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storybook-chromatic.yml
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name: Storybook
on:
pull_request:
paths: # Only run if the frontend has changed
- 'frontend/**'
- '.storybook/**'
- 'package.json'
- '.github/workflows/storybook-chromatic.yml'
concurrency:
group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
# This is so that the workflow run isn't canceled when a snapshot update is pushed within it by posthog-bot
# We do however cancel from container-images-ci.yml if a commit is pushed by someone OTHER than posthog-bot
cancel-in-progress: false
jobs:
storybook-chromatic:
name: Publish to Chromatic
runs-on: ubuntu-latest
timeout-minutes: 15
if: github.event.pull_request.head.repo.full_name == github.repository # Don't run on forks
outputs:
storybook-url: ${{ steps.publish.outputs.storybookUrl }}
steps:
- uses: actions/checkout@v3
with:
fetch-depth: 0 # 👈 Required to retrieve git history (https://www.chromatic.com/docs/github-actions)
- name: Install pnpm
uses: pnpm/action-setup@v4
- name: Set up Node.js
uses: actions/setup-node@v4
with:
node-version: 18.12.1
cache: pnpm
- name: Install dependencies and Chromatic
run: pnpm i -D chromatic
- name: Publish to Chromatic
uses: chromaui/action@v11
id: publish
with:
token: ${{ secrets.GITHUB_TOKEN }}
# 👇 Chromatic projectToken, refer to the manage page to obtain it.
projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}
visual-regression:
name: Visual regression tests
runs-on: ubuntu-latest
timeout-minutes: 30
container:
image: mcr.microsoft.com/playwright:v1.41.2
strategy:
fail-fast: false
matrix:
browser: ['chromium', 'webkit']
shard: [1, 2]
env:
SHARD_COUNT: '2'
CYPRESS_INSTALL_BINARY: '0'
NODE_OPTIONS: --max-old-space-size=6144
OPT_OUT_CAPTURE: 1
outputs:
# The below have to be manually listed unfortunately, as GitHub Actions doesn't allow matrix-dependent outputs
chromium-1-added: ${{ steps.diff.outputs.chromium-1-added }}
chromium-1-modified: ${{ steps.diff.outputs.chromium-1-modified }}
chromium-1-deleted: ${{ steps.diff.outputs.chromium-1-deleted }}
chromium-1-total: ${{ steps.diff.outputs.chromium-1-total }}
chromium-1-commitHash: ${{ steps.commit-hash.outputs.chromium-1-commitHash }}
chromium-2-added: ${{ steps.diff.outputs.chromium-2-added }}
chromium-2-modified: ${{ steps.diff.outputs.chromium-2-modified }}
chromium-2-deleted: ${{ steps.diff.outputs.chromium-2-deleted }}
chromium-2-total: ${{ steps.diff.outputs.chromium-2-total }}
chromium-2-commitHash: ${{ steps.commit-hash.outputs.chromium-2-commitHash }}
webkit-1-added: ${{ steps.diff.outputs.webkit-1-added }}
webkit-1-modified: ${{ steps.diff.outputs.webkit-1-modified }}
webkit-1-deleted: ${{ steps.diff.outputs.webkit-1-deleted }}
webkit-1-total: ${{ steps.diff.outputs.webkit-1-total }}
webkit-1-commitHash: ${{ steps.commit-hash.outputs.webkit-1-commitHash }}
webkit-2-added: ${{ steps.diff.outputs.webkit-2-added }}
webkit-2-modified: ${{ steps.diff.outputs.webkit-2-modified }}
webkit-2-deleted: ${{ steps.diff.outputs.webkit-2-deleted }}
webkit-2-total: ${{ steps.diff.outputs.webkit-2-total }}
webkit-2-commitHash: ${{ steps.commit-hash.outputs.webkit-2-commitHash }}
