rollup.config.js

import resolve from "rollup-plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";
import sourceMaps from "rollup-plugin-sourcemaps";
// import camelCase from 'lodash.camelcase'
import typescript from "rollup-plugin-typescript2";
import json from "rollup-plugin-json";

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

export default {
    input: "src/index.ts",
    output: [
        // { file: pkg.main, name: "ctool", 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({ tsconfig: "./tsconfig.json", 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()
    ]
};