How to use the @blueprintjs/webpack-build-scripts.baseConfig.plugins function in @blueprintjs/webpack-build-scripts

// we override module rules since we don't want file-loader to be triggered for inline SVGs
    module: {
        rules: baseConfig.module.rules.slice(0, 2).concat([
            {
                test: /^((?!svgs).)*\.(eot|ttf|woff|woff2|svg|png)$/,
                loader: require.resolve("file-loader"),
            },
        ]),
    },

    output: {
        filename: "[name].js",
        path: path.resolve(__dirname, "./dist"),
    },

    plugins: baseConfig.plugins.concat([
        new CopyWebpackPlugin([
            // to: is relative to dist/
            { from: "src/assets", to: "assets" },
            { from: "src/index.html", to: "." },
        ])
    ]),
});

features: [
             "./src/index.scss",
             "./src/features.tsx",
         ],
         index: [
             "./src/index.scss",
             "./src/index.tsx",
         ],
    },

    output: {
        filename: "[name].bundle.js",
        path: path.resolve(__dirname, "./dist"),
    },

    plugins: baseConfig.plugins.concat([
        new CopyWebpackPlugin([
            // to: is relative to dist/
            { from: "src/index.html", to: "." },
            { from: "src/features.html", to: "." },
        ])
    ]),
});

const path = require("path");

module.exports = Object.assign({}, baseConfig, {
    entry: {
        "docs-app": [
            "./src/index.tsx",
            "./src/index.scss"
        ],
    },

    output: {
        filename: "[name].js",
        path: path.resolve(__dirname, "./dist"),
    },

    plugins: baseConfig.plugins.concat([
        new CopyWebpackPlugin([
            // to: is relative to dist/
            { from: "src/index.html", to: "." },
            { from: "src/assets/favicon.png", to: "assets" },
        ])
    ]),
});