rollup.config.ts

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import sourceMaps from 'rollup-plugin-sourcemaps';
import typescript from 'rollup-plugin-typescript2';
import json from 'rollup-plugin-json';

const pkg = require('./package.json');

const libraryName = 'index';

export default {
    input: `src/${libraryName}.ts`,
    output: [
        {
            file: pkg.main,
            name: 'myBlogServer',
            format: 'umd',
            sourcemap: true
        },
        {
            file: pkg.module,
            format: 'es',
            sourcemap: true
        }
    ],
    // Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
    external: [],
    watch: {
        include: 'src/**'
    },
    plugins: [
        // Allow json resolution
        json(),
        // Compile TypeScript files
        typescript({useTsconfigDeclarationDir: true}),
        // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
        commonjs(),
        // Allow node_modules resolution, so you can use 'external' to control
        // which external modules to include in the bundle
        // https://github.com/rollup/rollup-plugin-node-resolve#usage
        resolve(),

        // Resolve source maps to the original source
        sourceMaps()
    ]
};