4

I am using webpack to bundle up my javascript files.

My Webpack config (which is passed to webpack using gulp) looks like this:

    var webpackConfig = {
        context: __dirname,
        entry: {
            "app": "./js/app.js"
        },
        output: {
            path: path.join(__dirname, ".."),
            filename: "/js/[name].js",
            chunkFilename: "/js/[id].js"
        },
        plugins: [
            new webpack.ResolverPlugin(
                new webpack.ResolverPlugin.DirectoryDescriptionFilePlugin("bower.json", ["main"])
            )
        ],
        resolve: {
            modulesDirectories: ['js', 'bower_components', 'node_modules']
        }
    };

My app.js is a simple require:

require('modernizr/modernizr.js');

Webpack builds the file without any problems and the generated file contains modernizr.

The problem is that when I include the file on a page and test it, modernizr errors out:

TypeError: document is undefined

docElement = document.documentElement,

The bundled file from webpack looks like this:

/******/ (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] = {
/******/            exports: {},
/******/            id: moduleId,
/******/            loaded: false
/******/        };
/******/
/******/        // Execute the module function
/******/        modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/        // Flag the module as loaded
/******/        module.loaded = 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;
/******/
/******/    // __webpack_public_path__
/******/    __webpack_require__.p = "";
/******/
/******/    // Load entry module and return exports
/******/    return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports, __webpack_require__) {

    __webpack_require__(1);

/***/ },
/* 1 */
/***/ function(module, exports, __webpack_require__) {

    /*!
     * Modernizr v2.8.3
     * www.modernizr.com
     *
     * Copyright (c) Faruk Ates, Paul Irish, Alex Sexton
     * Available under the BSD and MIT licenses: www.modernizr.com/license/
     */

    /*
     * Modernizr tests which native CSS3 and HTML5 features are available in
     * the current UA and makes the results available to you in two ways:
     * as properties on a global Modernizr object, and as classes on the
     * <html> element. This information allows you to progressively enhance
     * your pages with a granular level of control over the experience.
     *
     * Modernizr has an optional (not included) conditional resource loader
     * called Modernizr.load(), based on Yepnope.js (yepnopejs.com).
     * To get a build that includes Modernizr.load(), as well as choosing
     * which tests to include, go to www.modernizr.com/download/
     *
     * Authors        Faruk Ates, Paul Irish, Alex Sexton
     * Contributors   Ryan Seddon, Ben Alman
     */

    window.Modernizr = (function( window, document, undefined ) {

        var version = '2.8.3',

        Modernizr = {},

        /*>>cssclasses*/
        // option for enabling the HTML classes to be added
        enableClasses = true,
        /*>>cssclasses*/

        docElement = document.documentElement,

        /** rest of modernizr code here **/

        return Modernizr;

    })(this, this.document);


/***/ }
/******/ ])

What's causing this problem?

4

4 回答 4

3

在 Webpack 2 上，我想我通过{test: /modernizr/, loader: 'imports-loader?this=>window!exports-loader?window.Modernizr'}在我的module.rules.

请参阅此处提交的此 Webpack 错误：https ://github.com/webpack/webpack/issues/512#issuecomment-288143187

于 2017-03-21T16:52:37.423 回答
1

这个问题是由 Modernizr 传递this.document给它创建的闭包引起的。不幸的是，webpack 将所有这些包装在它自己的另一个闭包中，导致this.document返回null。

该问题可以通过在需要时this使用导入加载器进行设置来解决：

require('imports?this=>window!modernizr/modernizr.js');
于 2014-11-13T07:45:27.930 回答
1

我有同样的问题，但不直接需要 Modernizr。我需要一个包含 Modernizr 的库。较早的解决方案在这种情况下不起作用。我最终最终使用了script-loader：

require('script!package/vendor-bundle.js);
于 2015-09-24T19:59:04.550 回答
0

在 Webpack 配置文件中添加了这个：

module: {
    ...
    loaders: [
        ...
        { test: /[\\\/]modernizr dependecie path[\\\/]modernizr\.js$/,
            loader: "imports?this=>window!exports?window.Modernizr" }
        ...
    ]
}

为此，您需要安装imports-loaderand exports-loader。

于 2018-08-17T08:52:06.667 回答