Basic setup and working plugin

.gitignore

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+# 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/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# 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
+.cache
+
+# 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
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

README.md

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+# rollup-plugin-preserve-directives
+
+> Note: This plugin is still largely untested. It should work fine, but use at your own risk and please help me test it!
+
+This plugin preserves directives when `preserveModules: true` is set in the Rollup config.
+
+Rollup by default always removes directives like `'use client'` from the top of files. This makes sense when bundling files because directives should be applied per file, which is not possible when bundling.
+
+When `preserveModules: true` is set, because each module is a separate output file, it's possible to keep directives, which is exactly what this plugin does.
+
+## Getting started
+
+TODO
+
+## Disabling warnings
+
+TODO
+
+## Contributing, status and todos
+
+TODO

package.json

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+{
+  "name": "rollup-plugin-preserve-directives",
+  "description": "A Rollup plugin to preserve directives like \"use client\" when preserveModules is true.",
+  "version": "0.1.0",
+  "author": "Fredrik Höglund <[email protected]>",
+  "license": "MIT",
+  "keywords": [
+    "rollup-plugin"
+  ],
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch"
+  },
+  "peerDependencies": {
+    "rollup": "2.x || 3.x"
+  },
+  "devDependencies": {
+    "magic-string": "^0.30.0",
+    "rollup": "^3.19.1",
+    "typescript": "^4.9.5"
+  },
+  "files": [
+    "dist/index.js",
+    "dist/index.d.ts",
+    "README.md",
+    "LICENSE"
+  ]
+}