rollup.config.js

import commonjs from '@rollup/plugin-commonjs'
import resolve from '@rollup/plugin-node-resolve'
import { terser } from 'rollup-plugin-terser'

const plugins = [
  resolve({
    extensions: ['.mjs', '.js', '.ts'],
    mainFields: ['module', 'jsnext', 'main'],
    preferBuiltins: false,
    browser: true,
  }),
  commonjs({
    ignoreGlobal: true,
    include: /\/node_modules\//,
    extensions: ['.mjs', '.js', '.ts'],
  }),
  terser({
    warnings: true,
    ecma: 2015,
    keep_fnames: true,
    ie8: false,
    compress: {
      pure_getters: true,
      toplevel: true,
      booleans_as_integers: false,
      keep_fnames: true,
      keep_fargs: true,
      if_return: false,
      ie8: false,
      sequences: false,
      loops: false,
      conditionals: false,
      join_vars: false,
    },
    mangle: {
      module: true,
      keep_fnames: true,
    },
    output: {
      beautify: true,
      braces: true,
      indent_level: 2,
    },
  }),
]

const output = format => {
  const extension = format === 'esm' ? '.mjs' : '.js'
  return {
    chunkFileNames: '[name]-[hash]' + extension,
    entryFileNames: '[name]' + extension,
    dir: './dist',
    exports: 'named',
    sourcemap: false,
    indent: false,
    freeze: false,
    strict: false,
    format,
    esModule: format !== 'esm',
    externalLiveBindings: format !== 'esm',
    generatedCode: {
      preset: 'es5',
      reservedNamesAsProps: false,
      objectShorthand: false,
      constBindings: false,
    },
  }
}

const config = {
  input: {
    index: './src/index.js',
    pipe: './src/pipe.js',
    flow: './src/flow.js',
    Array: './src/Array/index.js',
    AsyncData: './src/AsyncData/index.js',
    AsyncDataResult: './src/AsyncDataResult/index.js',
    AsyncOption: './src/AsyncOption/index.js',
    AsyncResult: './src/AsyncResult/index.js',
    Bool: './src/Bool/index.js',
    Dict: './src/Dict/index.js',
    Function: './src/Function/index.js',
    Guards: './src/Guards/index.js',
    Number: './src/Number/index.js',
    Option: './src/Option/index.js',
    Result: './src/Result/index.js',
    String: './src/String/index.js',
  },
  onwarn: () => {},
  external: () => false,
  plugins,
  treeshake: {
    unknownGlobalSideEffects: false,
    tryCatchDeoptimization: false,
    moduleSideEffects: false,
  },
  output: [output('esm'), output('cjs')],
}

export default config