diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index cb368c0b..7fd43bb2 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -61,7 +61,7 @@ jobs:
         run: cargo fmt -- --check
 
       - name: Clippy
-        run: cargo clippy
+        run: cargo clippy --all-features
 
       - name: Clear the cargo caches
         run: |
diff --git a/README.md b/README.md
index c6d4a5b6..0398a0b4 100644
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ yarn test
 | T: Fn(...) -> Result<T> | Function               | 1                                                                               | v8.0.0               |
 | Async/Future            | Promise<T>             | 4                                                                               | v10.6.0              | async                    |
 | AsyncTask               | Promise<T>             | 1                                                                               | v8.5.0               |
-| (NOT YET)               | global                 | 1                                                                               | v8.0.0               |
+| JsGlobal                | global                 | 1                                                                               | v8.0.0               |
 | JsSymbol                | Symbol                 | 1                                                                               | v8.0.0               |
 | (NOT YET)               | ArrayBuffer/TypedArray | 1                                                                               | v8.0.0               |
 | JsFunction              | threadsafe function    | 4                                                                               | v10.6.0              | napi4                    |
diff --git a/crates/backend/src/typegen.rs b/crates/backend/src/typegen.rs
index 9cb61de4..814cfcd8 100644
--- a/crates/backend/src/typegen.rs
+++ b/crates/backend/src/typegen.rs
@@ -75,6 +75,7 @@ static KNOWN_TYPES: Lazy<HashMap<&'static str, &'static str>> = Lazy::new(|| {
     ("external", "object"),
     ("AbortSignal", "AbortSignal"),
     ("JsFunction", "(...args: any[]) => any"),
+    ("JsGlobal", "typeof global"),
   ]);
 
   map
diff --git a/crates/napi/src/bindgen_runtime/env.rs b/crates/napi/src/bindgen_runtime/env.rs
index b7628670..f1e05145 100644
--- a/crates/napi/src/bindgen_runtime/env.rs
+++ b/crates/napi/src/bindgen_runtime/env.rs
@@ -1,22 +1,57 @@
-use crate::{sys, Result};
+use std::cell::RefCell;
+use std::ptr;
 
-use super::{Array, Object};
+use crate::{check_status, sys, JsGlobal, JsNull, JsUndefined, NapiValue, Result};
 
-#[repr(transparent)]
-pub struct Env(sys::napi_env);
+use super::Array;
 
-impl From<sys::napi_env> for Env {
-  fn from(raw_env: sys::napi_env) -> Env {
-    Env(raw_env)
-  }
+pub use crate::Env;
+
+thread_local! {
+  static JS_UNDEFINED: RefCell<Option<JsUndefined>> = RefCell::default();
+  static JS_NULL: RefCell<Option<JsNull>> = RefCell::default();
 }
 
 impl Env {
-  pub fn create_object(&self) -> Result<Object> {
-    Object::new(self.0)
-  }
-
   pub fn create_array(&self, len: u32) -> Result<Array> {
     Array::new(self.0, len)
   }
+
+  /// Get [JsUndefined](./struct.JsUndefined.html) value
+  pub fn get_undefined(&self) -> Result<JsUndefined> {
+    if let Some(js_undefined) = JS_UNDEFINED.with(|x| *x.borrow()) {
+      return Ok(js_undefined);
+    }
+    let mut raw_value = ptr::null_mut();
+    check_status!(unsafe { sys::napi_get_undefined(self.0, &mut raw_value) })?;
+    let js_undefined = unsafe { JsUndefined::from_raw_unchecked(self.0, raw_value) };
+    JS_UNDEFINED.with(|x| x.borrow_mut().replace(js_undefined));
+    Ok(js_undefined)
+  }
+
+  pub fn get_null(&self) -> Result<JsNull> {
+    if let Some(js_null) = JS_NULL.with(|cell| *cell.borrow()) {
+      return Ok(js_null);
+    }
+    let mut raw_value = ptr::null_mut();
+    check_status!(unsafe { sys::napi_get_null(self.0, &mut raw_value) })?;
+    let js_null = unsafe { JsNull::from_raw_unchecked(self.0, raw_value) };
+    JS_NULL.with(|js_null_cell| {
+      js_null_cell.borrow_mut().replace(js_null);
+    });
+    Ok(js_null)
+  }
+
+  pub fn get_global(&self) -> Result<JsGlobal> {
+    let mut global = std::ptr::null_mut();
+    crate::check_status!(
+      unsafe { sys::napi_get_global(self.0, &mut global) },
+      "Get global object from Env failed"
+    )?;
+    Ok(JsGlobal(crate::Value {
+      value: global,
+      env: self.0,
+      value_type: crate::ValueType::Object,
+    }))
+  }
 }
diff --git a/crates/napi/src/bindgen_runtime/js_values/object.rs b/crates/napi/src/bindgen_runtime/js_values/object.rs
index 4729b274..3b33fcb4 100644
--- a/crates/napi/src/bindgen_runtime/js_values/object.rs
+++ b/crates/napi/src/bindgen_runtime/js_values/object.rs
@@ -1,10 +1,7 @@
-use crate::{bindgen_prelude::*, check_status, sys, type_of, ValueType};
+use crate::{bindgen_prelude::*, check_status, sys, type_of, JsObject, ValueType};
 use std::{ffi::CString, ptr};
 
