EAS Workflows Skill

EAS service - costs apply. EAS Workflows run on Expo Application Services, a paid product with free-tier limits. Each workflow job consumes your plan's build/compute minutes, and jobs that build or submit also need paid Apple Developer and Google Play accounts. Review https://expo.dev/pricing before triggering runs.

Help developers write and edit EAS CI/CD workflow YAML files.

Reference Documentation

Fetch these resources before generating or editing workflow files, or when answering syntax questions. First resolve this skill's directory, then use the fetch script in its scripts/ directory. It is implemented using Node.js and caches responses using ETags for efficiency:

# Fetch resources
node <skill-dir>/scripts/fetch.js <url>

1. JSON Schema, https://api.expo.dev/v2/workflows/schema

   • It is NECESSARY to fetch this schema
   • Source of truth for the workflow YAML structure; EAS CLI remains the authoritative final validator
   • All job types and their required/optional parameters
   • Trigger types and configurations
   • Runner types, VM images, and all enums

2. Syntax Documentation, https://raw.githubusercontent.com/expo/expo/refs/heads/main/docs/pages/eas/workflows/syntax.mdx

   • Overview of workflow YAML syntax
   • Examples and English explanations
   • Expression syntax and contexts

3. Pre-packaged Jobs, https://raw.githubusercontent.com/expo/expo/refs/heads/main/docs/pages/eas/workflows/pre-packaged-jobs.mdx

   • Documentation for supported pre-packaged job types
   • Job-specific parameters and outputs

Do not rely on memorized values; these resources evolve as new features are added.

Workflow File Location

Workflows live in .eas/workflows/*.yml (or .yaml). Each file must be 16 KiB or smaller.

Top-Level Structure

A workflow file has these top-level keys: