diff --git a/.gitignore b/.gitignore
index 79fc551..781f9e1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 
+dist/*
 _book/*
 
 # Runtime data
diff --git a/dist/accessor_decorators.js b/dist/accessor_decorators.js
deleted file mode 100644
index b12c0e3..0000000
--- a/dist/accessor_decorators.js
+++ /dev/null
@@ -1,43 +0,0 @@
-'use strict';
-var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
-    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
-    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
-    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
-    return c > 3 && r && Object.defineProperty(target, key, r), r;
-};
-var __metadata = (this && this.__metadata) || function (k, v) {
-    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
-};
-// 访问器装饰器，Accessor Decorator
-var Point = /** @class */ (function () {
-    function Point(x, y) {
-        this._x = x;
-        this._y = y;
-    }
-    Object.defineProperty(Point.prototype, "x", {
-        get: function () { return this._x; },
-        enumerable: true,
-        configurable: true
-    });
-    Object.defineProperty(Point.prototype, "y", {
-        get: function () { return this._y; },
-        enumerable: true,
-        configurable: true
-    });
-    __decorate([
-        configurable(false),
-        __metadata("design:type", Object),
-        __metadata("design:paramtypes", [])
-    ], Point.prototype, "x", null);
-    __decorate([
-        configurable(false),
-        __metadata("design:type", Object),
-        __metadata("design:paramtypes", [])
-    ], Point.prototype, "y", null);
-    return Point;
-}());
-function configurable(value) {
-    return function (target, propertyKey, descriptor) {
-        descriptor.configurable = value;
-    };
-}
diff --git a/dist/metadata.js b/dist/metadata.js
deleted file mode 100644
index 593f113..0000000
--- a/dist/metadata.js
+++ /dev/null
@@ -1,56 +0,0 @@
-"use strict";
-var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
-    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
-    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
-    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
-    return c > 3 && r && Object.defineProperty(target, key, r), r;
-};
-var __metadata = (this && this.__metadata) || function (k, v) {
-    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
-};
-Object.defineProperty(exports, "__esModule", { value: true });
-require("reflect-metadata");
-var Point = /** @class */ (function () {
-    function Point() {
-    }
-    return Point;
-}());
-var Line = /** @class */ (function () {
-    function Line() {
-    }
-    Object.defineProperty(Line.prototype, "p0", {
-        get: function () { return this._p0; },
-        set: function (value) { this._p0 = value; },
-        enumerable: true,
-        configurable: true
-    });
-    Object.defineProperty(Line.prototype, "p1", {
-        get: function () { return this._p1; },
-        set: function (value) { this._p1 = value; },
-        enumerable: true,
-        configurable: true
-    });
-    __decorate([
-        validate,
-        __metadata("design:type", Point),
-        __metadata("design:paramtypes", [Point])
-    ], Line.prototype, "p0", null);
-    __decorate([
-        validate,
-        __metadata("design:type", Point),
-        __metadata("design:paramtypes", [Point])
-    ], Line.prototype, "p1", null);
-    return Line;
-}());
-function validate(target, propertyKey, descriptor) {
-    var set = descriptor.set;
-    descriptor.set = function (value) {
-        var type = Reflect.getMetadata("design:type", target, propertyKey);
-        if (!(value instanceof type)) {
-            throw new TypeError("无效的类型。");
-        }
-        set(value);
-    };
-}
-var l1 = new Line();
-console.log(l1);
diff --git a/dist/mixins_example.js b/dist/mixins_example.js
deleted file mode 100644
index 1831510..0000000
--- a/dist/mixins_example.js
+++ /dev/null
@@ -1,47 +0,0 @@
-// 一个名为 Disposable 的混入
-var Disposable = /** @class */ (function () {
-    function Disposable() {
-    }
-    Disposable.prototype.dispose = function () {
-        this.isDisposable = true;
-    };
-    return Disposable;
-}());
-// 一个名为 Activatable 的混入
-var Activatable = /** @class */ (function () {
-    function Activatable() {
-    }
-    Activatable.prototype.activate = function () {
-        this.isActive = true;
-    };
-    Activatable.prototype.deactivate = function () {
-        this.isActive = false;
-    };
-    return Activatable;
-}());
-var SmartObject = /** @class */ (function () {
-    function SmartObject() {
-        var _this = this;
-        // Disposable
-        this.isDisposable = false;
-        // Activatable
-        this.isActive = false;
-        setInterval(function () {
-            console.log(_this.isActive + " : " + _this.isDisposable);
-        }, 500);
-    }
-    SmartObject.prototype.interact = function () {