-pub struct Object {
-  pub(crate) env: sys::napi_env,
-  pub(crate) inner: sys::napi_value,
-}
+pub type Object = JsObject;
 
 impl Object {
   pub(crate) fn new(env: sys::napi_env) -> Result<Self> {
@@ -16,7 +13,11 @@ impl Object {
       )?;
     }
 
-    Ok(Object { env, inner: ptr })
+    Ok(Self(crate::Value {
+      env,
+      value: ptr,
+      value_type: ValueType::Object,
+    }))
   }
 
   pub fn get<K: AsRef<str>, V: FromNapiValue>(&self, field: K) -> Result<Option<V>> {
@@ -26,17 +27,17 @@ impl Object {
       let mut ret = ptr::null_mut();
 
       check_status!(
-        sys::napi_get_named_property(self.env, self.inner, c_field.as_ptr(), &mut ret),
+        sys::napi_get_named_property(self.0.env, self.0.value, c_field.as_ptr(), &mut ret),
         "Failed to get property with field `{}`",
         c_field.to_string_lossy(),
       )?;
 
-      let ty = type_of!(self.env, ret)?;
+      let ty = type_of!(self.0.env, ret)?;
 
       Ok(if ty == ValueType::Undefined {
         None
       } else {
-        Some(V::from_napi_value(self.env, ret)?)
+        Some(V::from_napi_value(self.0.env, ret)?)
       })
     }
   }
@@ -45,10 +46,10 @@ impl Object {
     let c_field = CString::new(field.as_ref())?;
 
     unsafe {
-      let napi_val = V::to_napi_value(self.env, val)?;
+      let napi_val = V::to_napi_value(self.0.env, val)?;
 
       check_status!(
-        sys::napi_set_named_property(self.env, self.inner, c_field.as_ptr(), napi_val),
+        sys::napi_set_named_property(self.0.env, self.0.value, c_field.as_ptr(), napi_val),
         "Failed to set property with field `{}`",
         c_field.to_string_lossy(),
       )?;
@@ -61,12 +62,12 @@ impl Object {
     let mut names = ptr::null_mut();
     unsafe {
       check_status!(
-        sys::napi_get_property_names(obj.env, obj.inner, &mut names),
+        sys::napi_get_property_names(obj.0.env, obj.0.value, &mut names),
         "Failed to get property names of given object"
       )?;
     }
 
-    let names = unsafe { Array::from_napi_value(obj.env, names)? };
+    let names = unsafe { Array::from_napi_value(obj.0.env, names)? };
     let mut ret = vec![];
 
     for i in 0..names.len() {
@@ -86,25 +87,3 @@ impl TypeName for Object {
     ValueType::Object
   }
 }
-
-impl ToNapiValue for Object {
-  unsafe fn to_napi_value(_env: sys::napi_env, val: Self) -> Result<sys::napi_value> {
-    Ok(val.inner)
-  }
-}
-
-impl FromNapiValue for Object {
-  unsafe fn from_napi_value(env: sys::napi_env, napi_val: sys::napi_value) -> Result<Self> {
-    let value_type = type_of!(env, napi_val)?;
-    match value_type {
-      ValueType::Object => Ok(Self {
-        inner: napi_val,
-        env,
-      }),
-      _ => Err(Error::new(
-        Status::InvalidArg,
-        "Given napi value is not an object".to_owned(),
-      )),
-    }
-  }
-}
diff --git a/crates/napi/src/bindgen_runtime/js_values/serde.rs b/crates/napi/src/bindgen_runtime/js_values/serde.rs
index ff1add21..b7ab5cca 100644
--- a/crates/napi/src/bindgen_runtime/js_values/serde.rs
+++ b/crates/napi/src/bindgen_runtime/js_values/serde.rs
@@ -1,6 +1,8 @@
 use serde_json::{Map, Value};
 
