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  • deno.land

    A secure runtime for JavaScript and TypeScript.

A different runtime for running server-side JS. Created by the author of Node.

It has a lot of benefits and doesn’t use node modules and package.json but has its own system.

One day Deno could be the new Node.

Samples

Here we use the denoland/setup-deno action.

Basic

  • main.yml 
      steps:
    - uses: actions/checkout@v2

    - uses: denolib/setup-deno@v2
      with:
        deno-version: v1.x

    - run: |
        deno --version
        deno run https://deno.land/std/examples/welcome.ts
        deno install --allow-read -n deno_cat https://deno.land/std/examples/cat.ts
        deno_cat ./README.md

Format and test

This will:

  • Set up Deno in the environment…
  • Use Deno to check formatting and run tests.

What’s missing is a step build the app - to compile TS to JS and bundle as a single JS file (or binary). That would be useful for distributing a package or making a GH Pages site.

Here is the workflow:

  • main.yml 
      name: Deno CI

  on:
    push:
    pull_request:

  jobs:
    build:
      name: Test app

      runs-on: ubuntu-latest

      steps:
        - name: Checkout repo
          uses: actions/checkout@v2

        - name: Download Deno
          uses: denolib/setup-deno@master
          with:
            deno-version: v1.1.2

        - name: Check format
          run: deno fmt --check

        - name: Run tests
          run: deno test --allow-read --allow-write

Based on the file created for you when adding a new Deno workflow through the GitHub UI.

This will test across two Deno versions and will run on 3 operating systems.

See denoland/setup-deno.

  • deno.yml 
      name: Deno CI

  on:
    push:
      branches: [main]
    pull_request:
      branches: [main]

  jobs:
    test:
      runs-on: ${{ matrix.os }}

      strategy:
        matrix:
          os: [ubuntu-latest, macOS-latest, windows-latest]
          deno: ["v1.x", "nightly"]

      steps:
        - name: Set up repo
          uses: actions/checkout@v2

        - name: Set up Deno
          uses: denolib/setup-deno@c7d7968ad4a59c159a777f79adddad6872ee8d96
          with:
            deno-version: ${{ matrix.deno }}

        - name: Cache Dependencies
          run: deno cache deps.ts

        - name: Run Tests
          run: deno test -A --unstable

A variation without the matrix strategy. And using v2 instead of a commit hash.

  • deno.yml 
      name: Deno CI

  on:
    push:
      branches:
        - main
    pull_request:
      branches:
        - main

  jobs:
    test:
      runs-on: ubuntu-latest

      steps:
        - name: Set up repo
          uses: actions/checkout@v2

        - name: Set up Deno
          uses: denolib/setup-deno@v2
          with:
            deno-version: v1.x

        - name: Cache Dependencies
          run: deno cache deps.ts

        - name: Run Tests
          run: deno test -A --unstable