diff --git a/crates/backend/src/ast.rs b/crates/backend/src/ast.rs
index 6e1be828..f82d7e3e 100644
--- a/crates/backend/src/ast.rs
+++ b/crates/backend/src/ast.rs
@@ -23,6 +23,9 @@ pub struct NapiFn {
   pub skip_typescript: bool,
   pub comments: Vec<String>,
   pub parent_is_generator: bool,
+  pub writable: bool,
+  pub enumerable: bool,
+  pub configurable: bool,
 }
 
 #[derive(Debug, Clone)]
@@ -94,6 +97,9 @@ pub struct NapiStructField {
   pub ty: syn::Type,
   pub getter: bool,
   pub setter: bool,
+  pub writable: bool,
+  pub enumerable: bool,
+  pub configurable: bool,
   pub comments: Vec<String>,
   pub skip_typescript: bool,
   pub ts_type: Option<String>,
diff --git a/crates/backend/src/codegen.rs b/crates/backend/src/codegen.rs
index 66c7f6ba..3cbfcda9 100644
--- a/crates/backend/src/codegen.rs
+++ b/crates/backend/src/codegen.rs
@@ -7,6 +7,11 @@ mod r#enum;
 mod r#fn;
 mod r#struct;
 
+pub const PROPERTY_ATTRIBUTE_DEFAULT: i32 = 0;
+pub const PROPERTY_ATTRIBUTE_WRITABLE: i32 = 1 << 0;
+pub const PROPERTY_ATTRIBUTE_ENUMERABLE: i32 = 1 << 1;
+pub const PROPERTY_ATTRIBUTE_CONFIGURABLE: i32 = 1 << 2;
+
 pub trait TryToTokens {
   fn try_to_tokens(&self, tokens: &mut TokenStream) -> BindgenResult<()>;
 
diff --git a/crates/backend/src/codegen/struct.rs b/crates/backend/src/codegen/struct.rs
index 9a63ca3d..38a82fe6 100644
--- a/crates/backend/src/codegen/struct.rs
+++ b/crates/backend/src/codegen/struct.rs
@@ -695,9 +695,21 @@ impl NapiStruct {
       }
 
       let js_name = &field.js_name;
+      let mut attribute = super::PROPERTY_ATTRIBUTE_DEFAULT;
+      if field.writable {
+        attribute |= super::PROPERTY_ATTRIBUTE_WRITABLE;
+      }
+      if field.enumerable {
+        attribute |= super::PROPERTY_ATTRIBUTE_ENUMERABLE;
+      }
+      if field.configurable {
+        attribute |= super::PROPERTY_ATTRIBUTE_CONFIGURABLE;
+      }
+
       let mut prop = quote! {
         napi::bindgen_prelude::Property::new(#js_name)
           .unwrap()
+          .with_property_attributes(napi::bindgen_prelude::PropertyAttributes::from_bits(#attribute).unwrap())
       };
 
       if field.getter {
@@ -705,7 +717,7 @@ impl NapiStruct {
         (quote! { .with_getter(#getter_name) }).to_tokens(&mut prop);
       }
 
-      if field.setter {
+      if field.writable && field.setter {
         let setter_name = Ident::new(&format!("set_{}", field_name), Span::call_site());
         (quote! { .with_setter(#setter_name) }).to_tokens(&mut prop);
       }
@@ -757,9 +769,20 @@ impl NapiImpl {
       let intermediate_name = get_intermediate_ident(&item_str);
       methods.push(item.try_to_token_stream()?);
 
+      let mut attribute = super::PROPERTY_ATTRIBUTE_DEFAULT;
+      if item.writable {
+        attribute |= super::PROPERTY_ATTRIBUTE_WRITABLE;
+      }
+      if item.enumerable {
+        attribute |= super::PROPERTY_ATTRIBUTE_ENUMERABLE;
+      }
+      if item.configurable {
+        attribute |= super::PROPERTY_ATTRIBUTE_CONFIGURABLE;
+      }
+
       let prop = props.entry(&item.js_name).or_insert_with(|| {
         quote! {
-          napi::bindgen_prelude::Property::new(#js_name).unwrap()
+          napi::bindgen_prelude::Property::new(#js_name).unwrap().with_property_attributes(napi::bindgen_prelude::PropertyAttributes::from_bits(#attribute).unwrap())
         }
       });
 
diff --git a/crates/macro/src/parser/attrs.rs b/crates/macro/src/parser/attrs.rs
index 54598ba1..3b3b0418 100644
--- a/crates/macro/src/parser/attrs.rs
+++ b/crates/macro/src/parser/attrs.rs
@@ -48,6 +48,9 @@ macro_rules! attrgen {
       (getter, Getter(Span, Option<Ident>)),
       (setter, Setter(Span, Option<Ident>)),
       (readonly, Readonly(Span)),
+      (enumerable, Enumerable(Span, Option<bool>)),
+      (writable, Writable(Span, Option<bool>)),
+      (configurable, Configurable(Span, Option<bool>)),
       (skip, Skip(Span)),
       (strict, Strict(Span)),
       (return_if_invalid, ReturnIfInvalid(Span)),
@@ -116,6 +119,22 @@ macro_rules! methods {
     }
   };
 
