directus/packages/format-title/rollup.config.ts

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');

const libraryName = 'format-title';

export default {
	input: `src/${libraryName}.ts`,
	output: [
		{
			file: pkg.main,
			name: camelCase(libraryName),
			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(),
	],
};