[英]Configuring library as external in webpack does not work with UMD as libraryTarget
I tried this the last two days and I can't get it to work like expected: I want to build my own JavaScript library and register it under an already existing namespace ("OCA" - in this particular case).我在过去两天尝试了这个,但我无法让它像预期的那样工作:我想构建我自己的 JavaScript 库并将它注册到一个已经存在的命名空间(“OCA” - 在这种特殊情况下)。 And as you might understand, I don't want to be forced to go without modern approaches like type safety through typescript or modules.
正如您可能理解的那样,我不想被迫放弃现代方法,例如通过打字稿或模块进行类型安全。
Therefore I use webpack 2 and the libraryTarget: umd
to register the output under "OCA.Ocr" (my library is named "Ocr").因此,我使用webpack 2和
libraryTarget: umd
在“OCA.Ocr”下注册输出(我的库名为“Ocr”)。 This works like intended, but when it comes to the point that I want to use for example underscorejs , as it will be available globally in the application the library should be also delivered to, I cannot get it to work.这像预期的那样工作,但是当涉及到我想要使用的点时,例如underscorejs ,因为它将在应用程序中全局可用,库也应该交付给,我无法让它工作。 I followed the webpack configuration documentation and it says that the externals configuration option should be the way to go:
我遵循了 webpack 配置文档,它说externals配置选项应该是要走的路:
externals: { // object
angular: "this angular", // this["angular"]
react: { // UMD
commonjs: "react",
commonjs2: "react",
amd: "react",
root: "React"
}
}
// Don't follow/bundle these modules, but request them at runtime from the environment
I used it like proposed by the guide but it doesn't work:我按照指南的建议使用它,但它不起作用:
/* global __dirname, require, module*/
const webpack = require("webpack");
const UglifyJsPlugin = webpack.optimize.UglifyJsPlugin;
const path = require("path");
module.exports = function (env) {
let target = env.target;
let libraryName = ["OCA", "Ocr"];
let plugins = [];
let outputFile;
if (target === "production") {
plugins.push(new UglifyJsPlugin({ minimize: true }));
}
outputFile = "ocr[name].min.js";
const config = {
entry: {
app: __dirname + "/src/app.ts",
personal: __dirname + "/src/personal.ts"
},
output: {
path: __dirname + "/dist",
filename: outputFile,
library: libraryName,
libraryTarget: "umd",
umdNamedDefine: true
},
module: {
rules: [
{
test: /\.ts$/,
enforce: "pre",
loader: "tslint-loader",
options: {
tsConfigFile: "tsconfig.app.json",
}
},
{
test: /\.ts?$/,
loader: "ts-loader",
exclude: /node_modules/,
options: {
configFileName: "tsconfig.app.json"
}
}
],
},
resolve: {
modules: [path.resolve("./src")],
extensions: [".ts"],
},
externals: {
underscore: { // UMD
commonjs: "underscore",
commonjs2: "underscore",
amd: "underscore",
root: "_"
}
},
plugins: plugins,
};
return config;
}
My app.ts
file which uses the underscore library (for example the _.defer
method, which of course is not always the best to use) looks like that:我的
app.ts
文件使用下划线库(例如_.defer
方法,当然并不总是最好使用)看起来像这样:
import _ from 'underscore';
export class App {
constructor() {
_.defer(() => {
console.log('test');
});
}
}
export let $app: App = new App();
I included it in the application and also checked that the underscorejs library is getting loaded before my lib gets loaded by the browser, but the console output still states:我将它包含在应用程序中,并在浏览器加载我的库之前检查了 underscorejs 库是否已加载,但控制台输出仍然指出:
TypeError: underscore_1.default is undefined
类型错误:underscore_1.default 未定义
The compiled output is the following (maybe this helps a little bit):编译后的输出如下(也许这有点帮助):
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory(require("underscore"));
else if(typeof define === 'function' && define.amd)
define("Ocr", ["underscore"], factory);
else if(typeof exports === 'object')
exports["Ocr"] = factory(require("underscore"));
else
root["OCA"] = root["OCA"] || {}, root["OCA"]["Ocr"] = factory(root["_"]);
})(this, function(__WEBPACK_EXTERNAL_MODULE_1__) {
return /******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/
/******/ // Check if module is in cache
/******/ 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: {}
/******/ };
/******/
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ // Flag the module as loaded
/******/ module.l = true;
/******/
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/
/******/
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/
/******/ // identity function for calling harmony imports with the correct context
/******/ __webpack_require__.i = function(value) { return value; };
/******/
/******/ // define getter function for harmony exports
/******/ __webpack_require__.d = function(exports, name, getter) {
/******/ if(!__webpack_require__.o(exports, name)) {
/******/ Object.defineProperty(exports, name, {
/******/ configurable: false,
/******/ enumerable: true,
/******/ get: getter
/******/ });
/******/ }
/******/ };
/******/
/******/ // getDefaultExport function for compatibility with non-harmony modules
/******/ __webpack_require__.n = function(module) {
/******/ var getter = module && module.__esModule ?
