fix(typescript): Remove the usages of private members (#10037)

**Related issue:**

 - Closes #10034

Author: CPunisher

Diff for: .changeset/strange-eggs-jump.md

@@ -0,0 +1,6 @@
+---
+swc_core: patch
+swc_typescript: patch
+---
+
+fix(typescript): Remove the usage of private members

Diff for: crates/swc_typescript/src/fast_dts/class.rs

@@ -229,6 +229,18 @@ impl FastDts {
                         continue;
                     }
 
+                    if auto_accessor
+                        .accessibility
+                        .is_some_and(|accessibility| accessibility == Accessibility::Private)
+                    {
+                        auto_accessor.decorators.clear();
+                        auto_accessor.definite = false;
+                        auto_accessor.type_ann = None;
+                        auto_accessor.accessibility =
+                            self.transform_accessibility(auto_accessor.accessibility);
+                    }
+
+                    auto_accessor.is_override = false;
                     auto_accessor.value = None;
                     class.body.push(member);
                 }

Diff for: crates/swc_typescript/src/fast_dts/visitors/type_usage.rs

@@ -6,9 +6,9 @@ use petgraph::{
 use rustc_hash::{FxHashMap, FxHashSet};
 use swc_common::{BytePos, Spanned, SyntaxContext};
 use swc_ecma_ast::{
-    Class, ClassMember, Decl, ExportDecl, ExportDefaultDecl, ExportDefaultExpr, Function, Id,
-    Ident, ModuleExportName, ModuleItem, NamedExport, TsEntityName, TsExportAssignment,
-    TsExprWithTypeArgs, TsPropertySignature, TsTypeElement,
+    Accessibility, Class, ClassMember, Decl, ExportDecl, ExportDefaultDecl, ExportDefaultExpr,
+    Function, Id, Ident, ModuleExportName, ModuleItem, NamedExport, TsEntityName,
+    TsExportAssignment, TsExprWithTypeArgs, TsPropertySignature, TsTypeElement,
 };
 use swc_ecma_visit::{Visit, VisitWith};
 
@@ -251,6 +251,34 @@ impl Visit for TypeUsageAnalyzer<'_> {
         if self.has_internal_annotation(node.span_lo()) {
             return;
         }
+
+        let is_private = match node {
+            ClassMember::Constructor(constructor) => constructor
+                .accessibility
+                .is_some_and(|accessibility| accessibility == Accessibility::Private),
+            ClassMember::Method(class_method) => class_method
+                .accessibility
+                .is_some_and(|accessibility| accessibility == Accessibility::Private),
+            ClassMember::PrivateMethod(_) => true,
+            ClassMember::ClassProp(class_prop) => class_prop
+                .accessibility
+                .is_some_and(|accessibility| accessibility == Accessibility::Private),
+            ClassMember::PrivateProp(_) => true,
+            ClassMember::TsIndexSignature(_) => false,
+            ClassMember::Empty(_) => false,
+            ClassMember::StaticBlock(_) => false,
+            ClassMember::AutoAccessor(auto_accessor) => {
+                auto_accessor
+                    .accessibility
+                    .is_some_and(|accessibility| accessibility == Accessibility::Private)
+                    || auto_accessor.key.is_private()
+            }
+        };
+
+        if is_private {
+            return;
+        }
+
         node.visit_children_with(self);
     }
 

Diff for: crates/swc_typescript/tests/fixture/issues/10034.snap

@@ -0,0 +1,8 @@
+```==================== .D.TS ====================
+
+export declare class SomeClass {
+    private func;
+    private func2;
+}
+
+

Diff for: crates/swc_typescript/tests/fixture/issues/10034.ts

@@ -0,0 +1,18 @@
+const A_SYMBOL = Symbol("A_SYMBOL");
+const func = () => null;
+
+export class SomeClass {
+    private func(
+        queryFingerprint: string,
+        onStale: () => void
+    ): null | typeof A_SYMBOL {
+        return null;
+    }
+
+    private func2(
+        queryFingerprint: string,
+        onStale: () => void
+    ): null | typeof func {
+        return null;
+    }
+}

Diff for: crates/swc_typescript/tests/fixture/private-accessibility.snap

@@ -0,0 +1,17 @@
+```==================== .D.TS ====================
+
+export declare class A {
+    private p1;
+    private constructor();
+    private accessor myProperty;
+    private func1;
+}
+export declare class B {
+    private a;
+    private constructor();
+}
+export declare class C {
+    #private;
+}
+
+

Diff for: crates/swc_typescript/tests/fixture/private-accessibility.ts

@@ -0,0 +1,20 @@
+const A_SYMBOL = Symbol("A_SYMBOL");
+
+export class A {
+    private p1: typeof A_SYMBOL;
+    private constructor(a: typeof A_SYMBOL) {}
+    private accessor myProperty: typeof A_SYMBOL;
+    private func1(a: typeof A_SYMBOL): typeof A_SYMBOL | null {
+        return null;
+    }
+}
+
+export class B {
+    private constructor(private a: typeof A_SYMBOL) {}
+}
+
+export class C {
+    #p1: typeof A_SYMBOL;
+    accessor #myProperty: typeof A_SYMBOL;
+    #f(a: typeof A_SYMBOL) {}
+}