Tree shaking, removal of unused/dead code

[cayolblake]

@nickreese for the life of me I'm not able to find a way to use Terser/Uglify to do treeshaking, or remove any JavaScript code that is not used, sometimes called dead code, for builds.

In terser (which supports ES6) for example, compress: {defaults: false, dead_code: true, unused: true} which ends up removing both unused and dead code, in addition to https://rollupjs.org/guide/en/#tree-shaking

Where/How to do it? 🤷

[eight04]

Elderjs does include terser in its default config:

elderjs/src/rollup/getRollupConfig.ts

Line 3 in 162972c

import { terser } from 'rollup-plugin-terser';

It is only used on production builds:

elderjs/src/rollup/getRollupConfig.ts

Line 15 in 162972c

const production = process.env.NODE_ENV === 'production' || !process.env.ROLLUP_WATCH;

elderjs/src/rollup/getRollupConfig.ts

Lines 65 to 77 in 162972c

	if (production) {
	config.plugins.push(
	babel({
	extensions: ['.js', '.mjs', '.cjs', '.html', '.svelte'],
	include: ['node_modules/**', 'src/**'],
	exclude: ['node_modules/@babel/**'],
	runtimeHelpers: true,
	}),
	);
	// terser on prod
	config.plugins.push(terser());
	}