-        this.activate();
-    };
-    return SmartObject;
-}());
-applyMixins(SmartObject, [Disposable, Activatable]);
-var smartObj = new SmartObject();
-setTimeout(function () { return smartObj.interact(); }, 1000);
-function applyMixins(derivedCtor, baseCtors) {
-    baseCtors.forEach(function (baseCtor) {
-        Object.getOwnPropertyNames(baseCtor.prototype).forEach(function (name) {
-            derivedCtor.prototype[name] = baseCtor.prototype[name];
-        });
-    });
-}
diff --git a/dist/parameter_decorators.js b/dist/parameter_decorators.js
deleted file mode 100644
index 97fa868..0000000
--- a/dist/parameter_decorators.js
+++ /dev/null
@@ -1,54 +0,0 @@
-"use strict";
-var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
-    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
-    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
-    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
-    return c > 3 && r && Object.defineProperty(target, key, r), r;
-};
-var __metadata = (this && this.__metadata) || function (k, v) {
-    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
-};
-var __param = (this && this.__param) || function (paramIndex, decorator) {
-    return function (target, key) { decorator(target, key, paramIndex); }
-};
-Object.defineProperty(exports, "__esModule", { value: true });
-require("reflect-metadata");
-var Greeter = /** @class */ (function () {
-    function Greeter(message) {
-        this.greeting = message;
-    }
-    Greeter.prototype.greet = function (name) {
-        return "Hello " + name + ", " + this.greeting;
-    };
-    __decorate([
-        validate,
-        __param(0, required),
-        __metadata("design:type", Function),
-        __metadata("design:paramtypes", [String]),
-        __metadata("design:returntype", void 0)
-    ], Greeter.prototype, "greet", null);
-    return Greeter;
-}());
-var requiredMetadataKey;
-function required(target, propertyKey, parameterIndex) {
-    var existingRequiredParameters = Reflect.getOwnMetadata(requiredMetadataKey, target, propertyKey) || [];
-    existingRequiredParameters.push(parameterIndex);
-    Reflect.defineMetadata(requiredMetadataKey, existingRequiredParameters, target, propertyKey);
-}
-function validate(target, propertyName, descriptor) {
-    var method = descriptor.value;
-    descriptor.value = function () {
-        var requiredParameters = Reflect.getOwnMetadata(requiredMetadataKey, target, propertyName);
-        if (requiredParameters) {
-            for (var _i = 0, requiredParameters_1 = requiredParameters; _i < requiredParameters_1.length; _i++) {
-                var parameterIndex = requiredParameters_1[_i];
-                if (parameterIndex >= arguments.length || arguments[parameterIndex] === undefined) {
-                    throw new Error("缺少需要的参数。");
-                }
-            }
-        }
-        return method.apply(this, arguments);
-    };
-}
-var g = new Greeter("早上好");
-console.log(g.greet("Echo Feng"));
diff --git a/dist/property_decorators.js b/dist/property_decorators.js
deleted file mode 100644
index eff2f32..0000000
--- a/dist/property_decorators.js
+++ /dev/null
@@ -1,36 +0,0 @@
-"use strict";
-var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
-    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
-    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
-    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
-    return c > 3 && r && Object.defineProperty(target, key, r), r;
-};
-var __metadata = (this && this.__metadata) || function (k, v) {
-    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
-};
-Object.defineProperty(exports, "__esModule", { value: true });
-require("reflect-metadata");
-// 属性装饰器，property decorator
-var Greeter = /** @class */ (function () {
-    function Greeter(message) {
-        this.greeting = message;
-    }
-    Greeter.prototype.greet = function () {
-        var formatString = getFormat(this, "greeting");
-        return formatString.replace("%s", this.greeting);
-    };
-    __decorate([
-        format("Hello, %s"),
-        __metadata("design:type", String)
-    ], Greeter.prototype, "greeting", void 0);
-    return Greeter;
-}());
-var formatMetadataKey;
-function format(formatString) {
-    return Reflect.metadata(formatMetadataKey, formatString);
-}
-function getFormat(target, propertyKey) {
-    return Reflect.getMetadata(formatMetadataKey, target, propertyKey);
-}
-var g = new Greeter("彭海林");
-console.log(g.greet());
diff --git a/dist/reference.lib.js b/dist/reference.lib.js
deleted file mode 100644
index 9b47758..0000000
--- a/dist/reference.lib.js
+++ /dev/null
@@ -1,2 +0,0 @@
-/// <reference lib="es2017.string" />
-console.log("foo".padStart(4));
diff --git a/dist/symbol.js b/dist/symbol.js
deleted file mode 100644
index 89de993..0000000
--- a/dist/symbol.js
+++ /dev/null
@@ -1,2 +0,0 @@
-var a;
-console.log(a);