+  (@method $name:ident, $variant:ident(Span, Option<bool>)) => {
+    pub fn $name(&self) -> bool {
+      self.attrs
+        .iter()
+        .filter_map(|a| match &a.1 {
+          BindgenAttr::$variant(_, s) => {
+            a.0.set(true);
+            *s
+          }
+          _ => None,
+        })
+        .next()
+        .unwrap_or(true)
+    }
+  };
+
   (@method $name:ident, $variant:ident(Span, Vec<String>, Vec<Span>)) => {
     pub fn $name(&self) -> Option<(&[String], &[Span])> {
       self.attrs
diff --git a/crates/macro/src/parser/mod.rs b/crates/macro/src/parser/mod.rs
index 58f2ccd3..5450ff1b 100644
--- a/crates/macro/src/parser/mod.rs
+++ b/crates/macro/src/parser/mod.rs
@@ -111,6 +111,21 @@ impl Parse for BindgenAttr {
           return Ok(BindgenAttr::$variant(attr_span, val, span))
         });
 
+        (@parser $variant:ident(Span, Option<bool>)) => ({
+          if let Ok(_) = input.parse::<Token![=]>() {
+            let (val, _) = match input.parse::<syn::LitBool>() {
+              Ok(str) => (str.value(), str.span()),
+              Err(_) => {
+                let ident = input.parse::<AnyIdent>()?.0;
+                (true, ident.span())
+              }
+            };
+            return Ok::<BindgenAttr, syn::Error>(BindgenAttr::$variant(attr_span, Some(val)))
+          } else {
+            return Ok(BindgenAttr::$variant(attr_span, Some(true)))
+          }
+        });
+
         (@parser $variant:ident(Span, Vec<String>, Vec<Span>)) => ({
           input.parse::<Token![=]>()?;
           let (vals, spans) = match input.parse::<syn::ExprArray>() {
@@ -677,6 +692,9 @@ fn napi_fn_from_decl(
       ts_return_type: opts.ts_return_type().map(|(m, _)| m.to_owned()),
       skip_typescript: opts.skip_typescript().is_some(),
       parent_is_generator,
+      writable: opts.writable(),
+      enumerable: opts.enumerable(),
+      configurable: opts.configurable(),
     }
   })
 }
@@ -868,6 +886,9 @@ impl ConvertToAST for syn::ItemStruct {
 
       let ignored = field_opts.skip().is_some();
       let readonly = field_opts.readonly().is_some();
+      let writable = field_opts.writable();
+      let enumerable = field_opts.enumerable();
+      let configurable = field_opts.configurable();
       let skip_typescript = field_opts.skip_typescript().is_some();
       let ts_type = field_opts.ts_type().map(|e| e.0.to_string());
 
@@ -877,6 +898,9 @@ impl ConvertToAST for syn::ItemStruct {
         ty: field.ty.clone(),
         getter: !ignored,
         setter: !(ignored || readonly),
+        writable,
+        enumerable,
+        configurable,
         comments: extract_doc_comments(&field.attrs),
         skip_typescript,
         ts_type,
diff --git a/crates/napi/Cargo.toml b/crates/napi/Cargo.toml
index 3b508696..74160f43 100644
--- a/crates/napi/Cargo.toml
+++ b/crates/napi/Cargo.toml
@@ -51,6 +51,7 @@ tokio_time = ["tokio/time"]
 ctor = "0.1"
 once_cell = "1"
 thread_local = "1"
+bitflags = "1"
 
 [dependencies.napi-sys]
 version = "2.2.2"
diff --git a/crates/napi/src/js_values/object_property.rs b/crates/napi/src/js_values/object_property.rs
index 9e89d949..4a777694 100644
--- a/crates/napi/src/js_values/object_property.rs
+++ b/crates/napi/src/js_values/object_property.rs
@@ -2,6 +2,8 @@ use std::convert::From;
 use std::ffi::CString;
 use std::ptr;
 
+use bitflags::bitflags;
+
 use crate::{sys, Callback, NapiRaw, Result};
 