-use crate::{bindgen_runtime::Null, check_status, sys, type_of, Error, Result, Status, ValueType};
+use crate::{
+  bindgen_runtime::Null, check_status, sys, type_of, Error, JsObject, Result, Status, ValueType,
+};
 
 use super::{FromNapiValue, Object, ToNapiValue};
 
@@ -78,10 +80,11 @@ impl ToNapiValue for Map<String, Value> {
 
 impl FromNapiValue for Map<String, Value> {
   unsafe fn from_napi_value(env: sys::napi_env, napi_val: sys::napi_value) -> Result<Self> {
-    let obj = Object {
+    let obj = JsObject(crate::Value {
       env,
-      inner: napi_val,
-    };
+      value: napi_val,
+      value_type: ValueType::Object,
+    });
 
     let mut map = Map::new();
     for key in Object::keys(&obj)?.into_iter() {
diff --git a/crates/napi/src/env.rs b/crates/napi/src/env.rs
index e57943e1..e8f2b686 100644
--- a/crates/napi/src/env.rs
+++ b/crates/napi/src/env.rs
@@ -43,25 +43,18 @@ pub type Callback = extern "C" fn(sys::napi_env, sys::napi_callback_info) -> sys
 /// Notification of this event is delivered through the callbacks given to `Env::add_env_cleanup_hook` and `Env::set_instance_data`.
 pub struct Env(pub(crate) sys::napi_env);
 
+impl From<sys::napi_env> for Env {
+  fn from(env: sys::napi_env) -> Self {
+    Env(env)
+  }
+}
+
 impl Env {
   #[allow(clippy::missing_safety_doc)]
   pub unsafe fn from_raw(env: sys::napi_env) -> Self {
     Env(env)
   }
 
-  /// Get [JsUndefined](./struct.JsUndefined.html) value
-  pub fn get_undefined(&self) -> Result<JsUndefined> {
-    let mut raw_value = ptr::null_mut();
-    check_status!(unsafe { sys::napi_get_undefined(self.0, &mut raw_value) })?;
-    Ok(unsafe { JsUndefined::from_raw_unchecked(self.0, raw_value) })
-  }
-
-  pub fn get_null(&self) -> Result<JsNull> {
-    let mut raw_value = ptr::null_mut();
-    check_status!(unsafe { sys::napi_get_null(self.0, &mut raw_value) })?;
-    Ok(unsafe { JsNull::from_raw_unchecked(self.0, raw_value) })
-  }
-
   pub fn get_boolean(&self, value: bool) -> Result<JsBoolean> {
     let mut raw_value = ptr::null_mut();
     check_status!(unsafe { sys::napi_get_boolean(self.0, value, &mut raw_value) })?;
@@ -231,7 +224,7 @@ impl Env {
     Ok(unsafe { JsObject::from_raw_unchecked(self.0, raw_value) })
   }
 
-  pub fn create_array(&self) -> Result<JsObject> {
+  pub fn create_empty_array(&self) -> Result<JsObject> {
     let mut raw_value = ptr::null_mut();
     check_status!(unsafe { sys::napi_create_array(self.0, &mut raw_value) })?;
     Ok(unsafe { JsObject::from_raw_unchecked(self.0, raw_value) })
@@ -949,12 +942,6 @@ impl Env {
     result
   }
 
