手动编译ts的经过
动机
以前写ts或者es6，都是用在脚手架搭建的项目中，比如vue和react，当时当我识图写一个ts的demo的，我还要创建一个完整的vue或者react项目？明显不合适，那就要研究一下如何手动搭建一套编译调试环境
源代码
src/index.ts
/*因为编译后的代码包含es6新增api，比如下边的includes，有浏览器可能不支持，故而需要引入垫片
这里可以选择core-js，也可以ts-polyfill，目的都是一样的*/
import 'core-js'; //具体目标
class Utils {
protected cname:string = 'Utils';
public test(): void{
[1,2,3].includes(2)
}
}
(window as any).subject = new Utils(); //方便页面使用
方案1：tsc编译+手动做垫片+webpack处理模块
使用tsc编译
tsconfig.json配置如下
{
"compilerOptions": {
"target": "es5", /* 编译的目标是什么版本的 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
"module": "commonjs",/* 编译后模块化类型 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
"lib": [ //编译过程中需要引入的库文件的列表。
"es5",
"es2016.array.include",
"dom" //因为ts内用到了window
],
"strict": true,
"esModuleInterop": true
}
}
运行tsc命令后，编译后的代码src/index.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
// import 'core-js';
require("ts-polyfill/lib/es2016-array-include");
//具体目标
var Utils = /** @class */ (function () {
function Utils() {
this.cname = 'Utils';
}
Utils.prototype.test = function () {
[1, 2, 3].includes(2);
};
return Utils;
}());
window.subject = new Utils(); //方便页面使用
可以从代码中看到，tsc只是将ts代码编译js代码。有两个问题仍然需要我们处理，
他不管浏览器对编译后的js代码的兼容如何，所以我们需要手动做垫片，所以我们在入口文件src/index.ts处已经引入了coreJs做了垫片
然后他不处理模块化代码部分，比如import，export。目前node直接使用没问题，但是如果放在浏览器，2019年年底浏览器均不支持，所以需要webpack进行模块化处理。
我们将项目中安装webpack，并添加配置文件npm install --save-dev webpack webpack-cli
const path = require('path');
module.exports = {
mode: 'development',
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'main.js'
}
};
然后通过webpack命令webpack --mode development --progress来打包处理模块化,编译成功后的代码会很长，这里就不直接展开了。
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/******/
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/******/ if(installedModules[moduleId]) {
/******/ return installedModules[moduleId].exports;
/******/ }
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ i: moduleId,
/******/ l: false,
/******/ exports: {}
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/******/
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
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/******/ module.l = true;
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/******/ return module.exports;
/******/ }
/******/
/******/
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
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/******/ __webpack_require__.c = installedModules;
/******/
/******/ // define getter function for harmony exports
/******/ __webpack_require__.d = function(exports, name, getter) {
/******/ if(!__webpack_require__.o(exports, name)) {
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/******/ return getter;
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/******/
/******/ // Object.prototype.hasOwnProperty.call
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
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/***/ (function(module, exports, __webpack_require__) {
eval("var DESCRIPTORS = __webpack_require__(/*! ../internals/descriptors */ \"./node_modules/core-js/internals/descriptors.js\");\nvar propertyIsEnumerableModule = __webpack_require__(/*! ../internals/object-property-is-enumerable */ \"./node_modules/core-js/internals/object-property-is-enumerable.js\");\nvar createPropertyDescriptor = __webpack_require__(/*! ../internals/create-property-descriptor */ \"./node_modules/core-js/internals/create-property-descriptor.js\");\nvar toIndexedObject = __webpack_require__(/*! ../internals/to-indexed-object */ \"./node_modules/core-js/internals/to-indexed-object.js\");\nvar toPrimitive = __webpack_require__(/*! ../internals/to-primitive */ \"./node_modules/core-js/internals/to-primitive.js\");\nvar