Use yarn 4

.gitignore

@@ -1,68 +1,163 @@
+# Created by https://www.toptal.com/developers/gitignore/api/node,yarn
+# Edit at https://www.toptal.com/developers/gitignore?templates=node,yarn
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
 node_modules/
-.node_modules/
-built/*
-tests/cases/rwc/*
-tests/cases/perf/*
-!tests/cases/webharness/compilerToString.js
-test-args.txt
-~*.docx
-\#*\#
-.\#*
-tests/baselines/local/*
-tests/baselines/local.old/*
-tests/services/baselines/local/*
-tests/baselines/prototyping/local/*
-tests/baselines/rwc/*
-tests/baselines/reference/projectOutput/*
-tests/baselines/local/projectOutput/*
-tests/baselines/reference/testresults.tap
-tests/services/baselines/prototyping/local/*
-tests/services/browser/typescriptServices.js
-src/harness/*.js
-src/compiler/diagnosticInformationMap.generated.ts
-src/compiler/diagnosticMessages.generated.json
-src/parser/diagnosticInformationMap.generated.ts
-src/parser/diagnosticMessages.generated.json
-rwc-report.html
-*.swp
-build.json
-*.actual
-tests/webTestServer.js
-tests/webTestServer.js.map
-tests/webhost/*.d.ts
-tests/webhost/webtsc.js
-tests/cases/**/*.js
-tests/cases/**/*.js.map
-*.config
-scripts/eslint/built/
-scripts/debug.bat
-scripts/run.bat
-scripts/**/*.js
-scripts/**/*.js.map
-coverage/
-internal/
-**/.DS_Store
-.settings
-**/.vs
-**/.vscode/*
-!**/.vscode/tasks.json
-!**/.vscode/settings.template.json
-!**/.vscode/launch.template.json
-!**/.vscode/extensions.json
-!tests/cases/projects/projectOption/**/node_modules
-!tests/cases/projects/NodeModulesSearch/**/*
-!tests/baselines/reference/project/nodeModules*/**/*
-.idea
-yarn-error.log
-.parallelperf.*
-tests/baselines/reference/dt
-.failed-tests
-TEST-results.xml
-package-lock.json
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
 .eslintcache
-*v8.log
-/lib/
-dist/
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
 .env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
 .yarn/cache
-src/generated/**/*
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+### Node Patch ###
+# Serverless Webpack directories
+.webpack/
+
+# Optional stylelint cache
+
+# SvelteKit build / generate output
+.svelte-kit
+
+### yarn ###
+# https://yarnpkg.com/getting-started/qa#which-files-should-be-gitignored
+
+.yarn/*
+!.yarn/releases
+!.yarn/patches
+!.yarn/plugins
+!.yarn/sdks
+!.yarn/versions
+
+# if you are NOT using Zero-installs, then:
+# comment the following lines
+# !.yarn/cache
+
+# and uncomment the following lines
+.pnp.*
+
+# End of https://www.toptal.com/developers/gitignore/api/node,yarn
+
+src/generated