three.js/.github/workflows/report-size.yml

name: Report size

on:
  workflow_run:
    workflows: ["Read size"]
    types:
      - completed

# This workflow needs to be run with "pull-requests: write" permissions to
# be able to comment on the pull request. We can't checkout the PR code
# in this workflow.
# Reference:
# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
permissions:
  pull-requests: write

jobs:
  report-size:
    name: Comment on PR
    runs-on: ubuntu-latest
    if: github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success'
    steps:
      - name: Log GitHub context
        env:
          GITHUB_CONTEXT: ${{ toJson(github) }}
        run: echo "$GITHUB_CONTEXT"

      # Using actions/download-artifact doesn't work here
      # https://github.com/actions/download-artifact/issues/60
      - name: Download artifact
        uses: actions/github-script@v6
        id: download-artifact
        with:
          result-encoding: string
          script: |
            const fs = require('fs/promises');

            const artifacts = await github.rest.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: context.payload.workflow_run.id,
            });
            const matchArtifact = artifacts.data.artifacts.find((artifact) => artifact.name === 'sizes');
            const download = await github.rest.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });

            await fs.writeFile('sizes.zip', Buffer.from(download.data));
            await exec.exec('unzip sizes.zip');
            const json = await fs.readFile('sizes.json', 'utf8');
            return json;

      # This runs on the base branch of the PR, meaning "dev"
      - name: Git checkout
        uses: actions/checkout@v3
      - name: Install Node
        uses: actions/setup-node@v3
        with:
          node-version: 18
          cache: 'npm'
      - name: Install dependencies
        run: npm ci
      - name: Build
        run: npm run build-module
      - name: === Test tree-shaking ===
        run: npm run test-treeshake
      - name: Read sizes
        id: read-size
        run: |
          FILESIZE_BASE=$(stat --format=%s test/treeshake/three.module.min.js)
          TREESHAKEN_BASE=$(stat --format=%s test/treeshake/index.bundle.min.js)

          # log to console
          echo "FILESIZE_BASE=$FILESIZE_BASE"
          echo "TREESHAKEN_BASE=$TREESHAKEN_BASE"

          echo "FILESIZE_BASE=$FILESIZE_BASE" >> $GITHUB_OUTPUT
          echo "TREESHAKEN_BASE=$TREESHAKEN_BASE" >> $GITHUB_OUTPUT

      - name: Format sizes
        id: format
        # It's important these are passed as env variables.
        # https://securitylab.github.com/research/github-actions-untrusted-input/
        env:
          FILESIZE: ${{ fromJSON(steps.download-artifact.outputs.result).filesize }}
          FILESIZE_GZIP: ${{ fromJSON(steps.download-artifact.outputs.result).gzip }}
          FILESIZE_BASE: ${{ steps.read-size.outputs.FILESIZE_BASE }}
          TREESHAKEN: ${{ fromJSON(steps.download-artifact.outputs.result).treeshaken }}
          TREESHAKEN_GZIP: ${{ fromJSON(steps.download-artifact.outputs.result).treeshakenGzip }}
          TREESHAKEN_BASE: ${{ steps.read-size.outputs.TREESHAKEN_BASE }}
        run: |
          FILESIZE_FORM=$(node ./test/treeshake/utils/format-size.js "$FILESIZE")
          FILESIZE_GZIP_FORM=$(node ./test/treeshake/utils/format-size.js "$FILESIZE_GZIP")
          FILESIZE_DIFF=$(node ./test/treeshake/utils/format-diff.js "$FILESIZE" "$FILESIZE_BASE")
          TREESHAKEN_FORM=$(node ./test/treeshake/utils/format-size.js "$TREESHAKEN")
          TREESHAKEN_GZIP_FORM=$(node ./test/treeshake/utils/format-size.js "$TREESHAKEN_GZIP")
          TREESHAKEN_DIFF=$(node ./test/treeshake/utils/format-diff.js "$TREESHAKEN" "$TREESHAKEN_BASE")

          echo "FILESIZE=$FILESIZE_FORM" >> $GITHUB_OUTPUT
          echo "FILESIZE_GZIP=$FILESIZE_GZIP_FORM" >> $GITHUB_OUTPUT
          echo "FILESIZE_DIFF=$FILESIZE_DIFF" >> $GITHUB_OUTPUT
          echo "TREESHAKEN=$TREESHAKEN_FORM" >> $GITHUB_OUTPUT
          echo "TREESHAKEN_GZIP=$TREESHAKEN_GZIP_FORM" >> $GITHUB_OUTPUT
          echo "TREESHAKEN_DIFF=$TREESHAKEN_DIFF" >> $GITHUB_OUTPUT

      - name: Find existing comment
        uses: peter-evans/find-comment@v2
        id: find-comment
        with:
          issue-number: ${{ fromJSON(steps.download-artifact.outputs.result).pr }}
          comment-author: 'github-actions[bot]'
          body-includes: Bundle size
      - name: Comment on PR
        uses: peter-evans/create-or-update-comment@v2
        with:
          issue-number: ${{ fromJSON(steps.download-artifact.outputs.result).pr }}
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          edit-mode: replace
          body: |
            ### 📦 Bundle size

            _Full ESM build, minified and gzipped._

            | Filesize | Gzipped | Diff from `${{ github.ref_name }}` |
            |----------|---------|------|
            | ${{ steps.format.outputs.FILESIZE }} | ${{ steps.format.outputs.FILESIZE_GZIP }} | ${{ steps.format.outputs.FILESIZE_DIFF }} |

            ### 🌳 Bundle size after tree-shaking

            _Minimal build including a renderer, camera, empty scene, and dependencies._

            | Filesize | Gzipped | Diff from `${{ github.ref_name }}` |
            |----------|---------|------|
            | ${{ steps.format.outputs.TREESHAKEN }} | ${{ steps.format.outputs.TREESHAKEN_GZIP }} | ${{ steps.format.outputs.TREESHAKEN_DIFF }} |