Webassembly gha test.

Add GHA test target wasm32-unknown-unknown.
Switch from `use std::*` to qualified `std::` calls.

.github/workflows/rust.yml

@@ -50,3 +50,16 @@ jobs:
         run: cargo build --locked --all-targets --verbose
       - name: Run tests
         run: cargo test --locked --all-targets --verbose
+
+  build-and-test-wasm:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@1d96c772d19495a3b5c517cd2bc0cb401ea0529f
+      - name: Report cargo version
+        run: cargo --version
+      - name: Report rustc version
+        run: rustc --version
+      - name: Build
+        run: cargo build --locked --target wasm32-unknown-unknown --verbose
+      - name: Run tests
+        run: cargo test --locked --target wasm32-unknown-unknown --verbose

src/lib.rs

@@ -20,9 +20,6 @@
 //! }
 //! ```
 
-use std::env;
-use std::path::PathBuf;
-
 #[cfg(unix)]
 /// Returns the path of the current user’s home directory if known.
 ///
@@ -39,27 +36,27 @@ use std::path::PathBuf;
 ///
 /// This function returns `None` when the environment variable is set but empty.
 /// Those implementations return the empty string `""` instead.
-pub fn env_home_dir() -> Option<PathBuf> {
-    let home = env::var("HOME");
+pub fn env_home_dir() -> Option<std::path::PathBuf> {
+    let home = std::env::var("HOME");
     match home {
-        Ok(val) if !val.is_empty() => Some(PathBuf::from(val)),
+        Ok(val) if !val.is_empty() => Some(std::path::PathBuf::from(val)),
         _ => None,
     }
 }
 
 #[cfg(windows)]
 /// Returns the path of the current user’s home directory if known.
-pub fn env_home_dir() -> Option<PathBuf> {
-    let home = env::var("USERPROFILE");
+pub fn env_home_dir() -> Option<std::path::PathBuf> {
+    let home = std::env::var("USERPROFILE");
     match home {
-        Ok(val) if !val.is_empty() => Some(PathBuf::from(val)),
+        Ok(val) if !val.is_empty() => Some(std::path::PathBuf::from(val)),
         _ => None,
     }
 }
 
 #[cfg(all(not(windows), not(unix)))]
 /// Returns the path of the current user’s home directory if known.
-pub fn env_home_dir() -> Option<PathBuf> {
+pub fn env_home_dir() -> Option<std::path::PathBuf> {
     None
 }