chore: add in typegen

package.json

@@ -10,22 +10,26 @@
   },
   "exports": {
     ".": {
+      "types": "./dist/types/index.d.ts",
       "require": "./dist/cjs/index.js",
       "import": "./dist/esm/index.js",
       "default": "./dist/esm/index.js"
     },
     "./djb2": {
+      "types": "./dist/types/djb2.d.ts",
       "require": "./dist/cjs/djb2.js",
       "import": "./dist/esm/djb2.js",
       "default": "./dist/esm/djb2.js"
     },
     "./sdbm": {
+      "types": "./dist/types/sdbm.d.ts",
       "require": "./dist/cjs/sdbm.js",
       "import": "./dist/esm/sdbm.js",
       "default": "./dist/esm/sdbm.js"
     },
     "./package.json": "./package.json"
   },
+  "types": "./dist/types/index.d.ts",
   "main": "./dist/cjs/index.js",
   "module": "./dist/esm/index.js",
   "files": [
@@ -46,6 +50,9 @@
     "rollup": "^4.4.0",
     "rollup-node-externals": "0.0.1-2",
     "rollup-plugin-node-externals": "^6.1.2",
+    "rollup-plugin-typescript2": "^0.36.0",
+    "tslib": "^2.6.2",
+    "typescript": "^5.3.2",
     "uvu": "^0.5.6"
   },
   "publishConfig": {

rollup.config.js

@@ -2,9 +2,29 @@ import { dirname, join } from 'node:path'
 import { nodeExternals } from 'rollup-plugin-node-externals'
 import fs, { mkdir } from 'node:fs/promises'
 import { existsSync } from 'node:fs'
+import typescriptPlugin from 'rollup-plugin-typescript2'
 
 const common = {
-  plugins: [nodeExternals(), createPackages()],
+  plugins: [
+    nodeExternals(),
+    createPackages(),
+    typescriptPlugin({
+      useTsconfigDeclarationDir: true,
+      include: ['./src/*.js+(|x)', './src/**/*.js+(|x)'],
+      exclude: ['**/node_modules/**/*', '**/tests/**/*'],
+      tsconfigDefaults: {
+        compilerOptions: {
+          declarationDir: './dist/types',
+          allowJs: true,
+          declaration: true,
+          skipLibCheck: true,
+          emitDeclarationOnly: true,
+        },
+        include: ['src'],
+        exclude: ['tests'],
+      },
+    }),
+  ],
 }
 
 /**