cli: Compile parsers to wasm using wasi-sdk, not emscripten (#4393)

* Build wasm modules using wasi-sdk, not emscripten

* Log a warning if --docker is passed

cli/src/main.rs

@@ -138,8 +138,7 @@ struct Build {
     /// Build a WASM module instead of a dynamic library
     #[arg(short, long)]
     pub wasm: bool,
-    /// Run emscripten via docker even if it is installed locally (only if building a WASM module
-    /// with --wasm)
+    /// No longer used.
     #[arg(short, long)]
     pub docker: bool,
     /// The path to output the compiled file
@@ -792,6 +791,10 @@ impl Build {
     fn run(self, mut loader: loader::Loader, current_dir: &Path) -> Result<()> {
         let grammar_path = current_dir.join(self.path.as_deref().unwrap_or_default());
 
+        if self.docker {
+            eprintln!("Warning: --docker flag is no longer used, and will be removed in a future release.");
+        }
+
         if self.wasm {
             let output_path = self.output.map(|path| current_dir.join(path));
             let root_path = get_root_path(&grammar_path.join("tree-sitter.json"))?;
@@ -801,7 +804,6 @@ impl Build {
                 &grammar_path,
                 current_dir,
                 output_path,
-                self.docker,
             )?;
         } else {
             let output_path = if let Some(ref path) = self.output {

cli/src/wasm.rs

@@ -44,7 +44,6 @@ pub fn compile_language_to_wasm(
     language_dir: &Path,
     output_dir: &Path,
     output_file: Option<PathBuf>,
-    force_docker: bool,
 ) -> Result<()> {
     let grammar_name = get_grammar_name(language_dir)?;
     let output_filename =
@@ -59,7 +58,6 @@ pub fn compile_language_to_wasm(
             .as_ref()
             .and_then(|p| Some(Path::new(p.file_name()?))),
         &output_filename,
-        force_docker,
     )?;
 
     // Exit with an error if the external scanner uses symbols from the