Another Tree Shaking THREE.JS Thread

Questions
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1

I’ve been trying to Tree Shake my vite project. Currently using this for my configuration file

 rollupOptions: {
      treeshake: {
      
        preset: "smallest",
      
        moduleSideEffects: false,
   
        propertyReadSideEffects: false,
        unknownGlobalSideEffects: false,
      },
      output: {
        manualChunks(id) {
          if (id.includes("node_modules")) {
            if (id.includes("gsap")) return "gsap"; 
            if (id.includes("three/examples/jsm/controls/OrbitControls"))
              return "orbit-controls";
            if (id.includes("three/examples/jsm/loaders/")) return "loaders"; 
            if (id.includes("three/addons/loaders/GLTFLoader"))
              return "gltf-loader";
            if (id.includes("three/src/") || id.includes("three/build/"))
              return "three-core";

            return "vendor";
          }
        },
      },
    },

And still getting about 52% of completely unused code under Coverage Section on DevTools
All of my imports look like this

import { MathUtils } from "three/src/math/MathUtils.js";

import { AmbientLight } from "three/src/lights/AmbientLight.js";
import { PointLight } from "three/src/lights/PointLight.js";
import { RectAreaLight } from "three/src/lights/RectAreaLight.js";

import { Group } from "three/src/objects/Group.js";
import { Mesh } from "three/src/objects/Mesh.js";
import { PlaneGeometry } from "three/src/geometries/PlaneGeometry.js";

What is the state of tree shaking in THREE.JS and are there any tips for more efficient tree shaking?

2

It’s more of a bundler configuration issue, you can try a more aggressive config with "sideEffects": false in your package.json. Or use one of the vite plugins, vite-plugin-unused-code or vite-plugin-deadfile.

It might also helps to visualize and analyze your final bundle with rollup-plugin-visualizer.

Use at your own risk, this may have unintended side effects.

2 Likes
3

Im already using sideEffects false in my vite config.
Thank you. Will try it out! :smiley:
UPD: Didn’t work at all