firefox-1-added: ${{ steps.diff.outputs.firefox-1-added }}
firefox-1-modified: ${{ steps.diff.outputs.firefox-1-modified }}
firefox-1-deleted: ${{ steps.diff.outputs.firefox-1-deleted }}
firefox-1-total: ${{ steps.diff.outputs.firefox-1-total }}
firefox-1-commitHash: ${{ steps.commit-hash.outputs.firefox-1-commitHash }}
firefox-2-added: ${{ steps.diff.outputs.firefox-2-added }}
firefox-2-modified: ${{ steps.diff.outputs.firefox-2-modified }}
firefox-2-deleted: ${{ steps.diff.outputs.firefox-2-deleted }}
firefox-2-total: ${{ steps.diff.outputs.firefox-2-total }}
firefox-2-commitHash: ${{ steps.commit-hash.outputs.firefox-2-commitHash }}
steps:
- uses: actions/checkout@v3
with:
fetch-depth: 1
repository: ${{ github.event.pull_request.head.repo.full_name }}
ref: ${{ github.event.pull_request.head.ref }}
# Use PostHog Bot token when not on forks to enable proper snapshot updating
token: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN || github.token }}
- name: Install pnpm
uses: pnpm/action-setup@v4
- name: Set up Node.js
uses: buildjet/setup-node@v3
with:
node-version: 18.12.1
cache: pnpm
- name: Install package.json dependencies with pnpm
run: pnpm install --frozen-lockfile
- name: Install CI utilities with pnpm
run: pnpm install http-server wait-on
- name: Build Storybook
run: pnpm build-storybook --test --quiet # Silence since progress logging results in a massive wall of spam
- name: Serve Storybook in the background
run: |
retries=3
while [ $retries -gt 0 ]; do
pnpm exec http-server storybook-static --port 6006 --silent &
if pnpm wait-on http://127.0.0.1:6006 --timeout 15; then
break
fi
retries=$((retries-1))
echo "Failed to serve Storybook, retrying... ($retries retries left)"
done
- name: Run @storybook/test-runner
env:
# Solving this bug by overriding $HOME: https://github.com/microsoft/playwright/issues/6500
HOME: /root
# Update snapshots for PRs on the main repo, verify on forks, which don't have access to PostHog Bot
VARIANT: ${{ github.event.pull_request.head.repo.full_name == github.repository && 'update' || 'verify' }}
STORYBOOK_SKIP_TAGS: 'test-skip,test-skip-${{ matrix.browser }}'
run: |
pnpm test:visual:ci:$VARIANT --browsers ${{ matrix.browser }} --shard ${{ matrix.shard }}/$SHARD_COUNT
- name: Archive failure screenshots
if: ${{ failure() }}
uses: actions/upload-artifact@v3
with:
name: failure-screenshots-${{ matrix.browser }}
path: frontend/__snapshots__/__failures__/
- name: Count and optimize updated snapshots
id: diff
# Skip on forks
if: github.event.pull_request.head.repo.full_name == github.repository
run: |
git config --global --add safe.directory '*' # Calm git down about file ownership
git diff --name-status frontend/__snapshots__/ # For debugging
ADDED=$(git diff --name-status frontend/__snapshots__/ | grep '^A' | wc -l)
MODIFIED=$(git diff --name-status frontend/__snapshots__/ | grep '^M' | wc -l)
DELETED=$(git diff --name-status frontend/__snapshots__/ | grep '^D' | wc -l)
TOTAL=$(git diff --name-status frontend/__snapshots__/ | wc -l)
# If added or modified, run OptiPNG
if [ $ADDED -gt 0 ] || [ $MODIFIED -gt 0 ]; then
echo "Snapshots updated ($ADDED new, $MODIFIED changed), running OptiPNG"
