feat: Reduced package size by removing map files and duplicate type declarations from published package

Author: Vojtěch Václav Porteš

.gitignore

@@ -2,6 +2,7 @@
 .DS_Store
 node_modules
 .cache
+.npm-cache/
 .vite
 .rts2_cache_cjs
 .rts2_cache_esm

package.json

@@ -115,7 +115,22 @@
     "registry": "https://registry.npmjs.org"
   },
   "files": [
-    "dist"
+    "dist",
+    "!dist/**/*.map",
+    "!dist/**/*.d.ts",
+    "dist/index.d.ts",
+    "dist/parseQuery.d.ts",
+    "dist/formatQuery.d.ts",
+    "dist/bootstrap/v5/index.d.ts",
+    "dist/mui/v7/index.d.ts",
+    "dist/mui/v9/index.d.ts",
+    "dist/antd/v5/index.d.ts",
+    "dist/antd/v6/index.d.ts",
+    "dist/fluentui/v8/index.d.ts",
+    "dist/mantine/v8/index.d.ts",
+    "dist/mantine/v9/index.d.ts",
+    "dist/radix/v1/index.d.ts",
+    "dist/monaco/index.d.ts"
   ],
   "scripts": {
     "build": "tsdown && node scripts/copy-dts.mjs",

scripts/copy-dts.mjs

@@ -1,42 +1,50 @@
 /* global console */
 
-import { copyFile, readdir } from 'node:fs/promises';
+import { copyFile, readFile } from 'node:fs/promises';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
+const rootDir = path.resolve(__dirname, '..');
 const distDir = path.resolve(__dirname, '..', 'dist');
-
-const findDeclarationFiles = async (directory) => {
-  const entries = await readdir(directory, { withFileTypes: true });
-  const nestedFiles = await Promise.all(
-    entries.map(async (entry) => {
-      const resolvedPath = path.join(directory, entry.name);
-
-      if (entry.isDirectory()) {
-        return findDeclarationFiles(resolvedPath);
-      }
-
-      return entry.name.endsWith('.d.mts') ? [resolvedPath] : [];
-    })
+const packageJsonPath = path.join(rootDir, 'package.json');
+
+const getPublicDeclarationFiles = async () => {
+  const packageJson = JSON.parse(await readFile(packageJsonPath, 'utf8'));
+  const declarationFiles = new Set();
+
+  if (typeof packageJson.types === 'string') {
+    declarationFiles.add(path.resolve(rootDir, packageJson.types));
+  }
+
+  for (const exportDefinition of Object.values(packageJson.exports ?? {})) {
+    if (
+      exportDefinition &&
+      typeof exportDefinition === 'object' &&
+      typeof exportDefinition.types === 'string'
+    ) {
+      declarationFiles.add(path.resolve(rootDir, exportDefinition.types));
+    }
+  }
+
+  return [...declarationFiles].filter(fileName =>
+    fileName.startsWith(distDir) && fileName.endsWith('.d.ts')
   );
-
-  return nestedFiles.flat();
 };
 
 try {
-  const declarationFiles = await findDeclarationFiles(distDir);
+  const declarationFiles = await getPublicDeclarationFiles();
 
   await Promise.all(
     declarationFiles.map(fileName =>
       copyFile(
-        fileName,
-        fileName.replace(/\.d\.mts$/, '.d.ts')
+        fileName.replace(/\.d\.ts$/, '.d.mts'),
+        fileName
       )
     )
   );
 } catch (error) {
-  console.error('Unable to create .d.ts files from .d.mts build artifacts');
+  console.error('Unable to create public .d.ts files from .d.mts build artifacts');
   throw error;
 }

tsdown.config.ts

@@ -2,7 +2,9 @@ import { defineConfig } from 'tsdown';
 
 export default defineConfig({
   clean: true,
-  dts: true,
+  dts: {
+    cjsReexport: true,
+  },
   entry: {
     index: 'src/index.tsx',
     parseQuery: 'src/parseQuery/index.ts',
@@ -19,5 +21,5 @@ export default defineConfig({
     'monaco/index': 'src/monaco/index.ts',
   },
   format: ['esm', 'cjs'],
-  sourcemap: true,
+  sourcemap: false,
 });