javascript - 由于 Regexp，Webpack 无法编译我的 javascript 文件

Question

我正在使用 Webpack Encore 开发 Symfony 4 项目。使用yarn encore dev，我收到此错误:

ERROR  Failed to compile with 2 errors                                 11:45:38

These dependencies were not found:

* core-js/modules/es.regexp.exec in ./assets/js/poteauxskip.js
* core-js/modules/es.string.match in ./assets/js/poteauxskip.js

To install them, you can run: npm install --save core-js/modules/es.regexp.exec core-js/modules/es.string.match

并且正则表达式不起作用。我尝试按照他们所说的那样安装，但这是各种问题的开始。但主要是，它没有解决主要问题，即:为什么这不起作用？我认为没有理由在我的 javascript 文件中导入任何内容来使用 Regexp，我在整个解决方案研究中没有发现提及这一点。

poteauxskip.js 文件:

const $ = require('jquery');

$(".tableau").addClass("d-none");

$(".serie").change(function(){
    updateTableaux();
});

function updateTableaux() {
    var serie1 = $("select#serie1").val() == '?' ? '[0-9A-F]' : $("select#serie1").val();
    var serie2 = $("select#serie2").val() == '?' ? '[0-9A-F]' : $("select#serie2").val();
    var serie3 = $("select#serie3").val() == '?' ? '[0-9A-F]' : $("select#serie3").val();
    var serie4 = $("select#serie4").val() == '?' ? '[0-9A-F]' : $("select#serie4").val();
    var serie5 = $("select#serie5").val() == '?' ? '[0-9A-F]' : $("select#serie5").val();
    var serie6 = $("select#serie6").val() == '?' ? '[0-9A-F]' : $("select#serie6").val();

    var regex = new Regexp("/" + serie1 + serie2 + serie3 + serie4 + serie5 + serie6 + "$/");

    alert("12".match(regex));
}

如果我测试其他东西，警报就会起作用。如果我在没有任何正则表达式的情况下使用它，其他变量也可以工作。实际上，new Regexp() 或 string.match() 足以导致编译错误。

package.json:

{
  "devDependencies": {
    "@symfony/webpack-encore": "^0.27.0",
    "bootstrap": "^4.3.1",
    "jquery": "^3.4.1",
    "node-sass": "^4.12.0",
    "popper": "^1.0.1",
    "popper.js": "^1.15.0",
    "sass-loader": "^7.0.1",
    "webpack-notifier": "^1.6.0"
  },
  "name": "hyperbolic-world",
  "version": "2.0.0",
  "description": "Pour favoriser l'immersion dans un espace hyperbolique.",
  "main": "index.js",
  "author": "Julien Busset",
  "license": "CC-BY-4.0",
  "directories": {
    "test": "tests"
  }
}

webpack.config.js:

var Encore = require('@symfony/webpack-encore');

Encore
    // directory where compiled assets will be stored
    .setOutputPath('public/build/')
    // public path used by the web server to access the output path
    .setPublicPath('/build')
    // only needed for CDN's or sub-directory deploy
    //.setManifestKeyPrefix('build/')

    /*
     * ENTRY CONFIG
     *
     * Add 1 entry for each "page" of your app
     * (including one that's included on every page - e.g. "app")
     *
     * Each entry will result in one JavaScript file (e.g. app.js)
     * and one CSS file (e.g. app.css) if you JavaScript imports CSS.
     */
    .addEntry('app', './assets/js/app.js')
    .addEntry('poteauxskip', './assets/js/poteauxskip.js')
    //.addEntry('page1', './assets/js/page1.js')
    //.addEntry('page2', './assets/js/page2.js')

    // When enabled, Webpack "splits" your files into smaller pieces for greater optimization.
    .splitEntryChunks()

    // will require an extra script tag for runtime.js
    // but, you probably want this, unless you're building a single-page app
    .enableSingleRuntimeChunk()

    /*
     * FEATURE CONFIG
     *
     * Enable & configure other features below. For a full
     * list of features, see:
     * https://symfony.com/doc/current/frontend.html#adding-more-features
     */
    .cleanupOutputBeforeBuild()
    .enableBuildNotifications()
    .enableSourceMaps(!Encore.isProduction())
    // enables hashed filenames (e.g. app.abc123.css)
    .enableVersioning(Encore.isProduction())

    // enables @babel/preset-env polyfills
    .configureBabel(() => {}, {
        useBuiltIns: 'usage',
        corejs: 3
    })

    // enables Sass/SCSS support
    .enableSassLoader()
    //.addStyleEntry('global', './assets/scss/global.scss')

    // uncomment if you use TypeScript
    //.enableTypeScriptLoader()

    // uncomment to get integrity="..." attributes on your script & link tags
    // requires WebpackEncoreBundle 1.4 or higher
    //.enableIntegrityHashes()

    // uncomment if you're having problems with a jQuery plugin
    //.autoProvidejQuery()

    // uncomment if you use API Platform Admin (composer req api-admin)
    //.enableReactPreset()
    //.addEntry('admin', './assets/js/admin.js')
;

module.exports = Encore.getWebpackConfig();

Answer 1

通过使用 yarn add core-js --dev 添加 core-js 解决了问题。