diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9299a975..4c1b7f36 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# [1.0.0-beta.5](https://github.com/casbin/casbin.js/compare/v1.0.0-beta.4...v1.0.0-beta.5) (2021-09-29)
+
+
+### Features
+
+* RBAC with Domains API ([5e49b41](https://github.com/casbin/casbin.js/commit/5e49b41a2988a20e324715377e0c8302c9e9c3aa))
+
 # [1.0.0-beta.4](https://github.com/casbin/casbin.js/compare/v1.0.0-beta.3...v1.0.0-beta.4) (2021-08-31)
 
 
diff --git a/package.json b/package.json
index 859ba44e..62258ab4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "casbin.js",
-  "version": "1.0.0-beta.4",
+  "version": "1.0.0-beta.5",
   "description": "An authorization library that supports access control models like ACL, RBAC, ABAC in Typescript",
   "main": "lib/cjs/index.js",
   "typings": "lib/cjs/index.d.ts",
diff --git a/src/enforcer.ts b/src/enforcer.ts
index 734ef66f..65750578 100644
--- a/src/enforcer.ts
+++ b/src/enforcer.ts
@@ -144,6 +144,19 @@ export class Enforcer extends ManagementEnforcer {
     }
   }
 
+  /**
+   * addRoleForUserInDomain adds a role for a user.
+   * Returns false if the user already has the role (aka not affected).
+   *
+   * @param user the user.
+   * @param role the role.
+   * @param domain the domain.
+   * @return succeeds or not.
+   */
+  public async addRoleForUserInDomain(user: string, role: string, domain: string): Promise<boolean> {
+    return this.addGroupingPolicy(user, role, domain);
+  }
+
   /**
    * deleteRoleForUser deletes a role for a user.
    * Returns false if the user does not have the role (aka not affected).
@@ -160,6 +173,18 @@ export class Enforcer extends ManagementEnforcer {
       return this.removeGroupingPolicy(user, role, domain);
     }
   }
+  /**
+   * deleteRoleForUserInDomain deletes a role for a user.
+   * Returns false if the user does not have the role (aka not affected).
+   *
+   * @param user the user.
+   * @param role the role.
+   * @param domain the domain.
+   * @return succeeds or not.
+   */
+  public async deleteRoleForUserInDomain(user: string, role: string, domain?: string): Promise<boolean> {
+    return this.deleteRoleForUser(user, role, domain);
+  }
 
   /**
    * deleteRolesForUser deletes all roles for a user.
@@ -177,6 +202,18 @@ export class Enforcer extends ManagementEnforcer {
     }
   }
 
+  /**
+   * deleteRolesForUserInDomain deletes all roles for a user.
+   * Returns false if the user does not have any roles (aka not affected).
+   *
+   * @param user the user.
+   * @param domain the domain.
+   * @return succeeds or not.
+   */
+  public async deleteRolesForUserInDomain(user: string, domain?: string): Promise<boolean> {
+    return this.deleteRolesForUser(user, domain);
+  }
+
   /**
    * deleteUser deletes a user.
    * Returns false if the user does not exist (aka not affected).
@@ -313,6 +350,7 @@ export class Enforcer extends ManagementEnforcer {
    * getPermissionsForUser("alice") can only get: [["alice", "data2", "read"]].
    * But getImplicitPermissionsForUser("alice") will get: [["admin", "data1", "read"], ["alice", "data2", "read"]].
    */
+
   public async getImplicitPermissionsForUser(user: string, ...domain: string[]): Promise<string[][]> {
     const roles = await this.getImplicitRolesForUser(user, ...domain);
     roles.unshift(user);
@@ -332,6 +370,16 @@ export class Enforcer extends ManagementEnforcer {
     return res;
   }
 
+  /**
+   * getPermissionsForUserInDomain gets implicit permissions for a user or role.
+   * Compared to getPermissionsForUser(), this function retrieves permissions for inherited roles.
+   */
+
+  public async getPermissionsForUserInDomain(user: string, domain: string): Promise<string[][]> {
+    const res = await this.getImplicitPermissionsForUser(user, domain);
+    return res;
+  }
+
   /**
    * getImplicitUsersForPermission gets implicit users for a permission.
    * For example:
diff --git a/test/rbacAPI.test.ts b/test/rbacAPI.test.ts
index b15a205e..4a4c6b4a 100644
--- a/test/rbacAPI.test.ts
+++ b/test/rbacAPI.test.ts
@@ -174,3 +174,24 @@ test('test getImplicitUsersForPermission', async () => {
 
   expect(await e.getImplicitUsersForPermission('data1', 'read')).toEqual(['bob', 'alice']);
 });
+
+test('test getPermissionsForUserInDomain', async () => {
+  const e = await getEnforcerWithPath('examples/rbac_with_domains_model.conf', 'examples/rbac_with_domains_policy.csv');
+  expect(await e.getPermissionsForUserInDomain('alice', 'domain1')).toEqual([
+    ['admin', 'domain1', 'data1', 'read'],
+    ['admin', 'domain1', 'data1', 'write'],
+  ]);
+  expect(await e.getPermissionsForUserInDomain('bob', 'domain2')).toEqual([
+    ['admin', 'domain2', 'data2', 'read'],
+    ['admin', 'domain2', 'data2', 'write'],
+  ]);
+});
+test('test add/deleteRoleForUserInDomain', async () => {
+  const e = await getEnforcerWithPath('examples/rbac_with_domains_model.conf', 'examples/rbac_with_hierarchy_with_domains_policy.csv');
+  expect(await e.addRoleForUserInDomain('bob', 'role:global_admin', 'domain1')).toEqual(true);
+  expect(await e.hasRoleForUser('bob', 'role:global_admin', 'domain1')).toEqual(true);
+  expect(await e.getUsersForRole('role:global_admin', 'domain1')).toEqual(['alice', 'bob']);
+  expect(await e.deleteRoleForUserInDomain('bob', 'role:global_admin', 'domain1')).toEqual(true);
+  expect(await e.hasRoleForUser('bob', 'role:global_admin', 'domain1')).toEqual(false);
+  expect(await e.getUsersForRole('role:global_admin', 'domain1')).toEqual(['alice']);
+});