feat: Default for LeptosOptions, ConfFile (#2208)

Co-authored-by: chrisp60 <[email protected]>

leptos_config/src/lib.rs

@@ -13,7 +13,7 @@ use typed_builder::TypedBuilder;
 
 /// A Struct to allow us to parse LeptosOptions from the file. Not really needed, most interactions should
 /// occur with LeptosOptions
-#[derive(Clone, Debug, serde::Deserialize)]
+#[derive(Clone, Debug, serde::Deserialize, Default)]
 #[serde(rename_all = "kebab-case")]
 pub struct ConfFile {
     pub leptos_options: LeptosOptions,
@@ -27,7 +27,7 @@ pub struct ConfFile {
 #[serde(rename_all = "kebab-case")]
 pub struct LeptosOptions {
     /// The name of the WASM and JS files generated by wasm-bindgen. Defaults to the crate name with underscores instead of dashes
-    #[builder(setter(into))]
+    #[builder(setter(into), default=default_output_name())]
     pub output_name: String,
     /// The path of the all the files generated by cargo-leptos. This defaults to '.' for convenience when integrating with other
     /// tools.
@@ -112,6 +112,16 @@ impl LeptosOptions {
     }
 }
 
+impl Default for LeptosOptions {
+    fn default() -> Self {
+        LeptosOptions::builder().build()
+    }
+}
+
+fn default_output_name() -> String {
+    env!("CARGO_CRATE_NAME").replace('-', "_")
+}
+
 fn default_site_root() -> String {
     ".".to_string()
 }