Add __wbindgen_main to other backends

Author: daxpedda

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

@@ -415,6 +415,10 @@ impl<'a> Context<'a> {
                 if needs_manual_start {
                     footer.push_str("\nwasm.__wbindgen_start();\n");
                 }
+
+                if self.start_found {
+                    footer.push_str("\nwasm.__wbindgen_main();\n");
+                }
             }
 
             OutputMode::Deno => {
@@ -429,6 +433,10 @@ impl<'a> Context<'a> {
                 if needs_manual_start {
                     footer.push_str("\nwasm.__wbindgen_start();\n");
                 }
+
+                if self.start_found {
+                    footer.push_str("\nwasm.__wbindgen_main();\n");
+                }
             }
 
             // With Bundlers and modern ES6 support in Node we can simply import
@@ -463,6 +471,12 @@ impl<'a> Context<'a> {
                 if needs_manual_start {
                     start = Some("\nwasm.__wbindgen_start();\n".to_string());
                 }
+
+                if self.start_found {
+                    start
+                        .get_or_insert_with(String::default)
+                        .push_str("\nwasm.__wbindgen_main();\n");
+                }
             }
 
             // With a browser-native output we're generating an ES module, but
@@ -909,7 +923,7 @@ impl<'a> Context<'a> {
             } else {
                 ""
             },
-            main = if needs_manual_start && self.start_found {
+            main = if self.start_found {
                 "if (start == true) { wasm.__wbindgen_main(); }"
             } else {
                 ""