # Extract and emit a css file
         
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              extract_css: false
         
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              static_assets_extensions:
         
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                - .jpg
         
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            +
                - .jpeg
         
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                - .png
         
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                - .gif
         
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                - .tiff
         
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                - .ico
         
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                - .svg
         
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                - .eot
         
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                - .otf
         
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                - .ttf
         
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                - .woff
         
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                - .woff2
         
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              extensions:
         
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                - .mjs
         
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                - .js
         
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                - .sass
         
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                - .scss
         
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                - .css
         
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                - .module.sass
         
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                - .module.scss
         
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                - .module.css
         
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                - .png
         
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            +
                - .svg
         
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                - .gif
         
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                - .jpeg
         
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                - .jpg
         
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            +
             
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            development:
         
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              <<: *default
         
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              compile: true
         
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            +
             
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            +
              # Verifies that correct packages and versions are installed by inspecting package.json, yarn.lock, and node_modules
         
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            +
              check_yarn_integrity: true
         
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            +
             
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            +
              # Reference: https://webpack.js.org/configuration/dev-server/
         
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              dev_server:
         
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                https: false
         
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                host: localhost
         
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                port: 3035
         
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                public: localhost:3035
         
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                hmr: false
         
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            +
                # Inline should be set to true if using HMR
         
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                inline: true
         
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                overlay: true
         
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                compress: true
         
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                disable_host_check: true
         
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                use_local_ip: false
         
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                quiet: false
         
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                pretty: false
         
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                headers:
         
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            +
                  'Access-Control-Allow-Origin': '*'
         
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            +
                watch_options:
         
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            +
                  ignored: '**/node_modules/**'
         
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            +
             
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            +
             
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            +
            test:
         
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              <<: *default
         
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            +
              compile: true
         
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            +
             
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            +
              # Compile test packs to a separate directory
         
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            +
              public_output_path: packs-test
         
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            +
             
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            production:
         
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              <<: *default
         
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            +
             
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            +
              # Production depends on precompilation of packs prior to booting for performance.
         
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            +
              compile: false
         
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            +
             
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            +
              # Extract and emit a css file
         
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            +
              extract_css: true
         
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            +
             
     | 
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            +
              # Cache manifest.json for performance
         
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            +
              cache_manifest: true
         
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            +
             
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            +
            ```
         
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