feat: replace esbuild with Rollup, add CJS/UMD bundles and deep import support

Build pipeline now consists of two passes:
  1. tsc --outDir dist  — individual ESM modules for deep imports
  2. rollup -c           — bundled ESM, CJS, and UMD (minified + unminified)

Package.json changes:
  - main/dist/index.cjs (CJS for require())
  - module/dist/index.js (ESM for bundlers)
  - types/dist/index.d.ts (bundled declarations via rollup-plugin-dts)
  - unpkg/dist/index.umd.js (CDN entry)
  - exports map with ./dist/* wildcard for deep imports
  - sideEffects: true since every component calls customElements.define
  - files: [dist, README.md]

tsconfig.json: adds declarationMap: true for Go-to-Definition to source.

Dependencies: removed esbuild, added rollup, @rollup/plugin-typescript,
@rollup/plugin-terser, rollup-plugin-dts, tslib.

package.json

@@ -2,17 +2,27 @@
   "name": "leaflet-components",
   "version": "0.1.0",
   "description": "LeafletJS as Web Components",
-  "main": "dist/index.js",
+  "main": "dist/index.cjs",
   "module": "dist/index.js",
   "types": "dist/index.d.ts",
+  "unpkg": "dist/index.umd.js",
   "exports": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/index.js",
-      "types": "./dist/index.d.ts"
-    }
+      "require": "./dist/index.cjs"
+    },
+    "./dist/*": "./dist/*",
+    "./package.json": "./package.json"
   },
+  "sideEffects": true,
+  "files": [
+    "dist",
+    "README.md"
+  ],
   "scripts": {
-    "build": "rm -rf dist && tsc --emitDeclarationOnly && esbuild src/index.ts --bundle --format=esm --outfile=dist/index.js",
+    "build": "rm -rf dist && tsc --outDir dist && rollup -c rollup.config.mjs",
+    "typecheck": "tsc --noEmit",
     "lint": "eslint 'src/**/*.{ts,js}'",
     "format": "prettier --write 'src/**/*.{ts,js,json,md}'",
     "prepublishOnly": "npm run build"
@@ -29,14 +39,18 @@
     "leaflet": "1.9.4"
   },
   "devDependencies": {
+    "@rollup/plugin-terser": "^1.0.0",
+    "@rollup/plugin-typescript": "^12.3.0",
     "@types/leaflet": "1.9.21",
     "@typescript-eslint/eslint-plugin": "8.60.1",
     "@typescript-eslint/parser": "8.60.1",
-    "esbuild": "^0.28.0",
     "eslint": "10.4.1",
     "eslint-config-prettier": "10.1.8",
     "eslint-plugin-prettier": "5.5.6",
     "prettier": "3.8.3",
+    "rollup": "^4.61.1",
+    "rollup-plugin-dts": "^6.4.1",
+    "tslib": "^2.8.1",
     "typescript": "6.0.3"
   }
 }

rollup.config.mjs

@@ -0,0 +1,25 @@
+import typescript from '@rollup/plugin-typescript';
+import terser from '@rollup/plugin-terser';
+import dts from 'rollup-plugin-dts';
+
+export default [
+  {
+    input: 'src/index.ts',
+    external: ['leaflet'],
+    plugins: [typescript({ declaration: false, declarationMap: false })],
+    output: [
+      { format: 'es',  file: 'dist/index.js' },
+      { format: 'es',  file: 'dist/index.min.js',       plugins: [terser()] },
+      { format: 'cjs', file: 'dist/index.cjs' },
+      { format: 'cjs', file: 'dist/index.min.cjs',      plugins: [terser()] },
+      { format: 'umd', name: 'LeafletComponents', file: 'dist/index.umd.js',    globals: { leaflet: 'L' } },
+      { format: 'umd', name: 'LeafletComponents', file: 'dist/index.umd.min.js', globals: { leaflet: 'L' }, plugins: [terser()] },
+    ],
+  },
+  {
+    input: 'src/index.ts',
+    external: ['leaflet'],
+    plugins: [dts()],
+    output: { format: 'es', file: 'dist/index.d.ts' },
+  },
+];

tsconfig.json

@@ -5,6 +5,7 @@
     "moduleResolution": "bundler",
     "lib": ["ESNext", "DOM", "DOM.Iterable"],
     "declaration": true,
+    "declarationMap": true,
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": true,