rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import { terser } from 'rollup-plugin-terser';
import pkg from './package.json';

// Config based on https://github.com/rollup/rollup-starter-lib

export default [{
    // browser-friendly UMD build
    input: 'src/vuex-helpers.js',
    output: [{
        name: 'vuexHelpers',
        file: pkg.browser,
        format: 'umd',
    }, {
        name: 'vuexHelpers',
        file: pkg.browser.replace(/\.js$/, '.min.js'),
        format: 'umd',
    }],
    plugins: [
        resolve(), // so Rollup can find `ms`
        commonjs(), // so Rollup can convert `ms` to an ES module
        terser({
            include: [/^.+\.min\.js$/],
        }),
    ],
}, {
    // CommonJS (for Node) and ES module (for bundlers) build.
    // (We could have three entries in the configuration array
    // instead of two, but it's quicker to generate multiple
    // builds from a single configuration where possible, using
    // an array for the `output` option, where we can specify
    // `file` and `format` for each target)
    input: 'src/vuex-helpers.js',
    output: [{
        file: pkg.main,
        format: 'cjs',
    }],
}];