javascript - How to disable Tree shaking in rollupjs -

i trying bundle several javascript files using rollup.js when do, classes aren't used removed. process called tree shaking , want disable it.

i have found this doesn't seem have effect.

// rollup.config.js  let configuration = {   output: {     format: 'es',   },   name: 'namename',   input: './main.js',   treeshake: false, // <-- disabling tree shaking? };  export default configuration; 

i added treeshake: false configuration, doesn't seem have effect. supposed placed somewhere else?

here files trying roll up.

// base.js export default class base {   amethod() {     return "hello";   } }  // main.js  import base './base.js'; 

so set up, call rollup --config , produces empty. clearly, tree shaking happening , removing base class though imported it.

so far workaround i've found create instance of class, undesirable.

// main.js import base './base.js';  export default function () {     {            new base();     } } 

my goal use bundled javascript file jscontext. take in javascript string , there, i'd invoke methods needed.

// suppose rollup.js produces file called "product.js"  let s = string(contentsoffile: "path/to/product.js") let context = jscontext()! context.evaluatescript(s)  context.evaluatescript("var b = new base()") context.evaluatescript("b.amethod()") 

but because of tree shaking base class never gets placed in product.js

is there way disable tree shaking?

i've included sample project this.

your entry file — main.js — needs export classes or other values need accessible outside world:

// main.js import base './base.js'; import subb './subb.js'; import suba './suba.js';  export { base, suba, subb };