Migrating a liferay-npm-bundler Project from 1.x to 2.x

You should use the latest 2.x version of the liferay-npm-bundler. It offers more stability and includes more features out-of-the-box. If you already created a project using the 1.x version, don’t worry. Follow these steps to migrate your project to 2.x:

Update the liferay-npm-bundler dependency in your package.json to version 2.x:

{
  "devDependencies": {
    ...
    "liferay-npm-bundler": "^2.0.0",
    ...
  },
  ...
}

Remove all liferay-npm-bundler-preset-* dependencies from your package.json because liferay-npm-bundler 2.x includes these by default.
Remove any bundler presets you configured in your .npmbundlerrc file. liferay-npm-bundler 2.x includes one smart preset that handles all frameworks automatically.

These are the standard requirements that all projects have in common. The remaining steps depend on your project’s framework. Follow the instructions in the corresponding section to finish migrating your project.

Migrating a Plain JavaScript, Billboard JS, JQuery, Metal JS, React, or Vue JS Project

After following the steps covered in the beginning, follow these remaining steps to migrate the framework projects shown below to 2.x:

plain JS project
Billboard.js project
JQuery project
Metal.js project
React project
Vue.js project

While Babel is required to transpile your source files, you must remove any Babel preset used for transformations from your project that bundler 1.x imposed. liferay-npm-bundler 2.x handles these transformations by default:

Remove the liferay-project preset from your project’s .babelrc file. All that should remain is the es2015 preset shown below:
```
{
  "presets": ["es2015"]
}
```
If your project uses React, make sure the react preset remains as well:
```
{
  "presets": ["es2015", "react"]
}
```
Remove the babel-preset-liferay-project dependency from your package.json.

If you’re migrating an Angular project, follow the steps in the next section.

Migrating an Angular Project

After following the steps covered in the beginning, follow these remaining steps to migrate your Angular project to 2.x. While liferay-npm-bundler 1.x relied on Babel to perform some transformation steps, these transformations are now automatically applied in version 2.x. Therefore, you should remove Babel from your project:

Open your tsconfig.json file and replace the "module": "amd" compiler option with the configuration shown below to produce CommonJS modules:
```
{
  "compilerOptions": {
    ...
    "module": "commonjs",
    ...
  }
}
```
Delete the .babelrc file to remove the Babel configuration.
Remove Babel from your package.json build process so it matches the configuration below:
```
{
  "scripts": {
    "build": "tsc && liferay-npm-bundler"
  },
  ...
}
```
Remove the following Babel dependencies from your package.json devDependencies:
```
"babel-cli": "6.26.0",
"babel-preset-liferay-amd": "1.2.2"
```