 #[derive(Clone)]
@@ -29,31 +31,25 @@ impl Default for Property {
   }
 }
 
-#[repr(i32)]
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub enum PropertyAttributes {
-  Default = sys::PropertyAttributes::default,
-  Writable = sys::PropertyAttributes::writable,
-  Enumerable = sys::PropertyAttributes::enumerable,
-  Configurable = sys::PropertyAttributes::configurable,
-  Static = sys::PropertyAttributes::static_,
+bitflags! {
+  pub struct PropertyAttributes: i32 {
+    const Default = sys::PropertyAttributes::default;
+    const Writable = sys::PropertyAttributes::writable;
+    const Enumerable = sys::PropertyAttributes::enumerable;
+    const Configurable = sys::PropertyAttributes::configurable;
+    const Static = sys::PropertyAttributes::static_;
+  }
 }
 
 impl Default for PropertyAttributes {
   fn default() -> Self {
-    PropertyAttributes::Default
+    PropertyAttributes::Configurable | PropertyAttributes::Enumerable | PropertyAttributes::Writable
   }
 }
 
 impl From<PropertyAttributes> for sys::napi_property_attributes {
   fn from(value: PropertyAttributes) -> Self {
-    match value {
-      PropertyAttributes::Default => sys::PropertyAttributes::default,
-      PropertyAttributes::Writable => sys::PropertyAttributes::writable,
-      PropertyAttributes::Enumerable => sys::PropertyAttributes::enumerable,
-      PropertyAttributes::Configurable => sys::PropertyAttributes::configurable,
-      PropertyAttributes::Static => sys::PropertyAttributes::static_,
-    }
+    value.bits()
   }
 }
 
diff --git a/crates/napi/src/lib.rs b/crates/napi/src/lib.rs
index 476096fc..7892567b 100644
--- a/crates/napi/src/lib.rs
+++ b/crates/napi/src/lib.rs
@@ -1,5 +1,6 @@
 #![deny(clippy::all)]
 #![forbid(unsafe_op_in_unsafe_fn)]
+#![allow(non_upper_case_globals)]
 
 //! High level Node.js [N-API](https://nodejs.org/api/n-api.html) binding
 //!
diff --git a/examples/napi/__test__/object-attr.spec.ts b/examples/napi/__test__/object-attr.spec.ts
new file mode 100644
index 00000000..81769ffe
--- /dev/null
+++ b/examples/napi/__test__/object-attr.spec.ts
@@ -0,0 +1,15 @@
+import test from 'ava'
+
+import { NotWritableClass } from '../index'
+
+test('Not Writable Class', (t) => {
+  const obj = new NotWritableClass('1')
+  t.throws(() => {
+    obj.name = '2'
+  })
+  obj.setName('2')
+  t.is(obj.name, '2')
+  t.throws(() => {
+    obj.setName = () => {}
+  })
+})
diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index 5e3dee5f..3ac6a9f6 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -277,6 +277,11 @@ Generated by [AVA](https://avajs.dev).
       static optionStartEnd(optional1: string | undefined | null, required: string, optional2?: string | undefined | null): string␊
       static optionOnly(optional?: string | undefined | null): string␊
     }␊
+    export class NotWritableClass {␊
+      name: string␊
+      constructor(name: string)␊
+      setName(name: string): void␊
+    }␊
     export class ClassWithFactory {␊
       name: string␊
       static withName(name: string): ClassWithFactory␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index 31385caf..197cd296 100644
Binary files a/examples/napi/__test__/typegen.spec.ts.snap and b/examples/napi/__test__/typegen.spec.ts.snap differ
diff --git a/examples/napi/__test__/values.spec.ts b/examples/napi/__test__/values.spec.ts
index 72dc4cd5..5465716b 100644
--- a/examples/napi/__test__/values.spec.ts
+++ b/examples/napi/__test__/values.spec.ts
@@ -162,6 +162,13 @@ test('class', (t) => {
   t.is(dog.kind, Kind.Dog)
   t.is(dog.whoami(), 'Dog: 旺财')
 
+  t.notThrows(() => {
+    const rawMethod = dog.whoami
+    dog.whoami = function (...args) {
+      return rawMethod.apply(this, args)
+    }
+  })
+
   dog.name = '可乐'
   t.is(dog.name, '可乐')
   t.deepEqual(dog.returnOtherClass(), new Dog('Doge'))
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index b2500499..4a0f1e55 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -267,6 +267,11 @@ export class Optional {
   static optionStartEnd(optional1: string | undefined | null, required: string, optional2?: string | undefined | null): string
   static optionOnly(optional?: string | undefined | null): string
 }
+export class NotWritableClass {
+  name: string
+  constructor(name: string)
+  setName(name: string): void
+}
 export class ClassWithFactory {
   name: string
   static withName(name: string): ClassWithFactory
diff --git a/examples/napi/src/class.rs b/examples/napi/src/class.rs
index e01fc00b..a1ae310c 100644
--- a/examples/napi/src/class.rs
+++ b/examples/napi/src/class.rs
@@ -347,3 +347,17 @@ pub fn receive_object_with_class_field(
 ) -> Result<ClassInstance<Bird>> {
   Ok(object.bird)
 }
+
+#[napi(constructor)]
+pub struct NotWritableClass {
+  #[napi(writable = false)]
+  pub name: String,
+}
+
+#[napi]
+impl NotWritableClass {
+  #[napi(writable = false)]
+  pub fn set_name(&mut self, name: String) {
+    self.name = name;
+  }
+}