diff --git a/example/web/README.md b/example/web/README.md
index 50fbc0bb6..e903d263a 100644
--- a/example/web/README.md
+++ b/example/web/README.md
@@ -6,7 +6,7 @@ You need a Unix shell with `sed`, `tar` and `wget` utilities to run the provided
 
 ## Building tdweb NPM package
 
-* Install the 2.0.6 [emsdk](https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html), which is known to work. Do not use the system-provided `emscripten` package, because it contains a too old emsdk version.
+* Install the 3.1.1 [emsdk](https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html), which is known to work. Do not use the system-provided `emscripten` package, because it contains a too old emsdk version.
 * Install all `TDLib` build dependencies described in [Building](https://github.com/tdlib/td#building) and `sed`, `tar` and `wget` utilities.
 * Run `source ./emsdk_env.sh` from `emsdk` directory to set up the correct build environment.
 * On `macOS`, install the `coreutils` [Homebrew](https://brew.sh) package and replace `realpath` in scripts with `grealpath`:
diff --git a/example/web/tdweb/src/worker.js b/example/web/tdweb/src/worker.js
index 363a96e15..abc087c44 100644
--- a/example/web/tdweb/src/worker.js
+++ b/example/web/tdweb/src/worker.js
@@ -73,6 +73,7 @@ async function loadTdlibWasm(onFS, wasmUrl) {
   let module = createTdwebModule({
     onRuntimeInitialized: () => {
       log.info('runtime intialized');
+      onFS(module.FS);
     },
     instantiateWasm: (imports, successCallback) => {
       log.info('start instantiateWasm', td_wasm, imports);
@@ -85,7 +86,6 @@ async function loadTdlibWasm(onFS, wasmUrl) {
     },
     ENVIROMENT: 'WORKER'
   });
-  onFS(module.FS); // hack
   log.info('Wait module');
   module = await module;
   log.info('Got module', module);
@@ -103,6 +103,7 @@ async function loadTdlibAsmjs(onFS) {
   let module = createTdwebModule({
     onRuntimeInitialized: () => {
       console.log('runtime intialized');
+      onFS(module.FS);
     },
     locateFile: name => {
       if (name === fromFile) {
@@ -112,7 +113,6 @@ async function loadTdlibAsmjs(onFS) {
     },
     ENVIROMENT: 'WORKER'
   });
-  onFS(module.FS); // hack
   log.info('Wait module');
   module = await module;
   log.info('Got module', module);
@@ -614,7 +614,11 @@ class TdClient {
     this.TdModule = await loadTdlib(mode, this.onFS, options.wasmUrl);
     log.info('got TdModule');
     this.td_functions = {
-      td_create: this.TdModule.cwrap('td_emscripten_create_client_id', 'number', []),
+      td_create: this.TdModule.cwrap(
+        'td_emscripten_create_client_id',
+        'number',
+        []
+      ),
       td_send: this.TdModule.cwrap('td_emscripten_send', null, [
         'number',
         'string'