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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 denolib/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 denolib/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