[IMP] tooling: add another d.ts file

package.json

@@ -5,7 +5,7 @@
   "main": "dist/owl.cjs.js",
   "browser": "dist/owl.iife.js",
   "module": "dist/owl.es.js",
-  "types": "dist/types/index.d.ts",
+  "types": "dist/types/owl.d.ts",
   "files": [
     "dist"
   ],
@@ -55,6 +55,7 @@
     "npm-run-all": "^4.1.5",
     "prettier": "2.4.1",
     "rollup": "^2.56.3",
+    "rollup-plugin-dts": "^4.2.2",
     "rollup-plugin-terser": "^7.0.2",
     "rollup-plugin-typescript2": "^0.31.1",
     "sass": "^1.16.1",

rollup.config.js

@@ -2,7 +2,7 @@ import pkg from "./package.json";
 import git from "git-rev-sync";
 import typescript from 'rollup-plugin-typescript2';
 import { terser } from "rollup-plugin-terser";
-
+import dts from "rollup-plugin-dts";
 
 let input, output;
 
@@ -68,12 +68,19 @@ function getConfigForFormat(format, generatedFileName, outro, minified = false)
   };
 }
 
-export default {
+export default [
-  input,
+  {
-  output,
+    input,
-  plugins: [
+    output,
-    typescript({
+    plugins: [
-      useTsconfigDeclarationDir: true
+      typescript({
-    }),
+        useTsconfigDeclarationDir: true
-  ]
+      }),
-};
+    ]
+  },
+  {
+    input: "dist/types/index.d.ts",
+    output: [{ file: "dist/types/owl.d.ts", format: "es" }],
+    plugins: [dts()],
+  },
+];