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Upgrade to Shakapacker 9.0.0.beta.11 and migrate to SWC transpiler
- Update shakapacker from 8.2.0 to 9.0.0.beta.11 - Migrate from Babel to SWC transpiler for ~20x faster transpilation - Remove Babel-related packages and configuration - Add SWC dependencies (@swc/core, swc-loader) - Configure SWC in shakapacker.yml for all environments - Add config/swc.config.js for custom SWC configuration - Remove babel.config.js as it's no longer needed 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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‎Gemfile.development_dependencies‎

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# frozen_string_literal: true
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gem "shakapacker", "8.2.0"
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gem "shakapacker", "9.0.0.beta.11"
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gem "bootsnap", require: false
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gem "rails", "~> 7.1"
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‎Gemfile.lock‎

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rubyzip (>= 1.2.2, < 3.0)
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websocket (~> 1.0)
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semantic_range (3.1.0)
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shakapacker (8.2.0)
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shakapacker (9.0.0.beta.11)
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activesupport (>= 5.2)
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package_json
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rack-proxy (>= 0.6.1)
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scss_lint
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sdoc
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selenium-webdriver (= 4.9.0)
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shakapacker (= 8.2.0)
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shakapacker (= 9.0.0.beta.11)
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spring (~> 4.0)
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sprockets (~> 4.0)
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sqlite3 (~> 1.6)

‎spec/dummy/Gemfile.lock‎

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rubyzip (>= 1.2.2, < 3.0)
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websocket (~> 1.0)
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semantic_range (3.1.0)
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shakapacker (8.2.0)
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shakapacker (9.0.0.beta.11)
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activesupport (>= 5.2)
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package_json
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rack-proxy (>= 0.6.1)
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scss_lint
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sdoc
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selenium-webdriver (= 4.9.0)
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shakapacker (= 8.2.0)
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shakapacker (= 9.0.0.beta.11)
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spring (~> 4.0)
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sprockets (~> 4.0)
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sqlite3 (~> 1.6)

‎spec/dummy/babel.config.js‎

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‎spec/dummy/config/shakapacker.yml‎

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# Note: You must restart bin/shakapacker-dev-server for changes to take effect
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default: &default
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---
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default:
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source_path: client/app
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source_entry_path: packs
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public_root_path: public
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cache_path: tmp/cache/shakapacker
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webpack_compile_output: false
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ensure_consistent_versioning: 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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additional_paths: []
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# Reload manifest.json on all requests so we reload latest compiled packs
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additional_paths: &1 []
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cache_manifest: false
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nested_entries: true
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swc: true
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development:
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<<: *default
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# Turn this to true if you want to use the rails/shakapacker check that the test
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# bundles need building. Also, remove the customization to spec/rails_helper.rb.
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source_path: client/app
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source_entry_path: packs
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public_root_path: public
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cache_path: tmp/cache/shakapacker
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webpack_compile_output: false
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ensure_consistent_versioning: true
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additional_paths: *1
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cache_manifest: false
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nested_entries: true
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compile: false
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public_output_path: webpack/development
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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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# Hot Module Replacement updates modules while the application is running without a full reload
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hmr: true
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# Defaults to the inverse of hmr. Uncomment to manually set this.
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# live_reload: true
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client:
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# Should we show a full-screen overlay in the browser when there are compiler errors or warnings?
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overlay: true
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# May also be a string
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# webSocketURL:
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# hostname: "0.0.0.0"
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# pathname: "/ws"
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# port: 8080
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# Should we use gzip compression?
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compress: true
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# Note that apps that do not check the host are vulnerable to DNS rebinding attacks
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allowed_hosts: 'all'
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allowed_hosts: all
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pretty: true
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headers:
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'Access-Control-Allow-Origin': '*'
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Access-Control-Allow-Origin: "*"
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static:
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watch:
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ignored: '**/node_modules/**'
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ignored: "**/node_modules/**"
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swc: true
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test:
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<<: *default
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source_path: client/app
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source_entry_path: packs
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public_root_path: public
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cache_path: tmp/cache/shakapacker
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webpack_compile_output: false
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ensure_consistent_versioning: true
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additional_paths: *1
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cache_manifest: false
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nested_entries: true
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compile: false
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# Compile test packs to a separate directory
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public_output_path: webpack/test
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swc: true
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production:
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<<: *default
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source_path: client/app
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source_entry_path: packs
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public_root_path: public
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cache_path: tmp/cache/shakapacker
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webpack_compile_output: false
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ensure_consistent_versioning: true
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additional_paths: *1
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cache_manifest: true
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nested_entries: true
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public_output_path: webpack/production
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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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# Cache manifest.json for performance
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cache_manifest: true
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swc: true

‎spec/dummy/config/swc.config.js‎

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// config/swc.config.js
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// This file is merged with Shakapacker's default SWC configuration
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// See: https://swc.rs/docs/configuration/compilation
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module.exports = {
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jsc: {
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transform: {
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react: {
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runtime: 'automatic',
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},
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},
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},
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};

‎spec/dummy/package.json‎

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},
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"private": true,
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"dependencies": {
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"@babel/runtime": "7.17.9",
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"@hotwired/turbo-rails": "^8.0.4",
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"core-js": "3",
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"create-react-class": "^15.6.3",
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},
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"devDependencies": {
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"@babel/core": "7.17.9",
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"@babel/plugin-transform-runtime": "7.17.0",
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"@babel/preset-env": "7",
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"@babel/preset-react": "^7.10.4",
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"@pmmmwh/react-refresh-webpack-plugin": "^0.5.1",
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"@rescript/react": "^0.13.0",
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"@types/react": "^19.0.0",
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"@types/react-dom": "^19.0.0",
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"@types/react-helmet": "^6.1.5",
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"babel-loader": "8.2.4",
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"babel-plugin-transform-react-remove-prop-types": "^0.4.24",
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"compression-webpack-plugin": "9",
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"css-loader": "^6.5.1",
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"expose-loader": "^1.0.3",
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"webpack-assets-manifest": "5",
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"webpack-cli": "4",
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"webpack-dev-server": "^4.9.0",
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"webpack-merge": "5"
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"webpack-merge": "5",
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"@swc/core": "^1.7.39",
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"swc-loader": "^0.2.6"
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},
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"browser": {
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"fs": false

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