gha-yarn-cache

1-liner yarn install cache for GitHub Actions

Status and support

• ✔ stable
• ✔ supported
• ✖ no ongoing development

GitHub Action caches improve build times and reduce network dependencies. However, writing the correct cache logic is tricky. You need to understand how the cache action (keys and restore keys) work. Did you know you're not supposed to cache the node_modules folder? The setup is different per OS and takes a lot of space in your workflows. Not anymore!

gha-yarn-cache is a simple 1-liner that covers all use-cases, correctly:

• Caches the Yarn cache directory instead of node-modules as recommended
• Works on Ubuntu, MacOS and Windows
• Restore keys take the OS into account as recommended
• Builds on the native cache functionality of GitHub Actions, same as v2 of the generic cache action

Usage

Add this step before yarn install:

uses: c-hive/gha-yarn-cache@v2

For example:

.github/workflows/ci.yml

name: CI

on: [push]

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1

    - uses: c-hive/gha-yarn-cache@v2
      # with:
        # directory: server # Optional, speficy the folder of yarn.lock if not in the root directory

    - name: Install JS dependencies
      run: yarn install
    - name: Test
      run: yarn test

Solution comparison

Native

- name: Get yarn cache directory path
  id: yarn-cache-dir-path
  run: echo "::set-output name=dir::$(yarn cache dir)"

- uses: actions/cache@v1
  id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
  with:
    path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
    key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
    restore-keys: |
      ${{ runner.os }}-yarn-

gha-yarn-cache

- uses: c-hive/gha-yarn-cache@v2

Conventions

This project follows C-Hive guides for code style, way of working and other development concerns.

License

The project is available as open source under the terms of the MIT License.