init repo

src/lib.rs

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+use wasm_bindgen::prelude::*;
+use web_sys::console;
+
+
+// When the `wee_alloc` feature is enabled, this uses `wee_alloc` as the global
+// allocator.
+//
+// If you don't want to use `wee_alloc`, you can safely delete this.
+#[cfg(feature = "wee_alloc")]
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
+
+// This is like the `main` function, except for JavaScript.
+#[wasm_bindgen(start)]
+pub fn main_js() -> Result<(), JsValue> {
+    // This provides better error messages in debug mode.
+    // It's disabled in release mode so it doesn't bloat up the file size.
+    #[cfg(debug_assertions)]
+    console_error_panic_hook::set_once();
+
+
+    // Your code goes here!
+    console::log_1(&JsValue::from_str("Hello world!"));
+
+    Ok(())
+}