diff --git a/build/build.js b/build/build.js
index d224b06..8d026e0 100755
--- a/build/build.js
+++ b/build/build.js
@@ -128,7 +128,7 @@ function createRollupConfig({ min } = {}) {
                             module: 'ES2015',
                             sourceMap: true,
                             // Use the esm d.ts
-                            declaration: false
+                            declaration: true
                         }
                         // include: include,
                         // exclude: exclude || []
diff --git a/dist/aggregate.d.ts b/dist/aggregate.d.ts
new file mode 100644
index 0000000..19ab71b
--- /dev/null
+++ b/dist/aggregate.d.ts
@@ -0,0 +1,27 @@
+import { DataTransformOption, DimensionLoose, DimensionName, ExternalDataTransform } from './types';
+export interface AggregateTransformOption extends DataTransformOption {
+    type: 'ecSimpleTransform:aggregate';
+    config: {
+        resultDimensions: {
+            name: DimensionName;
+            from: DimensionLoose;
+            method: AggregateMethodLoose;
+        }[];
+        groupBy: DimensionLoose;
+    };
+}
+declare const METHOD_INTERNAL: {
+    readonly SUM: true;
+    readonly COUNT: true;
+    readonly FIRST: true;
+    readonly AVERAGE: true;
+    readonly Q1: true;
+    readonly Q2: true;
+    readonly Q3: true;
+    readonly MIN: true;
+    readonly MAX: true;
+};
+declare type AggregateMethodLoose = AggregateMethodInternal | 'sum' | 'count' | 'first' | 'average' | 'Q1' | 'Q2' | 'Q3' | 'median' | 'min' | 'max';
+declare type AggregateMethodInternal = keyof typeof METHOD_INTERNAL;
+export declare const transform: ExternalDataTransform<AggregateTransformOption>;
+export {};
diff --git a/dist/id.d.ts b/dist/id.d.ts
new file mode 100644
index 0000000..9da1c4d
--- /dev/null
+++ b/dist/id.d.ts
@@ -0,0 +1,9 @@
+import { DataTransformOption, DimensionIndex, DimensionName, ExternalDataTransform } from './types';
+export interface IdTransformOption extends DataTransformOption {
+    type: 'ecSimpleTransform:id';
+    config: {
+        dimensionIndex: DimensionIndex;
+        dimensionName: DimensionName;
+    };
+}
+export declare const transform: ExternalDataTransform<IdTransformOption>;
diff --git a/dist/index.d.ts b/dist/index.d.ts
new file mode 100644
index 0000000..8f86b24
--- /dev/null
+++ b/dist/index.d.ts
@@ -0,0 +1,2 @@
+export { transform as id } from './id';
+export { transform as aggregate } from './aggregate';
diff --git a/dist/types.d.ts b/dist/types.d.ts
new file mode 100644
index 0000000..82ac96e
--- /dev/null
+++ b/dist/types.d.ts
@@ -0,0 +1,73 @@
+export declare type Dictionary<T> = {
+    [key: string]: T;
+};
+export declare type DimensionIndex = number;
+export declare type DimensionName = string;
+export declare type DimensionIndexLoose = DimensionIndex | string;
+export declare type DimensionLoose = DimensionName | DimensionIndexLoose;
+export declare type DataTransformType = string;
+export declare type DataTransformConfig = unknown;
+export declare type ParsedValue = ParsedValueNumeric | OrdinalRawValue;
+export declare type ParsedValueNumeric = number | OrdinalNumber;
+export declare type OrdinalRawValue = string | number;
+export declare type OrdinalNumber = number;
+export declare const SOURCE_FORMAT_ORIGINAL: "original";
+export declare const SOURCE_FORMAT_ARRAY_ROWS: "arrayRows";
+export declare const SOURCE_FORMAT_OBJECT_ROWS: "objectRows";
+export declare const SOURCE_FORMAT_KEYED_COLUMNS: "keyedColumns";
+export declare const SOURCE_FORMAT_TYPED_ARRAY: "typedArray";
