diff --git a/apps/node-ts/package.json b/apps/node-ts/package.json
index e75ac6a..294ca59 100644
--- a/apps/node-ts/package.json
+++ b/apps/node-ts/package.json
@@ -24,6 +24,7 @@
     "@ffmpeg/libav": "^0.0.1-alpha.0",
     "@ffmpeg/libav-core": "^0.0.1-alpha.1",
     "@ffmpeg/libav-core-mt": "^0.0.1-alpha.1",
+    "@types/ffmpeg__libav-core": "^0.0.0",
     "ts-node": "^10.9.1"
   }
 }
diff --git a/package-lock.json b/package-lock.json
index 8088dbd..7c40012 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,6 +29,7 @@
         "@ffmpeg/libav": "^0.0.1-alpha.0",
         "@ffmpeg/libav-core": "^0.0.1-alpha.1",
         "@ffmpeg/libav-core-mt": "^0.0.1-alpha.1",
+        "@types/ffmpeg__libav-core": "^0.0.0",
         "ts-node": "^10.9.1"
       }
     },
@@ -2191,6 +2192,11 @@
       "resolved": "https://registry.npmjs.org/@tsconfig/node16/-/node16-1.0.3.tgz",
       "integrity": "sha512-yOlFc+7UtL/89t2ZhjPvvB/DeAr3r+Dq58IgzsFkOAvVC6NMJXmCGjbptdXdR9qsX7pKcTL+s87FtYREi2dEEQ=="
     },
+    "node_modules/@types/ffmpeg__libav-core": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/@types/ffmpeg__libav-core/-/ffmpeg__libav-core-0.0.0.tgz",
+      "integrity": "sha512-n4UJAwyTUUms4EwHVLYagD+RgAd1Y65dLpoTxuK1VI4Aoi4X/EuJDCo1P+Qk96dUeFoWx/Rhj7Y9N90CI5g1Dg=="
+    },
     "node_modules/@types/json-schema": {
       "version": "7.0.11",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.11.tgz",
@@ -9201,6 +9207,7 @@
       "version": "0.0.1-alpha.0",
       "license": "MIT",
       "dependencies": {
+        "@types/ffmpeg__libav-core": "^0.0.0",
         "@types/node": "^18.7.8"
       },
       "devDependencies": {
@@ -9216,7 +9223,10 @@
     "packages/libav-core-mt": {
       "name": "@ffmpeg/libav-core-mt",
       "version": "0.0.1-alpha.1",
-      "license": "MIT"
+      "license": "MIT",
+      "dependencies": {
+        "@types/ffmpeg__libav-core": "^0.0.0"
+      }
     },
     "packages/libav-type": {
       "version": "0.0.1-alpha.0",
@@ -9586,6 +9596,7 @@
     "@ffmpeg/libav": {
       "version": "file:packages/libav",
       "requires": {
+        "@types/ffmpeg__libav-core": "^0.0.0",
         "@types/node": "^18.7.8",
         "rimraf": "^3.0.2",
         "typescript": "^4.8.2"
@@ -9595,7 +9606,10 @@
       "version": "file:packages/libav-core"
     },
     "@ffmpeg/libav-core-mt": {
-      "version": "file:packages/libav-core-mt"
+      "version": "file:packages/libav-core-mt",
+      "requires": {
+        "@types/ffmpeg__libav-core": "*"
+      }
     },
     "@gar/promisify": {
       "version": "1.1.3",
@@ -11014,6 +11028,11 @@
       "resolved": "https://registry.npmjs.org/@tsconfig/node16/-/node16-1.0.3.tgz",
       "integrity": "sha512-yOlFc+7UtL/89t2ZhjPvvB/DeAr3r+Dq58IgzsFkOAvVC6NMJXmCGjbptdXdR9qsX7pKcTL+s87FtYREi2dEEQ=="
     },
+    "@types/ffmpeg__libav-core": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/@types/ffmpeg__libav-core/-/ffmpeg__libav-core-0.0.0.tgz",
+      "integrity": "sha512-n4UJAwyTUUms4EwHVLYagD+RgAd1Y65dLpoTxuK1VI4Aoi4X/EuJDCo1P+Qk96dUeFoWx/Rhj7Y9N90CI5g1Dg=="
+    },
     "@types/json-schema": {
       "version": "7.0.11",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.11.tgz",
@@ -14122,6 +14141,7 @@
         "@ffmpeg/libav": "^0.0.1-alpha.0",
         "@ffmpeg/libav-core": "^0.0.1-alpha.1",
         "@ffmpeg/libav-core-mt": "^0.0.1-alpha.1",
+        "@types/ffmpeg__libav-core": "^0.0.0",
         "ts-node": "^10.9.1"
       }
     },
diff --git a/packages/libav-core-mt/package.json b/packages/libav-core-mt/package.json
index 1040526..4534038 100644
--- a/packages/libav-core-mt/package.json
+++ b/packages/libav-core-mt/package.json
@@ -3,6 +3,7 @@
   "version": "0.0.1-alpha.1",
   "description": "libav WebAssembly port",
   "main": "dist/libav-core.js",
+  "types": "dist/index.d.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -24,5 +25,8 @@
   "homepage": "https://github.com/ffmpegwasm/libav.wasm#readme",
   "publishConfig": {
     "access": "public"
+  },
+  "dependencies": {
+    "@types/ffmpeg__libav-core": "^0.0.0"
   }
 }
diff --git a/packages/libav/package.json b/packages/libav/package.json
index 24a51dc..288c813 100644
--- a/packages/libav/package.json
+++ b/packages/libav/package.json
@@ -30,6 +30,7 @@
     "access": "public"
   },
   "dependencies": {
+    "@types/ffmpeg__libav-core": "^0.0.0",
     "@types/node": "^18.7.8"
   },
   "devDependencies": {
diff --git a/packages/libav/src/libav.ts b/packages/libav/src/libav.ts
index 18ec2dd..289d4d9 100644
--- a/packages/libav/src/libav.ts
+++ b/packages/libav/src/libav.ts
@@ -1,12 +1,14 @@
-import { LibavCore } from "../../libav-type/index.d";
+import LibavCoreFactory from "ffmpeg__libav-core";
 
-let libav: LibavCore;
+type Libav = Awaited<ReturnType<typeof LibavCoreFactory>>;
 
-export const initLibav = (_libav: LibavCore) => {
+let libav: Libav;
+
+export const initLibav = (_libav: Libav) => {
   libav = _libav;
 };
 
-export const getLibav = () => {
+export const getLibav = (): Libav => {
   if (!libav) {
     console.error(
       "libav is not initialized, initLibav() should be called first!"
diff --git a/packages/libav/src/open-media.ts b/packages/libav/src/open-media.ts
index d8cfa18..30b78e8 100644
--- a/packages/libav/src/open-media.ts
+++ b/packages/libav/src/open-media.ts
@@ -4,13 +4,21 @@ import { getLibav } from "./libav";
 export function openMedia(filename: string): IAVFormatContenxt | null {
   const {
     NULL,
+    // @ts-ignore
     _avformat_alloc_context,
+    // @ts-ignore
     _avformat_open_input,
+    // @ts-ignore
     _avformat_find_stream_info,
+    // @ts-ignore
     ref,
+    // @ts-ignore
     deref,
+    // @ts-ignore
     stringToPtr,
+    // @ts-ignore
     _free,
+    // @ts-ignore
     AVFormatContext,
   } = getLibav();