Read size workflow (mrdoob/three.js)

The Read size workflow from mrdoob/three.js, explained and optimized by Latchkey.

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Source: mrdoob/three.js.github/workflows/read-size.ymlLicense MITView source

What it does

This is the Read size workflow from the mrdoob/three.js repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: Read size

on:
  pull_request:
    paths:
      - 'src/**'
      - 'package.json'
      - 'utils/build/**'

# This workflow runs in a read-only environment. We can safely checkout
# the PR code here.
# Reference:
# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
permissions:
  contents: read

jobs:
  read-size:
    name: Tree-shaking
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Git checkout
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
      - name: Install Node
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
        with:
          node-version: 24
          cache: 'npm'
      - name: Install dependencies
        run: npm ci
      - name: Build
        run: npm run build
      - name: === Test tree-shaking ===
        run: npm run test-treeshake
      - name: Read bundle sizes
        id: read-size
        run: |
          # minify the builds to measure their size
          npx terser build/three.module.js --module --compress --mangle --output build/three.module.min.js
          npx terser build/three.webgpu.js --module --compress --mangle --output build/three.webgpu.min.js
          npx terser build/three.webgpu.nodes.js --module --compress --mangle --output build/three.webgpu.nodes.min.js

          WEBGL_FILESIZE=$(stat --format=%s build/three.module.min.js)
          gzip -k build/three.module.min.js
          WEBGL_FILESIZE_GZIP=$(stat --format=%s build/three.module.min.js.gz)
          WEBGL_TREESHAKEN=$(stat --format=%s test/treeshake/index.bundle.min.js)
          gzip -k test/treeshake/index.bundle.min.js
          WEBGL_TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.bundle.min.js.gz)

          WEBGPU_FILESIZE=$(stat --format=%s build/three.webgpu.min.js)
          gzip -k build/three.webgpu.min.js
          WEBGPU_FILESIZE_GZIP=$(stat --format=%s build/three.webgpu.min.js.gz)
          WEBGPU_TREESHAKEN=$(stat --format=%s test/treeshake/index.webgpu.bundle.min.js)
          gzip -k test/treeshake/index.webgpu.bundle.min.js
          WEBGPU_TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.webgpu.bundle.min.js.gz)

          WEBGPU_NODES_FILESIZE=$(stat --format=%s build/three.webgpu.nodes.min.js)
          gzip -k build/three.webgpu.nodes.min.js
          WEBGPU_NODES_FILESIZE_GZIP=$(stat --format=%s build/three.webgpu.nodes.min.js.gz)
          WEBGPU_NODES_TREESHAKEN=$(stat --format=%s test/treeshake/index.webgpu.nodes.bundle.min.js)
          gzip -k test/treeshake/index.webgpu.nodes.bundle.min.js
          WEBGPU_NODES_TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.webgpu.nodes.bundle.min.js.gz)

          PR=${{ github.event.pull_request.number }}

          # write the output in a json file to upload it as artifact
          node -pe "JSON.stringify({ filesize: $WEBGL_FILESIZE, gzip: $WEBGL_FILESIZE_GZIP, treeshaken: $WEBGL_TREESHAKEN, treeshakenGzip: $WEBGL_TREESHAKEN_GZIP, filesize2: $WEBGPU_FILESIZE, gzip2: $WEBGPU_FILESIZE_GZIP, treeshaken2: $WEBGPU_TREESHAKEN, treeshakenGzip2: $WEBGPU_TREESHAKEN_GZIP, filesize3: $WEBGPU_NODES_FILESIZE, gzip3: $WEBGPU_NODES_FILESIZE_GZIP, treeshaken3: $WEBGPU_NODES_TREESHAKEN, treeshakenGzip3: $WEBGPU_NODES_TREESHAKEN_GZIP, pr: $PR })" > sizes.json
      - name: Upload artifact
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: sizes
          path: sizes.json

