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feat: add size-report CI workflow
Nate Moore
(Jun 2, 2026, 8:58 PM -0500)
30fa63fd
4b5a8520
+118
+118
.github/workflows/size-report.yml
+118
.github/workflows/size-report.yml
···
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name: Size Report
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on:
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pull_request:
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permissions:
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contents: read
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pull-requests: write
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concurrency:
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group: ${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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jobs:
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size-report:
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name: Size Report
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runs-on: ubuntu-latest
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steps:
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- name: checkout
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uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v4
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with:
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submodules: true
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fetch-depth: 0
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persist-credentials: false
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- name: setup deno
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uses: denoland/setup-deno@667a34cdef165d8d2b2e98dde39547c9daac7282 # v2.0.4
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with:
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deno-version: v2.x
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- name: setup node
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uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v4
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with:
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node-version: 24
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- name: build (head)
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run: make && deno task build:npm 0.0.0
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- name: measure sizes (head)
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run: |
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cp tasks/measure-size.ts /tmp/measure-size.ts
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deno run --allow-read /tmp/measure-size.ts > /tmp/head-sizes.json
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- name: find merge base
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id: base
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run: |
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SHA=$(git merge-base HEAD origin/${{ github.base_ref }})
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echo "sha=$SHA" >> $GITHUB_OUTPUT
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- name: checkout base commit
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run: |
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git checkout ${{ steps.base.outputs.sha }}
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git submodule update --init --recursive
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- name: build (base)
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run: make && deno task build:npm 0.0.0
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- name: measure sizes (base)
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run: deno run --allow-read /tmp/measure-size.ts > /tmp/base-sizes.json
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- name: post size report
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uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
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with:
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script: |
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const fs = require('fs');
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const head = JSON.parse(fs.readFileSync('/tmp/head-sizes.json', 'utf8'));
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const base = JSON.parse(fs.readFileSync('/tmp/base-sizes.json', 'utf8'));
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const total = (arr) => arr.reduce(
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(acc, f) => ({ raw: acc.raw + f.raw, gzip: acc.gzip + f.gzip }),
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{ raw: 0, gzip: 0 }
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);
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const headTotal = total(head);
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const baseTotal = total(base);
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const deltaRaw = headTotal.raw - baseTotal.raw;
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const deltaGzip = headTotal.gzip - baseTotal.gzip;
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const fmt = (n) => `${(n / 1024).toFixed(1)} KB`;
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const fmtDelta = (n) =>
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n === 0 ? '±0 KB' : `${n > 0 ? '+' : ''}${(n / 1024).toFixed(1)} KB`;
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const takeaway =
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deltaGzip < 0 ? 'Size Reduced' :
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deltaGzip > 0 ? 'Size Increased' :
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'No Change to Size';
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const body = [
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'<!-- size-report -->',
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`**${takeaway}** — ${fmtDelta(deltaGzip)} gz, ${fmtDelta(deltaRaw)} raw`,
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'',
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`${fmt(headTotal.gzip)} gz (${fmt(headTotal.raw)} raw)`,
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].join('\n');
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const { data: comments } = await github.rest.issues.listComments({
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owner: context.repo.owner,
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repo: context.repo.repo,
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issue_number: context.issue.number,
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});
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const existing = comments.find(c => c.body.startsWith('<!-- size-report -->'));
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if (existing) {
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await github.rest.issues.updateComment({
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owner: context.repo.owner,
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repo: context.repo.repo,
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comment_id: existing.id,
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body,
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});
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} else {
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await github.rest.issues.createComment({
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owner: context.repo.owner,
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repo: context.repo.repo,
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issue_number: context.issue.number,
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body,
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});
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}