move-script.js

const fs = require("fs");

const bundle = fs.readFileSync("path-to-webpack-bundle.html", "utf8");

const escaped = JSON.stringify(bundle);
const js = `export default ${escaped}`;

fs.writeFileSync("javascript-output-file.ts", js);

webpack.config.ts

import { Configuration } from "webpack";
import { resolve } from "path";
import * as HtmlWebpackPlugin from "html-webpack-plugin";
import * as HtmlWebpackInlineSourcePlugin from "html-webpack-inline-source-plugin";
declare var __dirname;

const config: Configuration = {
  entry: "./src/index.ts",
  output: {
    path: resolve(__dirname, "dist"),
    filename: "bundle.js"
  },
  resolve: {
    alias: {
      fabric: resolve(__dirname, "fabric.min.js")
    },
    extensions: [".ts", ".js"]
  },
  module: {
    rules: [
      { test: /\.ts$/, loader: "ts-loader" },
      { test: /\.css$/, use: ["style-loader", "css-loader"] },
      { test: /\.scss$/, use: ["style-loader", "css-loader", "sass-loader"] },
      {
        test: /\.(jpe?g|png|ttf|eot|svg|woff(2)?)(\?[a-z0-9=&.]+)?$/,
        use: "base64-inline-loader?limit=1000&name=[name].[ext]"
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      meta: {
        viewport: "initial-scale=1, maximum-scale=1"
      },
      inlineSource: ".(js|css)$"
    }),
    new HtmlWebpackInlineSourcePlugin()
  ]
};

export default config;

Great job!