diff --git a/crates/swc_ecma_parser/src/error.rs b/crates/swc_ecma_parser/src/error.rs
index cf6f8d655f3c..c61d04b0ab73 100644
--- a/crates/swc_ecma_parser/src/error.rs
+++ b/crates/swc_ecma_parser/src/error.rs
@@ -279,6 +279,7 @@ pub enum SyntaxError {
     TS2703,
     TS4112,
     TS8038,
+    TS18010,
     TSTypeAnnotationAfterAssign,
     TsNonNullAssertionNotAllowed(JsWord),
 
@@ -720,6 +721,9 @@ impl SyntaxError {
             SyntaxError::TS8038 => "Decorators may not appear after `export` or `export default` \
                                     if they also appear before `export`."
                 .into(),
+            SyntaxError::TS18010 => {
+                "An accessibility modifier cannot be used with a private identifier.".into()
+            }
             SyntaxError::TSTypeAnnotationAfterAssign => {
                 "Type annotations must come before default assignments".into()
             }
diff --git a/crates/swc_ecma_parser/src/parser/class_and_fn.rs b/crates/swc_ecma_parser/src/parser/class_and_fn.rs
index 9962b6ac77d5..fce10ad3e4f5 100644
--- a/crates/swc_ecma_parser/src/parser/class_and_fn.rs
+++ b/crates/swc_ecma_parser/src/parser/class_and_fn.rs
@@ -1097,20 +1097,27 @@ impl<I: Tokens> Parser<I> {
             }
 
             Ok(match key {
-                Key::Private(key) => PrivateProp {
-                    span: span!(p, start),
-                    key,
-                    value,
-                    is_static,
-                    decorators,
-                    accessibility,
-                    is_optional,
-                    is_override,
-                    readonly,
-                    type_ann,
-                    definite,
+                Key::Private(key) => {
+                    let span = span!(p, start);
+                    if accessibility.is_some() {
+                        p.emit_err(span.with_hi(key.span_hi()), SyntaxError::TS18010);
+                    }
+
+                    PrivateProp {
+                        span: span!(p, start),
+                        key,
+                        value,
+                        is_static,
+                        decorators,
+                        accessibility,
+                        is_optional,
+                        is_override,
+                        readonly,
+                        type_ann,
+                        definite,
+                    }
+                    .into()
                 }
-                .into(),
                 Key::Public(key) => {
                     let span = span!(p, start);
                     if is_abstract && value.is_some() {
@@ -1446,20 +1453,27 @@ impl<I: Tokens> Parser<I> {
         }
 
         match key {
-            Key::Private(key) => Ok(PrivateMethod {
-                span: span!(self, start),
+            Key::Private(key) => {
+                let span = span!(self, start);
+                if accessibility.is_some() {
+                    self.emit_err(span.with_hi(key.span_hi()), SyntaxError::TS18010);
+                }
 
-                accessibility,
-                is_abstract,
-                is_optional,
-                is_override,
+                Ok(PrivateMethod {
+                    span,
 
-                is_static,
-                key,
-                function,
-                kind,
+                    accessibility,
+                    is_abstract,
+                    is_optional,
+                    is_override,
+
+                    is_static,
+                    key,
+                    function,
+                    kind,
+                }
+                .into())
             }
-            .into()),
             Key::Public(key) => {
                 let span = span!(self, start);
                 if is_abstract && function.body.is_some() {
diff --git a/crates/swc_ecma_parser/tests/errors/issue-8687/input.ts b/crates/swc_ecma_parser/tests/errors/issue-8687/input.ts
new file mode 100644
index 000000000000..3e8eacea5842
--- /dev/null
+++ b/crates/swc_ecma_parser/tests/errors/issue-8687/input.ts
@@ -0,0 +1,4 @@
+class Foo {
+    private #p1() { }
+    private #p2: number;
+}
\ No newline at end of file
diff --git a/crates/swc_ecma_parser/tests/errors/issue-8687/input.ts.swc-stderr b/crates/swc_ecma_parser/tests/errors/issue-8687/input.ts.swc-stderr
new file mode 100644
index 000000000000..d74069efea60
--- /dev/null
+++ b/crates/swc_ecma_parser/tests/errors/issue-8687/input.ts.swc-stderr
@@ -0,0 +1,16 @@
+
+  x An accessibility modifier cannot be used with a private identifier.
+   ,-[$DIR/tests/errors/issue-8687/input.ts:1:1]
+ 1 | class Foo {
+ 2 |     private #p1() { }
+   :     ^^^^^^^^^^^
+ 3 |     private #p2: number;
+   `----
+
+  x An accessibility modifier cannot be used with a private identifier.
+   ,-[$DIR/tests/errors/issue-8687/input.ts:2:1]
+ 2 |     private #p1() { }
+ 3 |     private #p2: number;
+   :     ^^^^^^^^^^^
+ 4 | }
+   `----
diff --git a/crates/swc_ecma_transforms_typescript/src/strip_type.rs b/crates/swc_ecma_transforms_typescript/src/strip_type.rs
index 1680a866a293..2cc2db1cafce 100644
--- a/crates/swc_ecma_transforms_typescript/src/strip_type.rs
+++ b/crates/swc_ecma_transforms_typescript/src/strip_type.rs
@@ -89,6 +89,14 @@ impl VisitMut for StripType {
         prop.visit_mut_children_with(self);
     }
 
+    fn visit_mut_private_method(&mut self, n: &mut PrivateMethod) {
+        n.accessibility = None;
+        n.is_abstract = false;
+        n.is_optional = false;
+        n.is_override = false;
+        n.visit_mut_children_with(self);
+    }
+
     fn visit_mut_constructor(&mut self, n: &mut Constructor) {
         n.accessibility = None;
         n.visit_mut_children_with(self);