switch to monorepo structure

packages/core/.gitignore

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+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store

packages/core/README.md

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+# @markone/core
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.2.12. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

packages/core/package.json

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+{
+	"name": "@markone/core",
+	"module": "src/index.ts",
+	"type": "module",
+	"exports": {
+		"./bookmark": "./src/bookmark.ts",
+		"./user": "./src/user.ts"
+	},
+	"devDependencies": {
+		"@types/bun": "latest"
+	},
+	"peerDependencies": {
+		"typescript": "^5"
+	}
+}

packages/core/src/bookmark.ts

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+type BookmarkKind = "link" | "placeholder"
+
+interface LinkBookmark {
+	kind: "link"
+	id: string
+	title: string
+	url: string
+}
+
+interface PlaceholderBookmark {
+	id: string
+	kind: "placeholder"
+}
+
+type Bookmark = LinkBookmark | PlaceholderBookmark
+type BookmarkId = Bookmark["id"]
+
+export type { Bookmark, BookmarkId, BookmarkKind, LinkBookmark }

packages/core/src/user.ts

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+interface User {
+	id: string
+	username: string
+}
+
+const DEMO_USER = {
+	id: "01JTEP7T7A5YTM8YXEKHYQ46KK",
+	username: "demo-user",
+	unhashedPassword: "secure-hunter2",
+} as const
+
+export type { User }
+export { DEMO_USER }

packages/core/tsconfig.json

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+{
+  "compilerOptions": {
+    // Environment setup & latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "NodeNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "NodeNext",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": false,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+
+    // Some stricter flags (disabled by default)
+    "noPropertyAccessFromIndexSignature": false,
+
+		"outDir": "dist"
+  },
+	"include": ["src"]
+}