+export declare const SOURCE_FORMAT_UNKNOWN: "unknown";
+export declare type SourceFormat = typeof SOURCE_FORMAT_ORIGINAL | typeof SOURCE_FORMAT_ARRAY_ROWS | typeof SOURCE_FORMAT_OBJECT_ROWS | typeof SOURCE_FORMAT_KEYED_COLUMNS | typeof SOURCE_FORMAT_TYPED_ARRAY | typeof SOURCE_FORMAT_UNKNOWN;
+declare const dataCtors: {
+    float: Float64ArrayConstructor | ArrayConstructor;
+    int: ArrayConstructor | Int32ArrayConstructor;
+    ordinal: ArrayConstructor;
+    number: ArrayConstructor;
+    time: ArrayConstructor;
+};
+export declare type ListDimensionType = keyof typeof dataCtors;
+export declare type DimensionDefinition = {
+    type?: ListDimensionType;
+    name?: DimensionName;
+    displayName?: string;
+};
+export declare type DimensionDefinitionLoose = DimensionDefinition['name'] | DimensionDefinition;
+export interface DataTransformOption {
+    type: DataTransformType;
+    config: DataTransformConfig;
+    print?: boolean;
+}
+export declare type OptionDataValue = string | number | Date;
+export declare type OptionSourceDataArrayRows<VAL extends OptionDataValue = OptionDataValue> = Array<Array<VAL>>;
+export declare type OptionSourceDataObjectRows<VAL extends OptionDataValue = OptionDataValue> = Array<Dictionary<VAL>>;
+export interface ExternalDataTransform<TO extends DataTransformOption = DataTransformOption> {
+    type: string;
+    __isBuiltIn?: boolean;
+    transform: (param: ExternalDataTransformParam<TO>) => ExternalDataTransformResultItem | ExternalDataTransformResultItem[];
+}
+interface ExternalDataTransformParam<TO extends DataTransformOption = DataTransformOption> {
+    upstream: ExternalSource;
+    upstreamList: ExternalSource[];
+    config: TO['config'];
+}
+export interface ExternalDataTransformResultItem {
+    data: OptionSourceDataArrayRows | OptionSourceDataObjectRows;
+    dimensions?: DimensionDefinitionLoose[];
+}
+export declare type DataTransformDataItem = ExternalDataTransformResultItem['data'][number];
+export interface ExternalDimensionDefinition extends Partial<DimensionDefinition> {
+    index: DimensionIndex;
+}
+export interface ExternalSource {
+    sourceFormat: SourceFormat;
+    getRawDataItem(dataIndex: number): number;
+    getRawDataItem(dataIndex: number): DataTransformDataItem;
+    cloneRawData(): OptionSourceDataArrayRows | OptionSourceDataObjectRows;
+    getDimensionInfo(dim: DimensionLoose): ExternalDimensionDefinition;
+    cloneAllDimensionInfo(): ExternalDimensionDefinition[];
+    count(): number;
+    retrieveValue(dataIndex: number, dimIndex: DimensionIndex): OptionDataValue;
+    retrieveValueFromItem(dataItem: DataTransformDataItem, dimIndex: DimensionIndex): OptionDataValue;
+    convertValue(rawVal: unknown, dimInfo: ExternalDimensionDefinition): ParsedValue;
+}
+export {};
diff --git a/dist/util.d.ts b/dist/util.d.ts
new file mode 100644
index 0000000..ee15c1a
--- /dev/null
+++ b/dist/util.d.ts
@@ -0,0 +1,3 @@
+export declare function assert(condition: any, message?: string): void;
+export declare function hasOwn(own: object, prop: string): boolean;
+export declare function quantile(ascArr: number[], p: number): number;
diff --git a/package.json b/package.json
index 579df94..f6a4ff0 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,7 @@
   "description": "Some simple data transforms for Apache ECharts 5",
   "license": "Apache-2.0",
   "main": "dist/ecSimpleTransform.js",
+  "types": "dist/index.d.ts",
   "jsdelivr": "dist/ecSimpleTransform.min.js",
   "repository": {
     "type": "git",