webpack.javascript.js

const { resolve, join  } = require("path");
const fs = require('fs');

const webpack = require("webpack");
const nsWebpack = require("nativescript-dev-webpack");
const nativescriptTarget = require("nativescript-dev-webpack/nativescript-target");
const CopyWebpackPlugin = require("copy-webpack-plugin");
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const { BundleAnalyzerPlugin } = require("webpack-bundle-analyzer");
const { NativeScriptWorkerPlugin } = require("nativescript-worker-loader/NativeScriptWorkerPlugin");


let mainSheet = '';

module.exports = env => {
    const platform = getPlatform(env);

    mainSheet = getMainSheet(platform);

    // Default destination inside platforms/<platform>/...
    const path = resolve(nsWebpack.getAppPath(platform));

    const entry = {
        // Discover entry module from package.json
        bundle: `./${nsWebpack.getEntryModule()}`,

        // Vendor entry with third-party libraries
        vendor: `./vendor`,

        // Entry for stylesheet with global application styles
        [mainSheet]: `./${mainSheet}`,
    };

    const rules = getRules();
    const plugins = getPlugins(platform, env);
    const extensions = getExtensions(platform);

    const config = {
        context: resolve("./app"),
        target: nativescriptTarget,
        entry,
        output: {
            pathinfo: true,
            path,
            libraryTarget: "commonjs2",
            filename: "[name].js",
        },
        resolve: {
            extensions,

            // Resolve {N} system modules from tns-core-modules
            modules: [
                "node_modules/tns-core-modules",
                "node_modules",
            ],

            alias: {
                '~': resolve("./app")
            },

            // This will not follow symlinks to their original location,
            // and will enable us to work with symlinked packages during development.
            symlinks: false
        },
        resolveLoader: {
            // This will not follow symlinks to their original location,
            // and will enable us to work with symlinked loader packages during development.
            symlinks: false
        },
        node: {
            // Disable node shims that conflict with NativeScript
            "http": false,
            "timers": false,
            "setImmediate": false,
            "fs": "empty",
        },
        module: { rules },
        plugins,
    };

    if (env.snapshot) {
        plugins.push(new nsWebpack.NativeScriptSnapshotPlugin({
            chunk: "vendor",
            projectRoot: __dirname,
            webpackConfig: config,
            targetArchs: ["arm", "arm64", "ia32"],
            tnsJavaClassesOptions: { packages: ["tns-core-modules" ] },
            useLibs: false
        }));
    }

    return config;
};


function getMainSheet(platform) {
    const mainSheet = `app.${platform}.css`;
    return fs.existsSync(join(__dirname, 'app', mainSheet)) ?
        mainSheet : 'app.css';
}

function getPlatform(env) {
    return env.android ? "android" :
        env.ios ? "ios" :
        () => { throw new Error("You need to provide a target platform!") };
}

function getRules() {
    return [
        {
            test: /\.html$|\.xml$/,
            use: [
                "raw-loader",
            ]
        },
        // Root stylesheet gets extracted with bundled dependencies
        {
            test: new RegExp(mainSheet),
            use: ExtractTextPlugin.extract([
                {
                    loader: "resolve-url-loader",
                    options: { silent: true },
                },
                {
                    loader: "nativescript-css-loader",
                    options: { minimize: false }
                },
                "nativescript-dev-webpack/platform-css-loader",
            ]),
        },
        // Other CSS files get bundled using the raw loader
        {
            test: /\.css$/,
            exclude: new RegExp(mainSheet),
            use: [
                "raw-loader",
            ]
        },
        // SASS support
        {
            test: /\.scss$/,
            use: [
                "raw-loader",
                "resolve-url-loader",
                "sass-loader",
            ]
        },

    ];
}

function getPlugins(platform, env) {
    let plugins = [
        new ExtractTextPlugin(mainSheet),

        // Vendor libs go to the vendor.js chunk
        new webpack.optimize.CommonsChunkPlugin({
            name: ["vendor"],
        }),

        // Define useful constants like TNS_WEBPACK
        new webpack.DefinePlugin({
            "global.TNS_WEBPACK": "true",
        }),

        // Copy assets to out dir. Add your own globs as needed.
        new CopyWebpackPlugin([
            { from: mainSheet },
            { from: "css/**" },
            { from: "fonts/**" },
            { from: "**/*.jpg" },
            { from: "**/*.png" },
            { from: "**/*.xml" },
        ], { ignore: ["App_Resources/**"] }),

        // Generate a bundle starter script and activate it in package.json
        new nsWebpack.GenerateBundleStarterPlugin([
            "./vendor",
            "./bundle",
        ]),
        
        // Support for web workers since v3.2
        new NativeScriptWorkerPlugin(),

        // Generate report files for bundles content
        new BundleAnalyzerPlugin({
            analyzerMode: "static",
            openAnalyzer: false,
            generateStatsFile: true,
            reportFilename: join(__dirname, "report", `report.html`),
            statsFilename: join(__dirname, "report", `stats.json`),
        }),
    ];

    if (env.uglify) {
        plugins.push(new webpack.LoaderOptionsPlugin({ minimize: true }));

        // Work around an Android issue by setting compress = false
        const compress = platform !== "android";
        plugins.push(new webpack.optimize.UglifyJsPlugin({
            mangle: { except: nsWebpack.uglifyMangleExcludes },
            compress,
        }));
    }

    return plugins;
}

// Resolve platform-specific modules like module.android.js
function getExtensions(platform) {
    return Object.freeze([
        `.${platform}.js`,
        ".js",
        ".css",
        `.${platform}.css`,
    ]);
}