Create target/static before compiling

build.rs

@@ -0,0 +1,40 @@
+use std::{
+    fs,
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+const STATIC_DIR: &str = "static";
+const STATIC_OUT_DIR: &str = "target/static";
+
+fn copy_recursively(path: &Path) {
+    let from = PathBuf::new().join(STATIC_DIR).join(path);
+    let to = PathBuf::new().join(STATIC_OUT_DIR).join(path);
+
+    println!("cargo:rerun-if-changed={}", from.display());
+
+    if from.is_file() {
+        if from.extension() == Some("ts".as_ref()) {
+            return;
+        }
+        fs::create_dir_all(to.parent().unwrap()).unwrap();
+        fs::copy(from, to).unwrap();
+    } else if from.is_dir() {
+        for entry in from.read_dir().unwrap() {
+            copy_recursively(&path.join(entry.unwrap().file_name()));
+        }
+    } else {
+        panic!("Unexpected file type at {}", from.display());
+    }
+}
+
+fn main() {
+    // Since remove_dir_all fails if the directory doesn't exist, we ensure it
+    // exists before deleting it. This way, we can use the remove_dir_all Result
+    // to ensure the directory was deleted successfully.
+    fs::create_dir_all(STATIC_OUT_DIR).unwrap();
+    fs::remove_dir_all(STATIC_OUT_DIR).unwrap();
+
+    Command::new("tsc").output().unwrap();
+    copy_recursively("".as_ref());
+}