rollup.config.js

const terser = require('rollup-plugin-terser').terser;
const nodeResolve = require('@rollup/plugin-node-resolve').default;
const replace = require('@rollup/plugin-replace');
const packageJson = require('./package.json');

function getDevBuildMetadata() {
	const now = new Date();
	return now.toISOString().replace(/:\d+\..+/g, '').replace(/[-T:]/g, '');
}

function getCurrentVersion() {
	const isDev = process.env.BUILD_TAG !== 'release';
	return `${packageJson.version}` + (isDev ? `-dev+${getDevBuildMetadata()}` : '');
}

const currentVersion = getCurrentVersion();

const year = new Date().getFullYear();

function getConfig(
	inputFile,
	{ format, isProd, isStandalone }
) {
	const mode = isProd ? 'production' : 'development';
	const extension = {
		cjs: 'cjs',
		esm: 'mjs',
		iife: 'js',
	}[format];
	const config = {
		input: inputFile,
		output: {
			format,
			file: `./dist/lightweight-charts${isStandalone ? '.standalone' : ''}.${mode}.${extension}`,
			banner: `
/*!
 * @license
 * TradingView Lightweight Charts™ v${currentVersion}
 * Copyright (c) ${year} TradingView, Inc.
 * Licensed under Apache License 2.0 https://www.apache.org/licenses/LICENSE-2.0
 */`.trim(),
		},
		plugins: [
			nodeResolve(),
			replace({
				preventAssignment: true,
				values: {
					// make sure that this values are synced with src/typings/globals/index.d.ts
					'process.env.NODE_ENV': JSON.stringify(
						isProd ? 'production' : 'development'
					),
					'process.env.BUILD_VERSION': JSON.stringify(currentVersion),
				},
			}),
			isProd &&
				terser({
					output: {
						comments: /@license/,
						// eslint-disable-next-line camelcase
						inline_script: true,
					},
					mangle: {
						module: format === 'esm' || format === 'cjs',
						properties: {
							regex: /^_(private|internal)_/,
						},
					},
				}),
		],
		external: id => !isStandalone && /^fancy-canvas(\/.+)?$/.test(id),
	};

	return config;
}

const modes = [false];
if (process.env.NODE_ENV === 'production') {
	modes.push(true);
}

const configs = [];
modes.forEach(mode => {
	configs.push(
		getConfig('./lib/prod/src/index.js', { format: 'esm', isProd: mode }),
		getConfig('./lib/prod/src/index.js', {
			format: 'esm',
			isProd: mode,
			isStandalone: true,
		}),
		getConfig('./lib/prod/src/index.js', { format: 'cjs', isProd: mode }),
		getConfig('./lib/prod/src/standalone.js', {
			format: 'iife',
			isProd: mode,
			isStandalone: true,
		})
	);
});

// eslint-disable-next-line no-console
console.log(`Building version: ${currentVersion}`);

module.exports = configs;