Partial revert

crates/swc_ecma_transforms_optimization/tests/__swc_snapshots__/tests/simplify_dce.rs/issue_1150_1.js

@@ -1,5 +1,5 @@
 class A {
-    constructor(o = {}){
+    constructor(o: AOptions = {}){
         const { a = defaultA, c } = o;
         this.#a = a;
         this.#c = c;

crates/swc_ecma_transforms_optimization/tests/dce-jsx/property/input.js

@@ -0,0 +1,7 @@
+function A() {
+    return "a";
+}
+const b = "b";
+export function c() {
+    return <A.b />;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/property/output.js

@@ -0,0 +1,6 @@
+function A() {
+    return "a";
+}
+export function c() {
+    return <A.b />;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/property2/input.js

@@ -0,0 +1,8 @@
+function A() {
+    return "a";
+}
+const b = "b";
+const c = "c";
+export function d() {
+    return <A.b.c />;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/property2/output.js

@@ -0,0 +1,6 @@
+function A() {
+    return "a";
+}
+export function d() {
+    return <A.b.c />;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/spread/input.js

@@ -0,0 +1,8 @@
+function A() {
+    return "a";
+}
+const b = "b";
+const c = "c";
+export function d() {
+    return <A {...b}>{c}</A>;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/spread/output.js

@@ -0,0 +1,8 @@
+function A() {
+    return "a";
+}
+const b = "b";
+const c = "c";
+export function d() {
+    return <A {...b}>{c}</A>;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/var/input.js

@@ -0,0 +1,8 @@
+function A() {
+    return "a";
+}
+const b = "b";
+const c = "c";
+export function d() {
+    return <A val={b}>{c}</A>;
+}

crates/swc_ecma_transforms_optimization/tests/dce-jsx/var/output.js

@@ -0,0 +1,8 @@
+function A() {
+    return "a";
+}
+const b = "b";
+const c = "c";
+export function d() {
+    return <A val={b}>{c}</A>;
+}

crates/swc_ecma_transforms_optimization/tests/fixture.rs

@@ -54,6 +54,23 @@ fn dce_repeated(input: PathBuf) {
     );
 }
 
+#[testing::fixture("tests/dce-jsx/**/input.js")]
+fn dce_jsx(input: PathBuf) {
+    let output = input.with_file_name("output.js");
+
+    test_fixture(
+        Syntax::Es(EsSyntax {
+            decorators: true,
+            jsx: true,
+            ..Default::default()
+        }),
+        &|t| chain!(remover(t), dce(Default::default(), Mark::new())),
+        &input,
+        &output,
+        Default::default(),
+    );
+}
+
 #[testing::fixture("tests/expr-simplifier/**/input.js")]
 fn expr(input: PathBuf) {
     let output = input.with_file_name("output.js");

crates/swc_ecma_usage_analyzer/src/analyzer/mod.rs

@@ -896,6 +896,24 @@ where
         self.declare_decl(&n.local, true, None, false);
     }
 
+    #[cfg_attr(feature = "debug", tracing::instrument(skip_all))]
+    fn visit_jsx_element_name(&mut self, n: &JSXElementName) {
+        let ctx = Ctx {
+            in_pat_of_var_decl: false,
+            in_pat_of_param: false,
+            in_catch_param: false,
+            var_decl_kind_of_pat: None,
+            in_pat_of_var_decl_with_init: false,
+            ..self.ctx
+        };
+
+        n.visit_children_with(&mut *self.with_ctx(ctx));
+
+        if let JSXElementName::Ident(i) = n {
+            self.with_ctx(ctx).report_usage(i);
+        }
+    }
+
     #[cfg_attr(feature = "debug", tracing::instrument(skip(self, e)))]
     fn visit_member_expr(&mut self, e: &MemberExpr) {
         {