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19 Feb 2020 - 03 Jan 2024

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The Wayback Machine - http://web.archive.org/web/20210411104711/https://lab.github.com/githubtraining/github-actions:-writing-javascript-actions

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GitHub Actions: Writing JavaScript Actions

The GitHub Training Team Learn how to write your own GitHub JavaScript Action! This course will empower you to begin automating customized tasks unique to your workflow. Start free course Join 1214 others! social preview

GitHub Actions is a powerful platform that empowers your team to go from code to cloud all from the comfort of your own repositories. Over the duration of this course you will learn the skills needed to begin using and customizing GitHub Actions to fit your unique workflow scenarios.

What you'll learn

In this course you will learn how to: ●Consume actions within a workflow file ●Create custom JavaScript based actions ●Publish your newly created action to the marketplace You'll know the answers to questions like: ●What is a workflow? ●What are actions? ●What is action metadata? ●What are GitHub Actions capable of?

What you'll build

In this course you will build three actions that each accomplish different tasks designed to demonstrate the flexibility of creating and consuming JavaScript Based Actions. First, you will start with the traditional "Hello World!" program which will teach you where to find the output of a workflow run. You will then modify this "Hello World!" action to accept input parameters which allow the action to be more dynamic. Second, you will write an action that call upon an external API to retrieve a fact about cats and prints it to the workflows output. You will then modify this cat fact action to set the retrieved data as output for another action in the workflow to consume. Lastly, you will write a third action that will open an issue in your repository making the cat fact available to everyone. You will learn how to use the output of previous actions as input for current actions in this step.

Prerequisites

We first recommend taking the following courses: ●Hello, GitHub Actions! to learn the basics of how GitHub Actions work ●GitHub Actions: Continuous Integration to dive deeper into a workflow file

Projects used

This makes use of the following open source projects. Consider exploring these repos and maybe even making contributions! ●GitHub Actions Toolkit, a multipurpose JavaScript library for writing actions

Audience

Developers, DevOps Engineers, students, teams

Steps to complete this course 20

Setup a workflow file

Create a pull request to add a workflow

Run a workflow

Wait for GitHub to run the workflow and report back the results

Prep the workflow

Prepare the workflow for your future action

Add an Action reference

Add an Action reference to the workflow file

On to your development environment

Lets prepare your environment to start writing Actions

Creating the Action metadata

Create an action.yml file and add necessary metatdata for our Action

Create the Action entrypoint

Add code to main.js file

Exploring your input parameters

View the results of adding input parameter

Integrating Actions with external APIs

Write a new Action that calls an external API

Prevent the workflow from running

Comment out the lines in the workflow to prevent unwanted runs

Install dependencies for the second action

Create a directory for your new action dependencies

Create your new Action metadata

Add action.yml file for new joke action

Create your Actions JavaScript files

Add joke.js and main.js to your Action

Use the joke Action in a workflow

Edit the workflow file to now use the newly created joke Action

Having Actions tell a joke... or two

Wait for your Action to present you with a joke

Write the final Action

Create an Action that consumes output from another Action and uses Octokit

Add third Actions metadata

Create the metadata for the third Action

Add third Actions JavaScript files

Create the JavaScript files for the third Action

Trigger the third Action

Add a pull request label to trigger the workflow

Wrapping things up

Final notes before you go

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Average time to complete

672 minutes

Free

All public courses on Learning Lab are free.

Get help

Post on the GitHub Community Forum

Latest release

February 23, 2021

Learning Paths that include this course

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byThe GitHub Training Team Learn how to do DevOps on GitHub with the power of GitHub Actions! This path will guide you through...

What is GitHub Learning Lab?

Learn new skills by completing fun, realistic projects in your very own GitHub repository.