Add TS type for init fn

crates/cli-support/src/js/mod.rs

@@ -311,6 +311,7 @@ impl<'a> Context<'a> {
     /// `--target no-modules`, `--target web`, or for bundlers. This is the very
     /// last step performed in `finalize`.
     fn finalize_js(&mut self, module_name: &str, needs_manual_start: bool) -> (String, String) {
+        let mut ts = self.typescript.clone();
         let mut js = String::new();
         if self.config.mode.no_modules() {
             js.push_str("(function() {\n");
@@ -327,6 +328,7 @@ impl<'a> Context<'a> {
                 js.push_str("const __exports = {};\n");
                 js.push_str("let wasm;\n");
                 init = self.gen_init(&module_name, needs_manual_start);
+                ts.push_str(Self::ts_for_init_fn());
                 self.footer.push_str(&format!(
                     "self.{} = Object.assign(init, __exports);\n",
                     global
@@ -367,6 +369,7 @@ impl<'a> Context<'a> {
                 js.push_str("const __exports = {};\n");
                 self.imports_post.push_str("let wasm;\n");
                 init = self.gen_init(&module_name, needs_manual_start);
+                ts.push_str(Self::ts_for_init_fn());
                 self.footer.push_str("export default init;\n");
             }
         }
@@ -394,7 +397,7 @@ impl<'a> Context<'a> {
             js = js.replace("\n\n\n", "\n\n");
         }
 
-        (js, self.typescript.clone())
+        (js, ts)
     }
 
     fn wire_up_initial_intrinsics(&mut self) -> Result<(), Error> {
@@ -842,6 +845,16 @@ impl<'a> Context<'a> {
         Ok(())
     }
 
+    fn ts_for_init_fn() -> &'static str {
+        "\n\
+        /**\n\
+        * @param {string} module_or_path\n\
+        * @returns {Promise<any>}\n\
+        */\n\
+        export function init(module_or_path: string): Promise<any>;
+        "
+    }
+
     fn gen_init(&mut self, module_name: &str, needs_manual_start: bool) -> String {
         let mem = self.module.memories.get(self.memory);
         let (init_memory1, init_memory2) = if mem.import.is_some() {
@@ -865,7 +878,7 @@ impl<'a> Context<'a> {
 
         format!(
             "\
-                function init(module_or_path, maybe_memory) {{
+                function init(module_or_path) {{
                     let result;
                     const imports = {{ './{module}': __exports }};
                     if (module_or_path instanceof URL || typeof module_or_path === 'string' || module_or_path instanceof Request) {{

crates/typescript-tests/run.sh

@@ -11,6 +11,13 @@ cargo run -p wasm-bindgen-cli --bin wasm-bindgen -- \
   --out-dir pkg \
   --typescript
 
+mkdir pkg/web
+cargo run -p wasm-bindgen-cli --bin wasm-bindgen -- \
+  ../../target/wasm32-unknown-unknown/debug/typescript_tests.wasm \
+  --out-dir pkg/web \
+  --target web \
+  --typescript
+
 if [ ! -d node_modules ]; then
   npm install
 fi

crates/typescript-tests/src/web/init.ts

@@ -0,0 +1,3 @@
+import * as wbg from '../../pkg/web/typescript_tests';
+
+const init: Promise<any> = wbg.init('.');

crates/typescript-tests/tsconfig.json

@@ -9,6 +9,6 @@
         "baseUrl": "."
     },
     "include": [
-        "src/*.ts"
+        "src/**/*.ts"
     ]
 }