has = __webpack_require__(/*! ../internals/has */ \"./node_modules/core-js/internals/has.js\");\nvar IE8_DOM_DEFINE = __webpack_require__(/*! ../internals/ie8-dom-define */ \"./node_modules/core-js/internals/ie8-dom-define.js\");\n\nvar nativeGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// `Object.getOwnPropertyDescriptor` method\n// https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptor\nexports.f = DESCRIPTORS ? nativeGetOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {\n O = toIndexedObject(O);\n P = toPrimitive(P, true);\n if (IE8_DOM_DEFINE) try {\n return nativeGetOwnPropertyDescriptor(O, P);\n } catch (error) { /* empty */ }\n if (has(O, P)) return createPropertyDescriptor(!propertyIsEnumerableModule.f.call(O, P), O[P]);\n};\n\n\n//# sourceURL=webpack:///./node_modules/core-js/internals/object-get-own-property-descriptor.js?");
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/***/ (function(module, exports, __webpack_require__) {
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/*!***************************************************************************!*\
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/***/ (function(module, exports, __webpack_require__) {
eval("var has = __webpack_require__(/*! ../internals/has */ \"./node_modules/core-js/internals/has.js\");\nvar toObject = __webpack_require__(/*! ../internals/to-object */ \"./node_modules/core-js/internals/to-object.js\");\nvar sharedKey = __webpack_require__(/*! ../internals/shared-key */ \"./node_modules/core-js/internals/shared-key.js\");\nvar CORRECT_PROTOTYPE_GETTER = __webpack_require__(/*! ../internals/correct-prototype-getter */ \"./node_modules/core-js/internals/correct-prototype-getter.js\");\n\nvar IE_PROTO = sharedKey('IE_PROTO');\nvar ObjectPrototype = Object.prototype;\n\n// `Object.getPrototypeOf` method\n// https://tc39.github.io/ecma262/#sec-object.getprototypeof\nmodule.exports = CORRECT_PROTOTYPE_GETTER ? Object.getPrototypeOf : function (O) {\n O = toObject(O);\n if (has(O, IE_PROTO)) return O[IE_PROTO];\n if (typeof O.constructor == 'function' && O instanceof O.constructor) {\n return O.constructor.prototype;\n } return O instanceof Object ? ObjectPrototype : null;\n};\n\n\n//# sourceURL=webpack:///./node_modules/core-js/internals/object-get-prototype-of.js?");
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/***/ (function(module, exports, __webpack_require__) {
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/***/ (function(module, exports, __webpack_require__) {
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eval("\nvar nativePropertyIsEnumerable = {}.propertyIsEnumerable;\nvar getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// Nashorn ~ JDK8 bug\nvar NASHORN_BUG = getOwnPropertyDescriptor && !nativePropertyIsEnumerable.call({ 1: 2 }, 1);\n\n// `Object.prototype.propertyIsEnumerable` method implementation\n// https://tc39.github.io/ecma262/#sec-object.prototype.propertyisenumerable\nexports.f = NASHORN_BUG ? function propertyIsEnumerable(V) {\n var descriptor = getOwnPropertyDescriptor(this, V);\n return !!descriptor && descriptor.enumerable;\n} : nativePropertyIsEnumerable;\n\n\n//# sourceURL=webpack:///./node_modules/core-js/internals/object-property-is-enumerable.js?");
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/***/ (function(module, exports, __webpack_require__) {
