Tree shaking, removal of unused/dead code

[Cayol Blake]

@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? 🤷

[eight]

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()); 
 }