捆绑时力矩未定义

我正在尝试捆绑moment.js,但捆绑后它一直未定义:

var path = require("path");
var webpack = require("webpack");

module.exports = {
    mode: "development",
    entry: {
        frb: "./src/app/loader.js"
    },
    output: {
        path: path.resolve(__dirname, "./src/lib"),
        filename: "bundle.js"
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                exclude: /(node_modules)/,
                loader: "babel-loader",
                query: {
                    presets: [
                        [
                            "@babel/preset-env",
                            {
                                targets: {
                                    chrome: "58",
                                    ie: "9"
                                }
                            }
                        ]
                    ]
                }
            }
        ]
    },
    plugins: [
        // Ignore all locale files of moment.js
        new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
        new webpack.ProvidePlugin({
            moment: "moment"
        })
    ]
};

我的loader.js只是:

require("moment")