apt update && apt install -y optipng
optipng -clobber -o4 -strip all
# we don't want to _always_ run OptiPNG
# so, we run it after checking for a diff
# but, the files we diffed might then be changed by OptiPNG
# and as a result they might no longer be different...
# we check again
git diff --name-status frontend/__snapshots__/ # For debugging
ADDED=$(git diff --name-status frontend/__snapshots__/ | grep '^A' | wc -l)
MODIFIED=$(git diff --name-status frontend/__snapshots__/ | grep '^M' | wc -l)
DELETED=$(git diff --name-status frontend/__snapshots__/ | grep '^D' | wc -l)
TOTAL=$(git diff --name-status frontend/__snapshots__/ | wc -l)
if [ $ADDED -gt 0 ] || [ $MODIFIED -gt 0 ]; then
echo "Snapshots updated ($ADDED new, $MODIFIED changed), _even after_ running OptiPNG"
git add frontend/__snapshots__/ playwright/
fi
fi
echo "${{ matrix.browser }}-${{ matrix.shard }}-added=$ADDED" >> $GITHUB_OUTPUT
echo "${{ matrix.browser }}-${{ matrix.shard }}-modified=$MODIFIED" >> $GITHUB_OUTPUT
echo "${{ matrix.browser }}-${{ matrix.shard }}-deleted=$DELETED" >> $GITHUB_OUTPUT
echo "${{ matrix.browser }}-${{ matrix.shard }}-total=$TOTAL" >> $GITHUB_OUTPUT
- name: Commit updated snapshots
uses: EndBug/add-and-commit@v9
if: github.event.pull_request.head.repo.full_name == github.repository
id: commit
with:
add: '["frontend/__snapshots__/", "playwright/"]'
message: 'Update UI snapshots for `${{ matrix.browser }}` (${{ matrix.shard }})'
pull: --rebase --autostash # Make sure we're up to date with other browsers' updates
default_author: github_actions
github_token: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN || github.token }}
- name: Add commit hash to outputs, including browser name
id: commit-hash
if: steps.commit.outputs.pushed == 'true'
run: echo "${{ matrix.browser }}-${{ matrix.shard }}-commitHash=${{ steps.commit.outputs.commit_long_sha }}" >> $GITHUB_OUTPUT
visual-regression-summary:
name: Summarize visual regression tests
runs-on: ubuntu-latest
timeout-minutes: 5
needs: visual-regression
if: always() # Run even if visual-regression fails for one (or more) of the browsers
steps:
- name: Post comment about updated snapshots
if: github.event.pull_request.head.repo.full_name == github.repository
uses: actions/github-script@v6
with:
github-token: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN || github.token }}
script: |
const BROWSERS = ['chromium', 'webkit']
const diffJobOutputs = ${{ toJson(needs.visual-regression.outputs) }}
const summaryDiff = { total: 0, added: 0, modified: 0, deleted: 0 }
const diffByBrowser = Object.fromEntries(BROWSERS.map(browser => [browser, {
total: 0, added: 0, modified: 0, deleted: 0, commitHashes: []
}]))
for (const [key, rawValue] of Object.entries(diffJobOutputs)) {
// Split e.g. 'chromium-1-commitHash' into ['chromium', '1' 'commitHash']
const [browser, shardNumber, diffKey] = key.split('-')
// Sum up the counts - but not the commit hash
if (diffKey === 'commitHash') {
diffByBrowser[browser].commitHashes.push([parseInt(shardNumber), rawValue])
} else {
const value = parseInt(rawValue)
diffByBrowser[browser][diffKey] += value
summaryDiff[diffKey] += value
}
}
for (const browser of BROWSERS) {
if (diffByBrowser[browser]?.total === undefined) {
diffByBrowser[browser] = null // Null means failure
}
}
if (summaryDiff.total === 0) {
console.log('No changes were made, skipping comment')
return
}
const diffByBrowserDisplay = Object.entries(diffByBrowser).map(([browser, diff]) => {
if (!diff) {
return `- \`${browser}\`: failed`
}
const { added: a, modified: m, deleted: d, commitHashes } = diff
const b = a + m + d > 0 ? '**' : '' // Bold list item if there were changes
let extraInfo = ''
if (b) {
const commitInfo = commitHashes.map(
([shardNumber, commitHash]) =>
`[diff for shard ${shardNumber}](https://github.com/${{ github.repository }}/pull/${{ github.event.pull_request.number }}/commits/${commitHash})`
).join(', ') || "wasn't pushed!"
extraInfo = ` (${commitInfo})`
}
return `- ${b}\`${browser}\`${b}: **${a}** added, **${m}** modified, **${d}** deleted${extraInfo}`
}).join('\n')
github.rest.issues.createComment({
issue_number: context.issue.number,
owner: context.repo.owner,
repo: context.repo.repo,
body: `## 📸 UI snapshots have been updated
**${summaryDiff.total}** snapshot changes in total. **${summaryDiff.added}** added, **${summaryDiff.modified}** modified, **${summaryDiff.deleted}** deleted:
${diffByBrowserDisplay}
Triggered by [this commit](https://github.com/${{ github.repository }}/pull/${{ github.event.pull_request.number }}/commits/${{ github.sha }}).
👉 **[Review this PR's diff of snapshots.](https://github.com/${{ github.repository }}/pull/${{ github.event.pull_request.number }}/files#:~:text=frontend/__snapshots__/)**`
})