feat: add subpath exports

package.json

@@ -13,13 +13,11 @@
     "type": "git",
     "url": "https://github.com/receter/my-component-library"
   },
-  "sideEffects": [
-    "**/*.css"
-  ],
   "scripts": {
     "dev": "vite",
     "build": "tsc --p ./tsconfig-build.json && vite build",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "prepack": "node scripts/update-exports.mjs",
     "preview": "vite preview"
   },
   "peerDependencies": {
@@ -43,5 +41,30 @@
     "vite": "^4.5.3",
     "vite-plugin-dts": "^3.7.3",
     "vite-plugin-lib-inject-css": "^2.0.1"
-  }
+  },
+  "exports": {
+    ".": {
+      "types": "./dist/main.d.ts",
+      "default": "./dist/main.js"
+    },
+    "./Button": {
+      "types": "./dist/components/Button/index.d.ts",
+      "default": "./dist/components/Button/index.js"
+    },
+    "./Input": {
+      "types": "./dist/components/Input/index.d.ts",
+      "default": "./dist/components/Input/index.js"
+    },
+    "./Label": {
+      "types": "./dist/components/Label/index.d.ts",
+      "default": "./dist/components/Label/index.js"
+    }
+  },
+  "sideEffects": [
+    "**/*.css",
+    "./dist/main.js",
+    "./dist/components/Button/index.js",
+    "./dist/components/Input/index.js",
+    "./dist/components/Label/index.js"
+  ]
 }

scripts/update-exports.mjs

@@ -0,0 +1,29 @@
+import { readdir, readFile, writeFile } from 'node:fs/promises';
+
+const corePackageJsonPath = new URL('../package.json', import.meta.url);
+const corePackageJson = JSON.parse(await readFile(corePackageJsonPath, 'utf-8'));
+
+const coreComponentsDirectoryPath = new URL('../lib/components/', import.meta.url);
+const coreComponentsDirectory = await readdir(coreComponentsDirectoryPath);
+
+const paths = {
+	'.': {
+		types: './dist/main.d.ts',
+		default: './dist/main.js'
+	}
+};
+
+for (const item of coreComponentsDirectory) {
+	const filesInDirectory = await readdir(new URL(`${item}/`, coreComponentsDirectoryPath));
+	if (filesInDirectory.length) {
+		paths[`./${item}`] = {
+			types: `./dist/components/${item}/${filesInDirectory[0].replace(/\.tsx$/, '.d.ts')}`,
+			default: `./dist/components/${item}/${filesInDirectory[0].replace(/\.tsx$/, '.js')}`
+		};
+	}
+}
+
+corePackageJson.exports = paths;
+corePackageJson.sideEffects = ["**/*.css", ...Object.values(paths).map(e => e.default)];
+
+await writeFile(corePackageJsonPath, JSON.stringify(corePackageJson, null, '  '));