improvement: git rid of cloning in the build_static_asset method.

app/src/asset.rs

@@ -4,35 +4,37 @@
 use mime_guess::from_path;
 use pavex::request::path::PathParams;
 use rust_embed_for_web::{EmbedableFile, RustEmbed};
+use std::borrow::Cow;
 
 // struct type to represent a static asset from the file system
 #[derive(RustEmbed)]
 #[folder = "../static"]
 struct Asset;
 
 #[PathParams]
-pub struct GetFilenameParams {
-    filename: String,
+pub struct GetFilenameParams<'a> {
+    filename: Cow<'a, str>,
 }
 
 // struct type to represent a static asset, CSS, JS, an image, or anything else
 #[derive(Debug, Clone)]
 pub struct StaticAsset {
-    pub name: String,
+    pub name: Cow<'static, str>,
     pub data: Vec<u8>,
-    pub mime_type: &'static str,
+    pub mime_type: Cow<'static, str>,
 }
 
 // methods for the StaticAsset type
 impl StaticAsset {
     pub fn build_static_asset(params: PathParams<GetFilenameParams>) -> Self {
         let file = params.0.filename;
         Self {
-            name: file.clone(),
+            name: Cow::Owned(file.to_string()),
             data: Asset::get(&file).unwrap().data(),
-            mime_type: from_path(&file)
+            mime_type: from_path(file.as_ref()) 
                 .first_raw()
-                .unwrap_or("application/octet-stream"),
+                .map(|s| Cow::Owned(s.to_string()))
+                .unwrap_or_else(|| Cow::Borrowed("application/octet-stream")),
         }
     }
 }

app/src/routes/static_assets.rs

@@ -14,7 +14,7 @@ impl TypedBody for StaticAsset {
     type Body = Full<Bytes>;
 
     fn content_type(&self) -> HeaderValue {
-        HeaderValue::from_static(self.mime_type)
+         HeaderValue::from_str(&self.mime_type).unwrap()
     }
 
     fn body(self) -> Self::Body {

static/script.js

@@ -1,3 +1,8 @@
-'use strict';
+"use strict";
 
-console.log("Hello, from JavaScript");
+console.log("Hello, from JavaScript");
+
+let date = new Date();
+let year = date.getFullYear();
+
+console.log(`It is: ${year}`);