-  pub fn get_global(&self) -> Result<JsGlobal> {
-    let mut raw_global = ptr::null_mut();
-    check_status!(unsafe { sys::napi_get_global(self.0, &mut raw_global) })?;
-    Ok(unsafe { JsGlobal::from_raw_unchecked(self.0, raw_global) })
-  }
-
   pub fn get_napi_version(&self) -> Result<u32> {
     let global = self.get_global()?;
     let process: JsObject = global.get_named_property("process")?;
diff --git a/crates/napi/src/js_values/global.rs b/crates/napi/src/js_values/global.rs
index aff3cbad..b6ce46de 100644
--- a/crates/napi/src/js_values/global.rs
+++ b/crates/napi/src/js_values/global.rs
@@ -9,7 +9,7 @@ pub struct JsTimeout(pub(crate) Value);
 
 impl JsGlobal {
   pub fn set_interval(&self, handler: JsFunction, interval: f64) -> Result<JsTimeout> {
-    let func: JsFunction = self.get_named_property("setInterval")?;
+    let func: JsFunction = self.get_named_property_unchecked("setInterval")?;
     func
       .call(
         None,
@@ -24,14 +24,14 @@ impl JsGlobal {
   }
 
   pub fn clear_interval(&self, timer: JsTimeout) -> Result<JsUndefined> {
-    let func: JsFunction = self.get_named_property("clearInterval")?;
+    let func: JsFunction = self.get_named_property_unchecked("clearInterval")?;
     func
       .call(None, &[timer.into_unknown()])
       .and_then(|ret| ret.try_into())
   }
 
   pub fn set_timeout(&self, handler: JsFunction, interval: f64) -> Result<JsTimeout> {
-    let func: JsFunction = self.get_named_property("setTimeout")?;
+    let func: JsFunction = self.get_named_property_unchecked("setTimeout")?;
     func
       .call(
         None,
@@ -46,7 +46,7 @@ impl JsGlobal {
   }
 
   pub fn clear_timeout(&self, timer: JsTimeout) -> Result<JsUndefined> {
-    let func: JsFunction = self.get_named_property("clearTimeout")?;
+    let func: JsFunction = self.get_named_property_unchecked("clearTimeout")?;
     func
       .call(None, &[timer.into_unknown()])
       .and_then(|ret| ret.try_into())
diff --git a/crates/napi/src/js_values/object.rs b/crates/napi/src/js_values/object.rs
index e1727041..59fbab1a 100644
--- a/crates/napi/src/js_values/object.rs
+++ b/crates/napi/src/js_values/object.rs
@@ -8,7 +8,6 @@ use std::ptr;
 #[cfg(feature = "napi5")]
 use super::check_status;
 use super::Value;
-use crate::bindgen_runtime::TypeName;
 #[cfg(feature = "napi5")]
 use crate::sys;
 #[cfg(feature = "napi5")]
@@ -17,20 +16,9 @@ use crate::Env;
 use crate::Error;
 #[cfg(feature = "napi5")]
 use crate::Result;
-use crate::ValueType;
 
 pub struct JsObject(pub(crate) Value);
 
-impl TypeName for JsObject {
-  fn type_name() -> &'static str {
-    "Object"
-  }
-
-  fn value_type() -> crate::ValueType {
-    ValueType::Object
-  }
-}
-
 #[cfg(feature = "napi5")]
 pub struct FinalizeContext<T: 'static, Hint: 'static> {
   pub env: Env,
diff --git a/examples/napi-compat-mode/src/array.rs b/examples/napi-compat-mode/src/array.rs
index 3df64fd6..b880054f 100644
--- a/examples/napi-compat-mode/src/array.rs
+++ b/examples/napi-compat-mode/src/array.rs
@@ -7,7 +7,7 @@ use napi::{
 
 #[contextless_function]
 fn test_create_array(env: Env) -> ContextlessResult<JsObject> {
-  env.create_array().map(Some)
+  env.create_empty_array().map(Some)
 }
 
 #[js_function(1)]
diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index f8b7e4d6..df52895a 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -34,6 +34,9 @@ Generated by [AVA](https://avajs.dev).
     export function fibonacci(n: number): number␊
     export function listObjKeys(obj: object): Array<string>␊
     export function createObj(): object␊
+    export function getGlobal(): typeof global␊
+    export function getUndefined(): JsUndefined␊
+    export function getNull(): JsNull␊
     export function asyncPlus100(p: Promise<number>): Promise<number>␊
     interface PackageJson {␊
       name: string␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index 31e68ac4..a8561624 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 c14d46b0..fd818df4 100644
--- a/examples/napi/__test__/values.spec.ts
+++ b/examples/napi/__test__/values.spec.ts
@@ -41,6 +41,9 @@ import {
   callThreadsafeFunction,
   threadsafeFunctionThrowError,
   asyncPlus100,
+  getGlobal,
+  getUndefined,
+  getNull,
 } from '../'
 
 test('number', (t) => {
@@ -137,6 +140,22 @@ test('object', (t) => {
   t.deepEqual(createObj(), { test: 1 })
 })
 