eval("var anObject = __webpack_require__(/*! ../internals/an-object */ \"./node_modules/core-js/internals/an-object.js\");\nvar aPossiblePrototype = __webpack_require__(/*! ../internals/a-possible-prototype */ \"./node_modules/core-js/internals/a-possible-prototype.js\");\n\n// `Object.setPrototypeOf` method\n// https://tc39.github.io/ecma262/#sec-object.setprototypeof\n// Works with __proto__ only. Old v8 can't work with null proto objects.\n/* eslint-disable no-proto */\nmodule.exports = Object.setPrototypeOf || ('__proto__' in {} ? function () {\n var CORRECT_SETTER = false;\n var test = {};\n var setter;\n try {\n setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;\n setter.call(test, []);\n CORRECT_SETTER = test instanceof Array;\n } catch (error) { /* empty */ }\n return function setPrototypeOf(O, proto) {\n anObject(O);\n aPossiblePrototype(proto);\n if (CORRECT_SETTER) setter.call(O, proto);\n else O.__proto__ = proto;\n return O;\n };\n}() : undefined);\n\n\n//# sourceURL=webpack:///./node_modules/core-js/internals/object-set-prototype-of.js?");
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将编译后的文件直接通过script的方式引入页面，就可以使用了
<body>
<script src="./dist/main.js"></script>
</body>
缺点：垫片要手动处理，不智能。用到了两个工具
方案二：ts编译+babel接手垫片+webpack模块化
我们源代码需要改动一下，删除头部引入coreJs，我们不需要手动做垫片
//具体目标
class Utils {
protected cname:string = 'Utils';
public test(): void{
[1,2,3].includes(2)
}
}
(window as any).subject = new Utils(); //方便页面使用
仍旧是ts编译，可以看到编译后src/index.js的代码，明显也少了引入垫片corejs这行代码
"use strict";
//具体目标
var Utils = /** @class */ (function () {
function Utils() {
this.cname = 'Utils';
}
Utils.prototype.test = function () {
[1, 2, 3].includes(2);
};
return Utils;
}());
window.subject = new Utils(); //方便页面使用
安装babel，让babel处理垫片。创建babel配置文件babel.config.js
装babel的时候让我惊讶的是，不用安装@babel/polyfill也能(babel)编译和(webpack)模块打包成功，分析了下原因:
1、编译阶段是不需要垫片的，因为此时编译后的文件只是多出来了垫片的引用，是否找得到编译器它不考虑
2、垫片的使用时发生在用webpack打包阶段，因为他要处理垫片生成的import，import的内容就是垫片库@babel/polyfill里的文件，如果你没有安装此包webpack处理的时候找不到会报错
3、至于我为啥后边webpack成功了，是因为我刚才误多装了core-js包，而这个包恰恰就是我需要的垫片包，
因为我的babel是7.4以上，@babel/polyfill已经被废弃了被分解成了core-js、regenerator-runtime两个包，刚好歪打正着。所以我们可以提前安装上这两个包，不然webpack打包阶段会报错
const presets = [
[
"@babel/env",
{
useBuiltIns: "usage" //自动按需引入对应的垫片
},
],
];
module.exports = { presets };
执行babel打包命令npx babel src/index.js --out-dir src，打包后的src/index.js有看到babel已经帮我们处理好了垫片环境
"use strict"; //具体目标
require("core-js/modules/es7.array.includes");
require("core-js/modules/es6.string.includes");
var Utils =
/** @class */
function () {
function Utils() {
this.cname = 'Utils';
}
Utils.prototype.test = function () {
[1, 2, 3].includes(2);
};
return Utils;
}();
window.subject = new Utils(); //方便页面使用
然后我们再用webpack处理模块化webpack --mode development --progress。然后他妈的就报错了
ERROR in ./src/index.js
Module not found: Error: Can't resolve 'core-js/modules/es6.string.includes' in '/Users/dsh/Documents/demo/tsceg/src'
@ ./src/index.js 5:0-46
ERROR in ./src/index.js
Module not found: Error: Can't resolve 'core-js/modules/es7.array.includes' in '/Users/dsh/Documents/demo/tsceg/src'
@ ./src/index.js 3:0-45
我仔细的瞅了瞅node-module下边的core-js包，发现包里的moduels下就没有es6.string.includes和es7.array.includes这两个文件。我跑到github下找到这货的项目，看了看v3确实没有，但是v2还有，那看来就是第一种方案的时候，手动装垫片的时候，coreJs的版本默认给我装到v3。简言之，版本装错了，重新改成v2后就好了，一下是打包后的文件，就不展开了
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缺点：虽然编译成了老版本的js和做了垫片，但是却多用了一个工具babel，现在是一工3个工具
方案三：只用webpack(ts-loader + babel-loader)
webpack的优秀之处在于，他能以loader和plugin的方式将其他工具整个到自身内。那么我们分别用ts-loader和babel-loader来仅用webpack去处理ts。避免了使用过多的工具的问题。
新建一个项目，
初始化node配置文件自动生成packge.json。
安装webpack，并新增配置文件。
新增入口文件src/index.ts
测试页面引入编译后的dist/main.js文件，别的内容没有
目录解构如下：
1、安装ts-loader，主要分4部分
npm install ts-loader typescript --save-dev
安装ts-loader
安装typescript
新增tsconfig.json,配置文件内容如上（当然也可以像下边babel配置文件的方式一样，只是懒得重复演示）
配置webpack对ts的loader规则，具体文件下边一起放出
2、安装babel-loader
其实这个时候，执行webpack就可以将ts编译为js了，但是为了兼容老的浏览器，我们要用babel来做垫片
安装babel核心库和babel-loader以及babel欲设
