bitgo/webpack.config.js

BitGo JavaScript SDK

const path = require('path');
const fs = require('fs');
const HTMLWebpackPlugin = require('html-webpack-plugin');
const mode = process.env.NODE_ENV ?? 'production';
const { mergeWith } = require('lodash');
const bitgoConfig = require('../../webpack/bitgojs.config');
const { mergeCustomizer } = require('../../webpack/mergeCustomizer');

function replaceUnsafeEval(file) {
  const replacementRegex = /Function\("return this"\)\(\)/g;
  const replaceWith = 'window';

  if (!file) {
    throw new Error('must specify webpack bundle file to replace unsafe evals');
  }

  // eslint-disable-next-line no-sync
  if (!fs.existsSync(file)) {
    throw new Error(`bundle file ${file} does not exist`);
  }

  let replacements = 0;

  // eslint-disable-next-line no-sync
  const bundle = fs
    .readFileSync(file)
    .toString('utf8')
    .replace(replacementRegex, () => {
      replacements++;
      return replaceWith;
    });

  // eslint-disable-next-line no-sync
  fs.writeFileSync(file, bundle);

  return replacements;
}

function getOutputFileName() {
  return mode === 'production' ? 'BitGoJS.min.js' : 'BitGoJS.js';
}

module.exports = mergeWith(
  {
    mode,
    target: 'web',
    entry: path.join(__dirname, '/dist/src/index.js'),
    output: {
      path: path.join(__dirname, '/dist/browser'),
      filename: getOutputFileName(),
      library: 'BitGoJS',
      libraryTarget: 'umd',
    },
    plugins: [
      new HTMLWebpackPlugin({ filename: 'browser.html', title: 'BitGo SDK Sandbox' }),
      // This plugin uses webpack's hooks to perform a post processing step to find + replace unsafe code.
      // currently, hashgraph protobufs generated code will attempt resolve the global object with:
      //   Function("return this")()
      // which is not permitted in strict CSP environments. This can safely just be replaced with the *actual* global
      // object, i.e. window
      {
        apply: (compiler) => {
          compiler.hooks.afterEmit.tap('AfterEmitPlugin', () => {
            replaceUnsafeEval(`./dist/browser/${getOutputFileName()}`);
          });
        },
      },
    ],
  },
  bitgoConfig,
  mergeCustomizer
);