/******/ function getDefault() { return module['default']; } :
/******/ function getModuleExports() { return module; };
/******/ __webpack_require__.d(getter, 'a', getter);
/******/ return getter;
/******/ };
/******/
/******/ // Object.prototype.hasOwnProperty.call
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
/******/
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/
/******/ // Load entry module and return exports
/******/ return __webpack_require__(__webpack_require__.s = 2);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */,
/* 1 */
/***/ (function(module, exports) {
module.exports = __WEBPACK_EXTERNAL_MODULE_1__;
/***/ }),
/* 2 */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var underscore_1 = __webpack_require__(1);
var App = (function () {
function App() {
underscore_1.default.defer(function () {
console.log('test');
});
}
return App;
}());
exports.App = App;
exports.$app = new App();
/***/ })
/******/ ]);
});
Does anyone know how this is working and what I will have to do?有谁知道这是如何工作的以及我必须做什么? I am completely lost and now hoping for your help.
我完全迷失了,现在希望得到你的帮助。
I have the same issue as you, however, if you set the property var in the libraryTarget option, the variable stops being undefined.我和你有同样的问题,但是,如果你在 libraryTarget 选项中设置属性 var,变量将停止未定义。 Maybe this will help you:
也许这会帮助你:
externals: {
"lodash": {
var:'_'
}
}
You have 2 options here.您在这里有 2 个选择。 I recommend option #1.
我推荐选项#1。
In fact, if you use UMD
and plan on supporting node
(in addition to commonjs, amd, and browser), always set globalObject: 'this'
事实上,如果你使用
UMD
并计划支持node
(除了commonjs、amd和browser),总是设置globalObject: 'this'
output.globalObject
to this
, and use externals.root
.output.globalObject
设置this
,并使用externals.root
。const config = {
output: {
library: libraryName,
libraryTarget: "umd",
globalObject: 'this' // <-- THIS IS THE IMPORTANT LINE FOR UMD+NODE
},
externals: {
underscore: { // UMD
commonjs: "underscore",
commonjs2: "underscore",
amd: "underscore",
root: "_"
}
},
};
output.globalObject output.globalObject
When targeting a library, especially when the libraryTarget is 'umd', this option indicates what global object will be used to mount the library.当以库为目标时,尤其是当 libraryTarget 为 'umd' 时,此选项指示将使用哪个全局对象来挂载库。 To make UMD build available on both browsers and Node.js, set output.globalObject option to 'this'.
要使 UMD 构建在浏览器和 Node.js 上都可用,请将 output.globalObject 选项设置为“this”。
externals.var
instead of externals.root
.externals.var
而不是externals.root
。
externals: {
underscore: { // UMD
commonjs: "underscore",
commonjs2: "underscore",
amd: "underscore",
var: "_"
}
},
This is a workaround and does not require setting globalObject: 'this'
这是一种解决方法,不需要设置
globalObject: 'this'
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