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README.md

expo-github-action/preview-comment

Add Expo preview comments to pull requests

releases builds license

Usage   —   Outputs   —   Examples   —   Caveats   —   Changelog

What's inside?

This (sub)action allows you to comment on pull requests containing Expo QR codes. It can help speed up the review process by letting the reviewer load the app directly on their phone.

This action only creates the comment. You still have to publish the project.

Configuration options

This action is customizable through variables defined in the action.yml. Here is a summary of all the input options you can use.

variable default description
project - The relative path to the Expo project
channel default On what channel the project was published
comment true If this action should comment on a PR
message see code The message template
message-id see code A unique id template to prevent duplicate comments (read more)
github-token GITHUB_TOKEN A GitHub token to use when commenting on PR (read more)

Available outputs

There are a few variables available to generate the comment content. Some of these variables are also exported as subaction output. Here is a summary of these variables.

output name template name description
projectOwner {projectOwner} The resolved owner of the project
projectSlug {projectSlug} The resolved slug of the project
projectName {projectName} The resolved name of the project
projectLink {projectLink} The expo.dev project link, including release channel
projectQR {projectQR} The QR code link, to load the project in Expo Go
- {channel} The release channel that was used
message - The resolved message content
messageId - The resolved message id content

Example workflows

Before diving into the workflow examples, you should know the basics of GitHub Actions. You can read more about this in the GitHub Actions documentation.

  1. Publish and preview on pull request
  2. Sending preview comments elsewhere

Publish and preview on pull request

This workflow listens to the pull_request event and publishes a to Expo, on release channel pr-#. Once that's done, it will comment with the QR code on that same pull request. It's essential to keep pull requests separated, by release channel, to avoid writing over pull requests.

on:
  pull_request:
    types: [opened, synchronize]
jobs:
  preview:
    runs-on: ubuntu-latest
    steps:
      - name: 🏗 Setup repo
        uses: actions/checkout@v2

      - name: 🏗 Setup Node
        uses: actions/setup-node@v2
        with:
          node-version: 16.x
          cache: yarn

      - name: 🏗 Setup Expo
        uses: expo/expo-github-action@v7
        with:
          expo-version: 5.x
          token: ${{ secrets.EXPO_TOKEN }}

      - name: 📦 Install dependencies
        run: yarn install

      - name: 🚀 Publish to Expo
        run: expo publish --release-channel=pr-${{ github.event.number }} --non-interactive

      - name: 💬 Comment in preview
        uses: expo/expo-github-action/preview-comment@v7
        with:
          channel: pr-${{ github.event.number }}

Sending preview comments elsewhere

You can also use this action to generate the comment without actually commenting. By disabling commenting with comment set to false, you can reuse this action with any workflow trigger and send it to any service accessible in GitHub Actions.

See Available variables for a list of all outputs.

on:
  push:
    branches:
      - main
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: 🏗 Setup repo
        uses: actions/checkout@v2

      - name: 🏗 Setup Node
        uses: actions/setup-node@v2
        with:
          node-version: 16.x
          cache: yarn

      - name: 🏗 Setup Expo
        uses: expo/expo-github-action@v7
        with:
          expo-version: latest
          token: ${{ secrets.EXPO_TOKEN }}

      - name: 📦 Install dependencies
        run: yarn install

      - name: 🚀 Publish preview
        run: expo publish --release-channel=production --non-interactive

      - name: 👷 Create preview comment
        uses: expo/expo-github-action/preview-comment@v7
        id: preview
        with:
          comment: false
          channel: production

      - name: 💬 Comment in Slack
        uses: slackapi/slack-github-action@v1.17.0
        env:
          SLACK_BOT_TOKEN: ${{ secrets.SLACK_TOKEN }}
        with:
          channel-id: deployments
          slack-message: 'New deployment is ready!\n- Preview: ${{ steps.preview.outputs.projectQR }}'

Things to know

Preventing duplicate comments

When automating these preview comments, you have to be careful not to spam a pull request on every successful run. Every comment contains a generated message-id to identify previously made comments and update instead of creating a new comment.

GitHub tokens

When using the GitHub API, you always need to be authenticated. This action tries to auto-authenticate using the Automatic token authentication from GitHub. You can overwrite the token by adding the GITHUB_TOKEN environment variable, or add the github-token input.


with ❤️ byCedric