diff --git a/packages/bcrypt/README.md b/packages/bcrypt/README.md
index c7fd3596..f1f9f37a 100644
--- a/packages/bcrypt/README.md
+++ b/packages/bcrypt/README.md
@@ -43,15 +43,13 @@ export function compare(password: string | Buffer, hash: string | Buffer): Promi
 
 export type Version = '2a' | '2x' | '2y' | '2b'
 /**
- * @param round default 10
  * @param version default '2b'
  */
-export function genSaltSync(round?: number, version?: Version): string
+export function genSaltSync(round: number, version?: Version): string
 /**
- * @param round default 10
  * @param version default '2b'
  */
-export function genSalt(round?: number, version?: Version): Promise<string>
+export function genSalt(round: number, version?: Version): Promise<string>
 ```
 
 ## Bench
diff --git a/packages/bcrypt/__tests__/bcrypt.spec.ts b/packages/bcrypt/__tests__/bcrypt.spec.ts
index dd03c27a..c875d3be 100644
--- a/packages/bcrypt/__tests__/bcrypt.spec.ts
+++ b/packages/bcrypt/__tests__/bcrypt.spec.ts
@@ -1,6 +1,6 @@
 import test from 'ava'
 
-import { verifySync, compareSync, verify, compare, hash } from '../index'
+import { verifySync, compareSync, verify, compare, hash, genSaltSync, genSalt } from '../index'
 
 const { hashSync } = require('bcryptjs')
 
@@ -8,6 +8,24 @@ const fx = Buffer.from('bcrypt-test-password')
 
 const hashedPassword = hashSync(fx.toString('utf8'), 10)
 
+test('genSaltSync should return a string', (t) => {
+  t.is(typeof genSaltSync(10), 'string')
+  t.is(typeof genSaltSync(10, '2a'), 'string')
+  t.is(typeof genSaltSync(10, '2b'), 'string')
+  t.is(typeof genSaltSync(10, '2y'), 'string')
+  t.is(typeof genSaltSync(10, '2x'), 'string')
+  t.throws(() => genSaltSync(10, 'invalid' as any))
+})
+
+test('genSalt should return a string', async (t) => {
+  t.is(typeof (await genSalt(10)), 'string')
+  t.is(typeof (await genSalt(10, '2a')), 'string')
+  t.is(typeof (await genSalt(10, '2b')), 'string')
+  t.is(typeof (await genSalt(10, '2y')), 'string')
+  t.is(typeof (await genSalt(10, '2x')), 'string')
+  await t.throwsAsync(async () => genSalt(10, 'invalid' as any))
+})
+
 test('verifySync hashed password from bcrypt should be true', (t) => {
   t.true(verifySync(fx, hashedPassword))
 })
diff --git a/packages/bcrypt/binding.d.ts b/packages/bcrypt/binding.d.ts
index dc017847..4f89446d 100644
--- a/packages/bcrypt/binding.d.ts
+++ b/packages/bcrypt/binding.d.ts
@@ -4,8 +4,8 @@
 /* auto-generated by NAPI-RS */
 
 export const DEFAULT_COST: number
-export function genSaltSync(round: number, version: string): string
-export function genSalt(round: number, version: string, signal?: AbortSignal | undefined | null): Promise<string>
+export function genSaltSync(round: number, version?: '2a' | '2x' | '2y' | '2b'): string
+export function genSalt(round: number, version?: '2a' | '2x' | '2y' | '2b', signal?: AbortSignal): Promise<string>
 export function hashSync(
   input: string | Buffer,
   cost?: number | undefined | null,
diff --git a/packages/bcrypt/src/lib.rs b/packages/bcrypt/src/lib.rs
index 496f37f5..70d87b4c 100644
--- a/packages/bcrypt/src/lib.rs
+++ b/packages/bcrypt/src/lib.rs
@@ -21,7 +21,7 @@ mod verify_task;
 #[napi]
 pub const DEFAULT_COST: u32 = 12;
 
-#[napi]
+#[napi(ts_args_type = "round: number, version?: '2a' | '2x' | '2y' | '2b'")]
 pub fn gen_salt_sync(round: u32, version: Option<String>) -> Result<String> {
   let salt = gen_salt().map_err(|err| {
     Error::new(
@@ -32,7 +32,10 @@ pub fn gen_salt_sync(round: u32, version: Option<String>) -> Result<String> {
   Ok(format_salt(round, &version_from_str(version)?, &salt))
 }
 
-#[napi(js_name = "genSalt")]
+#[napi(
+  js_name = "genSalt",
+  ts_args_type = "round: number, version?: '2a' | '2x' | '2y' | '2b', signal?: AbortSignal"
+)]
 pub fn gen_salt_js(
   round: u32,
   version: Option<String>,
@@ -119,8 +122,8 @@ fn version_from_str(version: Option<String>) -> Result<Version> {
   match version.as_deref() {
     Some("2a") => Ok(Version::TwoA),
     Some("2b") | None => Ok(Version::TwoB),
-    Some("2y") => Ok(Version::TwoX),
-    Some("2x") => Ok(Version::TwoY),
+    Some("2x") => Ok(Version::TwoX),
+    Some("2y") => Ok(Version::TwoY),
     Some(version) => Err(Error::new(
       Status::InvalidArg,
       format!("{version} is not a valid version"),
diff --git a/packages/deno-lint/index.js b/packages/deno-lint/index.js
index ce1ff9d1..5733e8e5 100644
--- a/packages/deno-lint/index.js
+++ b/packages/deno-lint/index.js
@@ -1,3 +1,9 @@
+/* tslint:disable */
+/* eslint-disable */
+/* prettier-ignore */
+
+/* auto-generated by NAPI-RS */
+
 const { existsSync, readFileSync } = require('fs')
 const { join } = require('path')
 
diff --git a/packages/jieba/index.js b/packages/jieba/index.js
index cf3ad2a8..76b71d36 100644
--- a/packages/jieba/index.js
+++ b/packages/jieba/index.js
@@ -1,3 +1,9 @@
+/* tslint:disable */
+/* eslint-disable */
+/* prettier-ignore */
+
+/* auto-generated by NAPI-RS */
+
 const { existsSync, readFileSync } = require('fs')
 const { join } = require('path')
 
diff --git a/packages/jsonwebtoken/index.js b/packages/jsonwebtoken/index.js
index 4ca0ecee..d5b60ada 100644
--- a/packages/jsonwebtoken/index.js
+++ b/packages/jsonwebtoken/index.js
@@ -1,3 +1,9 @@
+/* tslint:disable */
+/* eslint-disable */
+/* prettier-ignore */
+
+/* auto-generated by NAPI-RS */
+
 const { existsSync, readFileSync } = require('fs')
 const { join } = require('path')
 
diff --git a/packages/xxhash/index.js b/packages/xxhash/index.js
index fa714f9a..093e6f13 100644
--- a/packages/xxhash/index.js
+++ b/packages/xxhash/index.js
@@ -1,3 +1,9 @@
+/* tslint:disable */
+/* eslint-disable */
+/* prettier-ignore */
+
+/* auto-generated by NAPI-RS */
+
 const { existsSync, readFileSync } = require('fs')
 const { join } = require('path')