npm install -D babel-loader @babel/core @babel/preset-env
另外就是垫片包了，babel7.4以上，@babel/polylill已经被启用了，代替他的是core-js、regenerator-runtime这两个包，记得安装
npm install -D core-js regenerator-runtime
然后把babel的配置转移到webpack的配置文件里就行，无需额外的配置文件
const path = require('path');
module.exports = {
mode: 'development',
entry: ['./src/index.ts'],
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'main.js'
},
module: {
rules: [
{ test: /\.ts$/,use: [
{
loader: 'babel-loader',
options: {
presets: [
[
'@babel/preset-env',
{
"useBuiltIns": "usage",
"corejs": 3,
"targets": {"browsers":["> 1%"]},
}
]
],
// 我是真搞不懂这厮，编译现在不用它也不会报错，同学们视情况而定吧，报错用
// 我认为可能是ts-loader已经给处理了类的实例属性，所以交付给babel-loader的时候，就不会有解析不过的问题了
// plugins:[
// ["@babel/plugin-proposal-class-properties", { "loose": true }]
// ]
}
},
{loader: 'ts-loader'}
]}
]
}
};
这里有详细的关于匹配多个loader的用法
3、然后直接用webpack进行编译就行了
npx webpack --config webpack.config.js
优点在于一口气配置完后，只需要一个命令行就编译打包完。
对了提一下配置，如果用了ts-loader和babel-loader，
在tsconfig的配置中，尽量不要处理模块化，编译的语法也不要设置成比较低的es版本。因为后续babel会做。这是哪个老外告诉我的
esnext是指es最新的标准，ts是es基础上加了类型，target esnext基本就等于是ts只做类型检查，然后去掉类型标注得到es代码
缺点：虽然只用了一个工具，但是却用了两个loader，ts-loader和babel-loader，需要两个工具的安装 引入和配置
方案四：只用webpack(里边只用babel-loader)
现在新版的babel可以直接处理ts文件了，那么相应的的babel-loader也能处理。所以我们都可以省去一步，或者省掉一个loader，只用增加配置babel-loader就搞定
要想让babel-loader支持ts解析，那么需要安装一个插件@babel/preset-typescript，然后在修改配置文件webpack.config.js如下
const path = require('path');
module.exports = {
mode: 'development',
entry: ['./src/index.ts'],
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'main.js'
},
module: {
rules: [
{ test: /\.js$|.ts$/, loader: "babel-loader",exclude: /node_modules/,
options: {
presets: [
[
'@babel/preset-env',
{
"useBuiltIns": "usage",
"corejs": 3,
"targets": {"browsers":["> 1%"]},
}
],
["@babel/preset-typescript"]
],
plugins:[
["@babel/plugin-proposal-class-properties", { "loose": true }]
]
}
}
]
}
};
因为我的代码里，有类实例属性定义，目前es6还不支持在类里定义属性，只能定义方法（妈的，刚才试了下，chrome78居然支持了），但估计支持没几年吧
而且@babel/preset-typescript也尚未支持对此的处理（如果用了ts-loader的话，它就给处理了，所以这也是方案三 为啥没装这个插件也可以编译的原因了）
所以编译的时候需要安装一个额外的插件去处理此类语法，@babel/plugin-proposal-class-properties，并加入到如上的配置文件的plugins里。
我好奇，如果是js我定义了类的实例属性，会不会也需要这个插件，果然需要。
所以这个就是用来专门处理js或ts等类的实例属性编译机制的，所以单独拉出来做了个插件。
如果在preset-env和preset-typescript集合里内置了这个插件就好了，我觉得很常用啊，不然还得自己单独去加到plugins里
完事之后在webpack编译。就大工告成啦
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/*!******************************************************************!*\
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/***/ (function(module, exports, __webpack_require__) {
eval("module.exports = __webpack_require__(/*! ./src/index.js */\"./src/index.js\");\n\n\n//# sourceURL=webpack:///multi_./src/index.js?");
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这是我的所有包，仅供参考
{
"name": "wpeg",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"@babel/core": "^7.6.4",
"@babel/plugin-proposal-class-properties": "^7.5.5",
"@babel/preset-env": "^7.6.3",
"@babel/preset-typescript": "^7.6.0",
"babel-loader": "^8.0.6",
"core-js": "^3.3.5",
"regenerator-runtime": "^0.13.3",
"webpack": "^4.41.2",
"webpack-cli": "^3.3.9"
},
"dependencies": {}
}
通过配置文件分析可知，webpack已经不需要ts-loader了，而作为ts-loader的依赖包typescript也自然不需要了，作为ts的配置文件tsconfig.json也可以删除了。这样就省去了大量的ts第三方包和配置
缺点：需要较高版本的babel，但是这个问题会随着时间迎刃而解
babelCli直接编译ts
刚才有提到，babel7可以直接处理ts了，下边就讲一下单独使用babel工具的话，使用步骤？
新建一个空项目，创建src/index.ts后，除了安装如上必须的babel工具之外，还要做如下处理
a：首先要安装一个预设：npm install @babel/preset-typescript -D
b：如果你的类里边就像我的代码一样有类的实例属性，那么还要安装一个支持该特性的插件：
npm install @babel/plugin-proposal-class-properties -D
c：然后创建babel的配置文件babel.config.js
然后运行npx babel src/index.ts --out-dir dist即可
所以最后的结论就是，用一个工具webpack，加一个处理器babel-loader就完全可以搞定ts啦
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