rollup-plugin-block

Ensure certain files don't become part of the build.

Why?

Sometimes you want to have separate builds for dev and production. You might use the replace plugin to conditionally import certain files. This plugin lets you make sure that a file that is meant for one build isn't accidentally compiled into another.

Example

In this example if the __DEV_MODE__ check was missing, the non-dev build would fail because it would contain "debug-logger.devonly.js". With the __DEV_MODE__ check "debug-logger.devonly.js" would be omitted from the build by rollup given it's unused.

main.js

import { debugLogger } from './debug-logger.devonly.js';

if (__DEV_MODE__) {
  debugLogger.log('In dev mode.');
}

debug-logger.devonly.js

export const debugLogger = {
  log: msg => console.log(msg)
};

rollup.config.js

import rollupPluginBlock from 'rollup-plugin-block';
import replace from 'rollup-plugin-replace';

export default {
  input: 'main.js',
  plugins: [
    replace({
      __DEV_MODE__: JSON.stringify(!!process.env.DEV_BUILD)
    }),
    rollupPluginBlock({
      blockPattern: '.devonly.'
    })
  ]
};

Installation

npm install --save-dev rollup-plugin-block

Usage

import { rollup } from 'rollup';
import rollupPluginBlock from 'rollup-plugin-block';

export default {
  input: 'main.js',
  plugins: [
    rollupPluginBlock({
      blockPattern: '.devonly.' // or regex
    })
  ]
});