[build-tools] Add read app config and package.json functions

[gwdp]

Why

Needing to add this information in the fingerprint job and thought about creating reusable steps that we can add into others as needed.

Ref ENG-20510

How

Creating 2 new functions that reuse existing utils functions to leverage SDK check and standard error messages.
Export app config basic values so devs can leverage it to get slug, name and version.

Test Plan

• eas-cli yarn build
• workflow-orchestration process-compose up
• www yarn start:docker (impersonate staging first)
• website yarn start:local
• EXPO_LOCAL=1 npx eas-cli@latest workflow:run fingerprint-test.yml on

name: fingerprint-test

on:
  push:
    branches: ["main"]

jobs:
  project_metadata:
    name: Read project metadata
    type: custom
    runs_on: linux-medium
    environment: preview
    env:
      APP_VARIANT: preview
    outputs:
      app_config: ${{ steps.read_app_config.outputs.app_config }}
      package_json: ${{ steps.read_package_json.outputs.package_json }}
    steps:
      - uses: eas/checkout
      - uses: eas/install_node_modules
      - id: read_app_config
        uses: eas/read_app_config
      - id: read_package_json
        uses: eas/read_package_json
      # inline read
      - run: |
          APP_CONFIG='${{ steps.read_app_config.outputs.app_config }}'
          PACKAGE_JSON='${{ steps.read_package_json.outputs.package_json }}'
          echo "app_config output length: ${#APP_CONFIG}"
          echo "app_config output: ${APP_CONFIG}"
          echo "package_json output length: ${#PACKAGE_JSON}"
          echo "package_json output: ${PACKAGE_JSON}"
          node -e "JSON.parse(process.argv[1]); JSON.parse(process.argv[2]); console.log('Step outputs are readable JSON.')" "$APP_CONFIG" "$PACKAGE_JSON"

  verify_project_metadata_outputs:
    name: Verify project metadata outputs
    type: custom
    runs_on: linux-medium
    needs: [project_metadata]
    steps:
      - run: |
          APP_CONFIG='${{ needs.project_metadata.outputs.app_config }}'
          PACKAGE_JSON='${{ needs.project_metadata.outputs.package_json }}'
          echo "project_metadata.app_config: $APP_CONFIG"
          echo "project_metadata.package_json: $PACKAGE_JSON"

  fingerprint:
    name: Fingerprint
    type: fingerprint
    environment: preview
    env:
      APP_VARIANT: preview

  verify_fingerprint_job_outputs:
    name: Verify fingerprint job outputs
    type: custom
    runs_on: linux-medium
    needs: [fingerprint]
    steps:
      - run: |
          APP_CONFIG='${{ needs.fingerprint.outputs.app_config }}'
          PACKAGE_JSON='${{ needs.fingerprint.outputs.package_json }}'
          ANDROID_FINGERPRINT_HASH='${{ needs.fingerprint.outputs.android_fingerprint_hash }}'
          IOS_FINGERPRINT_HASH='${{ needs.fingerprint.outputs.ios_fingerprint_hash }}'
          echo "fingerprint.app_config: $APP_CONFIG"
          echo "fingerprint.package_json: $PACKAGE_JSON"
          echo "fingerprint.android_fingerprint_hash: $ANDROID_FINGERPRINT_HASH"
          echo "fingerprint.ios_fingerprint_hash: $IOS_FINGERPRINT_HASH"

Produced the Following

• Failure test was done through manually crafted exception in the readPackageJson and readAppConfig (since uploading invalid ones weren't possible with the cli). Result is the following (no job failure as expected; Error message will be accordingly to failure. Seeing `test due to manually introduced exception for that test):

[gwdp]

x-ref https://github.com/expo/universe/pull/26398

[linear]

ENG-20510 Show app config and package.json on fingerprint job

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.84%. Comparing base (3155fc2) to head (d94cb76).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3585      +/-   ##
==========================================
+ Coverage   54.80%   54.84%   +0.04%     
==========================================
  Files         834      836       +2     
  Lines       35855    35886      +31     
  Branches     7487     7488       +1     
==========================================
+ Hits        19648    19679      +31     
  Misses      16112    16112              
  Partials       95       95              

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[EvanBacon]

Same as npx expo config --type public --json

[gwdp]

Thanks for the early feedback @EvanBacon — I ended up using readAppConfig here because it handles SDK-version differences and includes some resiliency/fallback behavior. If you’d prefer the simpler path, I can switch this to a direct CLI call. Thoughts?

[github-actions]

Subscribed to pull request

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[github-actions]

✅ Thank you for adding the changelog entry!