+test('global', (t) => {
+  t.is(getGlobal(), global)
+})
+
+test('get undefined', (t) => {
+  for (const _ of Array.from({ length: 100 })) {
+    t.is(getUndefined(), undefined)
+  }
+})
+
+test('get null', (t) => {
+  for (const _ of Array.from({ length: 100 })) {
+    t.is(getNull(), null)
+  }
+})
+
 test('Option', (t) => {
   t.is(mapOption(null), null)
   t.is(mapOption(3), 4)
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index c1fda3e2..d850dddf 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -7,7 +7,9 @@ export function bigintAdd(a: BigInt, b: BigInt): BigInt
 export function createBigInt(): BigInt
 export function createBigIntI64(): BigInt
 export function getCwd(callback: (arg0: string) => void): void
-export function readFile(callback: (arg0: Error | undefined, arg1: string | null) => void): void
+export function readFile(
+  callback: (arg0: Error | undefined, arg1: string | null) => void,
+): void
 export function eitherStringOrNumber(input: string | number): number
 export function returnEither(input: number): string | number
 export function either3(input: string | number | boolean): number
@@ -15,8 +17,21 @@ interface Obj {
   v: string | number
 }
 export function either4(input: string | number | boolean | Obj): number
-export enum Kind { Dog = 0, Cat = 1, Duck = 2 }
-export enum CustomNumEnum { One = 1, Two = 2, Three = 3, Four = 4, Six = 6, Eight = 8, Nine = 9, Ten = 10 }
+export enum Kind {
+  Dog = 0,
+  Cat = 1,
+  Duck = 2,
+}
+export enum CustomNumEnum {
+  One = 1,
+  Two = 2,
+  Three = 3,
+  Four = 4,
+  Six = 6,
+  Eight = 8,
+  Nine = 9,
+  Ten = 10,
+}
 export function enumToI32(e: CustomNumEnum): number
 export function throwError(): void
 export function mapOption(val: number | null): number | null
@@ -24,6 +39,9 @@ export function add(a: number, b: number): number
 export function fibonacci(n: number): number
 export function listObjKeys(obj: object): Array<string>
 export function createObj(): object
+export function getGlobal(): typeof global
+export function getUndefined(): JsUndefined
+export function getNull(): JsNull
 export function asyncPlus100(p: Promise<number>): Promise<number>
 interface PackageJson {
   name: string
@@ -38,7 +56,11 @@ export function concatStr(s: string): string
 export function concatUtf16(s: string): string
 export function concatLatin1(s: string): string
 export function withoutAbortController(a: number, b: number): Promise<number>
-export function withAbortController(a: number, b: number, signal: AbortSignal): Promise<number>
+export function withAbortController(
+  a: number,
+  b: number,
+  signal: AbortSignal,
+): Promise<number>
 export function callThreadsafeFunction(callback: (...args: any[]) => any): void
 export function threadsafeFunctionThrowError(cb: (...args: any[]) => any): void
 export function getBuffer(): Buffer
@@ -52,14 +74,10 @@ export class Animal {
   static getDogKind(): Kind
 }
 export class Blake2BHasher {
-  
   static withKey(key: Blake2bKey): Blake2BHasher
 }
-export class Blake2BKey {
-  
-}
+export class Blake2BKey {}
 export class Context {
-  
   constructor()
   static withData(data: string): Context
   method(): string
diff --git a/examples/napi/src/object.rs b/examples/napi/src/object.rs
index 690addea..71c868a1 100644
--- a/examples/napi/src/object.rs
+++ b/examples/napi/src/object.rs
@@ -1,4 +1,4 @@
-use napi::bindgen_prelude::*;
+use napi::{bindgen_prelude::*, JsGlobal, JsNull, JsUndefined};
 
 #[napi]
 fn list_obj_keys(obj: Object) -> Vec<String> {
@@ -12,3 +12,18 @@ fn create_obj(env: Env) -> Object {
 
   obj
 }
+
+#[napi]
+fn get_global(env: Env) -> Result<JsGlobal> {
+  env.get_global()
+}
+
+#[napi]
+fn get_undefined(env: Env) -> Result<JsUndefined> {
+  env.get_undefined()
+}
+
+#[napi]
+fn get_null(env: Env) -> Result<JsNull> {
+  env.get_null()
+}