fix attempted document access in web workers

README.md

@@ -51,6 +51,13 @@ document.addEventListener("libcurl_load", ()=>{
 });
 ```
 
+Alternatively, the `libcurl.onload` callback can be used.
+```js
+libcurl.onload = () => {
+  console.log("libcurl.js ready!");
+}
+```
+
 Once loaded, there will be a `window.libcurl` object which includes all the API functions. The `libcurl.ready` property can also be used to know if the WASM has loaded.
 
 ### Making HTTP Requests:

client/javascript/main.js

@@ -30,6 +30,7 @@ var event_loop = null;
 var active_requests = 0;
 var wasm_ready = false;
 var version_dict = null;
+var api = null;
 const libcurl_version = "__library_version__";
 
 function check_loaded(check_websocket) {
@@ -267,7 +268,7 @@ async function libcurl_fetch(url, params={}) {
 
 function set_websocket_url(url) {
   websocket_url = url;
-  if (!Module.websocket) {
+  if (!Module.websocket && ENVIRONMENT_IS_WEB) {
     document.addEventListener("libcurl_load", () => {
       set_websocket_url(url);
     });
@@ -292,8 +293,11 @@ function main() {
   _init_curl();
   set_websocket_url(websocket_url);
 
+  if (ENVIRONMENT_IS_WEB) {
     let load_event = new Event("libcurl_load");
     document.dispatchEvent(load_event);
+  }
+  api.onload();
 }
 
 function load_wasm(url) {
@@ -303,7 +307,7 @@ function load_wasm(url) {
 }
 
 Module.onRuntimeInitialized = main;
-return {
+api = {
   fetch: libcurl_fetch,
   set_websocket: set_websocket_url,
   load_wasm: load_wasm,
@@ -319,7 +323,11 @@ return {
   get stdout() {return out},
   set stdout(callback) {out = callback},
   get stderr() {return err},
-  set stderr(callback) {err = callback}
-}
+  set stderr(callback) {err = callback},
+
+  onload() {}
+};
+
+return api;
 
 })()

client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "libcurl.js",
-  "version": "0.3.8",
+  "version": "0.3.9",
   "description": "An experimental port of libcurl to WebAssembly for use in the browser.",
   "main": "libcurl.mjs",
   "scripts": {