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Understanding Bundler Configuration Presets

The liferay-npm-bundler comes with a default configuration preset: liferay-npm-bundler-preset-standard. You may omit the liferay-npm-bundler prefix from the npm package name in your .npmbundlerrc file. This preset configures several plugins for the build process and is automatically used (even if the .npmbundlerrc is missing), unless you override it with one of your own. Running the liferay-npm-bundler with this preset applies the config file from liferay-npm-bundler-preset-standard:

{
  "/": {
    "plugins": ["resolve-linked-dependencies"],
    ".babelrc": {
      "presets": ["liferay-standard"]
    },
    "post-plugins": ["namespace-packages", "inject-imports-dependencies"]
  },
  "*": {
    "copy-plugins": ["exclude-imports"],
    "plugins": ["replace-browser-modules"],
    ".babelrc": {
      "presets": ["liferay-standard"]
    },
    "post-plugins": [
      "namespace-packages",
      "inject-imports-dependencies",
      "inject-peer-dependencies"
    ]
  }
}

The configuration above states that for all npm packages (*) the pre-process phase (plugins) must run the replace-browser-modules plugin. Setting this to post-plugins runs it during the post phase instead.

note

You can override configuration preset values by adding your own configuration to your project’s .npmbundlerrc file. For instance, using the configuration preset example above, you can define your own .babelrc value in .npmbundlerrc file to override the defined “liferay-standard” babelrc preset.

Liferay Standard Preset

The liferay-standard preset applies the following plugins to packages:

exclude-imports: Exclude packages declared in the imports section from the build.
inject-imports-dependencies: Inject dependencies declared in the imports section in the dependencies’ package.json files.
inject-peer-dependencies: Inject declared peer dependencies (as they are resolved in the project’s node_modules folder) in the dependencies’ package.json files.
namespace-packages: Namespace package names based on the root project’s package name to isolate packages per project and avoid collisions. This prepends <project-package-name>$ to each package name appearance in package.json files.
replace-browser-modules: Replaces the server side files for modules listed under browser/unpkg/jsdelivr section of package.json with their browser counterparts.
resolve-linked-dependencies: Replace linked dependencies versions appearing in package.json files (those obtained from local file system or GitHub, for example) by their real version numbers, as resolved in the project’s node_modules directory.

Liferay Babel Preset

The bundler also runs Babel with the babel-preset-liferay-standard preset, which invokes the following plugins:

babel-plugin-normalize-requires: Normalize AMD require() calls.
babel-plugin-transform-node-env-inline: Inline the NODE_ENV environment variable, and if it’s part of a binary expression (eg. process.env.NODE_ENV === "development"), then statically evaluate and replace it.
babel-plugin-minify-dead-code-elimination: Inline bindings when possible. Tries to evaluate expressions and prunes unreachable as a result.
babel-plugin-wrap-modules-amd: Wrap modules inside an AMD define() module.
babel-plugin-name-amd-modules: Name AMD modules based on package name, version, and module path.
babel-plugin-namespace-modules: Namespace modules based on the root project’s package name, prepending <project-package-name>$. Wrap modules inside an AMD define() module for each module name appearance (in define() or require() calls) so that the packages are localized per project and don’t clash.
babel-plugin-namespace-amd-define: Add a prefix to AMD define() calls (by default Liferay.Loader.).