diff --git a/test/types/data_types.ts b/test/types/data_types.ts
new file mode 100644
index 00000000..3412c2b0
--- /dev/null
+++ b/test/types/data_types.ts
@@ -0,0 +1,31 @@
+import { strict as assert } from 'assert';
+import Realm, { Bone, DataTypes } from '../..';
+
+describe('=> Data types (TypeScript)', function() {
+  const { STRING, TEXT, BLOB } = DataTypes;
+
+  it('Bone.DataTypes', async function() {
+    assert.equal(Bone.DataTypes, DataTypes);
+  });
+
+  it('realm.Bone.DataTypes', async function() {
+    const realm = new Realm({
+      dialect: 'sqlite',
+      database: '/tmp/leoric.sqlite3',
+    });
+    // should be mixed with dialect overrides
+    assert.notEqual(realm.Bone.DataTypes, DataTypes);
+  })
+
+  it('STRING', async function() {
+    assert.equal(STRING(255).toSqlString(), 'VARCHAR(255)');
+  });
+
+  it('TEXT', async function() {
+    assert.equal(TEXT('long').toSqlString(), 'LONGTEXT');
+  });
+
+  it('BLOB', async function() {
+    assert.equal(BLOB('medium').toSqlString(), 'MEDIUMBLOB');
+  });
+});
diff --git a/types/data_types.d.ts b/types/data_types.d.ts
new file mode 100644
index 00000000..e8e0a766
--- /dev/null
+++ b/types/data_types.d.ts
@@ -0,0 +1,88 @@
+type LENGTH_VARIANTS = 'tiny' | '' | 'medium' | 'long';
+
+interface INVOKABLE<T> {
+  (length: LENGTH_VARIANTS): T;
+  (length: number): T;
+}
+
+export default class DataType {
+  toSqlString(): string;
+
+  static STRING: typeof STRING & INVOKABLE<STRING>;
+  static INTEGER: typeof INTEGER & INVOKABLE<INTEGER>;
+  static BIGINT: typeof BIGINT & INVOKABLE<BIGINT>;
+  static TEXT: typeof TEXT & INVOKABLE<TEXT>;
+  static BLOB: typeof BLOB & INVOKABLE<BLOB>;
+  static JSON: typeof JSON & INVOKABLE<JSON>;
+  static JSONB: typeof JSONB & INVOKABLE<JSONB>;
+  static BINARY: typeof BINARY & INVOKABLE<BINARY>;
+  static VARBINARY: typeof VARBINARY & INVOKABLE<VARBINARY>;
+  static DATE: typeof DATE & INVOKABLE<DATE>;
+  static DATEONLY: typeof DATEONLY & INVOKABLE<DATEONLY>;
+  static BOOLEAN: typeof BOOLEAN & INVOKABLE<BOOLEAN>;
+}
+
+declare class STRING extends DataType {
+  dataType: 'varchar';
+  length: number;
+  constructor(length: number);
+}
+
+declare class INTEGER extends DataType {
+  dataType: 'integer' | 'bigint';
+  length: number;
+  constructor(length: number);
+  get UNSIGNED(): this;
+  get ZEROFILL(): this;
+}
+
+declare class BIGINT extends INTEGER {
+  dataType: 'bigint';
+}
+
+declare class TEXT extends DataType {
+  dataType: 'text';
+  length: LENGTH_VARIANTS;
+  constructor(length: LENGTH_VARIANTS);
+}
+
+declare class BLOB extends DataType {
+  dataType: 'blob';
+  length: LENGTH_VARIANTS;
+  constructor(length: LENGTH_VARIANTS)
+}
+
+declare class JSON extends DataType {
+  dataType: 'text' | 'json';
+}
+
+declare class JSONB extends JSON {
+  dataType: 'json';
+}
+
+declare class BINARY extends DataType {
+  dataType: 'binary';
+  length: number;
+  constructor(length: number);
+}
+
+declare class VARBINARY extends DataType {
+  dataType: 'varbinary';
+  length: number;
+  constructor(length: number);
+}
+
+declare class DATE extends DataType {
+  dataType: 'date';
+  precision: number;
+  timezone: boolean;
+  constructor(precision: number, timezone?: boolean)
+}
+
+declare class DATEONLY extends DataType {
+  dataType: 'dateonly';
+}
+
+declare class BOOLEAN extends DataType {
+  dataType: 'boolean'
+}
diff --git a/types/index.d.ts b/types/index.d.ts
index 0bfbe9c2..cfb495d2 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -1,3 +1,11 @@
+import DataType from './data_types';
+
+export { DataType as DataTypes };
+
+type DataTypes<T> = {
+  [Property in keyof T as Exclude<Property, "toSqlString">]: T[Property]
+}
+
 interface ExprIdentifier {
   type: 'id';
   value: string;
@@ -129,21 +137,15 @@ type InstanceValues<T> = {
   [Property in keyof Extract<T, Literal>]?: Extract<T, Literal>[Property]
 }
 
-declare class DataType {}
-
-export const DataTypes: {
-  [key in 'STRING' | 'INTEGER' | 'BIGINT' | 'DATE' | 'BOOLEAN' | 'TEXT' | 'BLOB' | 'JSON' | 'JSONB' | 'BINARY' | 'VARBINARY' ]: DataType;
-};
-
 interface AttributeMeta {
-  column: string;
-  columnType: string;
-  allowNull: boolean;
-  defaultValue: Literal;
-  primaryKey: boolean;
-  dataType: string;
-  jsType: Literal;
-  type: DataType;
+  column?: string;
+  columnType?: string;
+  allowNull?: boolean;
+  defaultValue?: Literal;
+  primaryKey?: boolean;
+  dataType?: string;
+  jsType?: Literal;
+  type: DataTypes<DataType>;
 }
 
 interface RelateOptions {
@@ -212,8 +214,10 @@ declare class Collection<T extends Bone> extends Array<T> {
 }
 
 export class Bone {
+  static DataTypes: DataType;
+
   /**
-   * The connection pool of the specified client, with few `Leoric_` prefixed methods extended to eliminate client differences.
+   * get the connection pool of the driver
    */
   static pool: Pool;
 
@@ -250,7 +254,7 @@ export class Bone {
   /**
    * The attribute definitions of the model.
    */
-  static attributes: { [key: string]: DataType | AttributeMeta };
+  static attributes: { [key: string]: DataTypes<DataType> | AttributeMeta };
 
   /**
    * The schema info of current model.
@@ -617,7 +621,7 @@ interface RawQueryOptions {
 }
 
 export default class Realm {
-  Bone: Bone;
+  Bone: typeof Bone;
   driver: Driver;
   models: Record<string, Bone>;