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: Read size
 
on:
  pull_request:
    paths:
      - 'src/**'
      - 'package.json'
      - 'utils/build/**'
 
# This workflow runs in a read-only environment. We can safely checkout
# the PR code here.
# Reference:
# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  read-size:
    timeout-minutes: 30
    name: Tree-shaking
    runs-on: latchkey-small
    permissions:
      contents: read
    steps:
      - name: Git checkout
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
      - name: Install Node
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
        with:
          node-version: 24
          cache: 'npm'
      - name: Install dependencies
        run: npm ci
      - name: Build
        run: npm run build
      - name: === Test tree-shaking ===
        run: npm run test-treeshake
      - name: Read bundle sizes
        id: read-size
        run: |
          # minify the builds to measure their size
          npx terser build/three.module.js --module --compress --mangle --output build/three.module.min.js
          npx terser build/three.webgpu.js --module --compress --mangle --output build/three.webgpu.min.js
          npx terser build/three.webgpu.nodes.js --module --compress --mangle --output build/three.webgpu.nodes.min.js
 
          WEBGL_FILESIZE=$(stat --format=%s build/three.module.min.js)
          gzip -k build/three.module.min.js
          WEBGL_FILESIZE_GZIP=$(stat --format=%s build/three.module.min.js.gz)
          WEBGL_TREESHAKEN=$(stat --format=%s test/treeshake/index.bundle.min.js)
          gzip -k test/treeshake/index.bundle.min.js
          WEBGL_TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.bundle.min.js.gz)
 
          WEBGPU_FILESIZE=$(stat --format=%s build/three.webgpu.min.js)
          gzip -k build/three.webgpu.min.js
          WEBGPU_FILESIZE_GZIP=$(stat --format=%s build/three.webgpu.min.js.gz)
          WEBGPU_TREESHAKEN=$(stat --format=%s test/treeshake/index.webgpu.bundle.min.js)
          gzip -k test/treeshake/index.webgpu.bundle.min.js
          WEBGPU_TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.webgpu.bundle.min.js.gz)
 
          WEBGPU_NODES_FILESIZE=$(stat --format=%s build/three.webgpu.nodes.min.js)
          gzip -k build/three.webgpu.nodes.min.js
          WEBGPU_NODES_FILESIZE_GZIP=$(stat --format=%s build/three.webgpu.nodes.min.js.gz)
          WEBGPU_NODES_TREESHAKEN=$(stat --format=%s test/treeshake/index.webgpu.nodes.bundle.min.js)
          gzip -k test/treeshake/index.webgpu.nodes.bundle.min.js
          WEBGPU_NODES_TREESHAKEN_GZIP=$(stat --format=%s test/treeshake/index.webgpu.nodes.bundle.min.js.gz)
 
          PR=${{ github.event.pull_request.number }}
 
          # write the output in a json file to upload it as artifact
          node -pe "JSON.stringify({ filesize: $WEBGL_FILESIZE, gzip: $WEBGL_FILESIZE_GZIP, treeshaken: $WEBGL_TREESHAKEN, treeshakenGzip: $WEBGL_TREESHAKEN_GZIP, filesize2: $WEBGPU_FILESIZE, gzip2: $WEBGPU_FILESIZE_GZIP, treeshaken2: $WEBGPU_TREESHAKEN, treeshakenGzip2: $WEBGPU_TREESHAKEN_GZIP, filesize3: $WEBGPU_NODES_FILESIZE, gzip3: $WEBGPU_NODES_FILESIZE_GZIP, treeshaken3: $WEBGPU_NODES_TREESHAKEN, treeshakenGzip3: $WEBGPU_NODES_TREESHAKEN_GZIP, pr: $PR })" > sizes.json
      - name: Upload artifact
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: sizes
          path: sizes.json

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.
Add a job timeout so a hung step cannot burn hours of runner time.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout actions/setup-node actions/upload-artifact