Deno has many built in tools to make your development experience as smooth as possible. One of these tools is the project initializer, which creates a new Deno project with a basic file structure and configuration.
While you are welcome to use JavaScript, Deno has built-in support for TypeScript as well, so we'll be using TypeScript in this guide. If you'd prefer to use JavaScript, you can rename the files to .js and remove the type annotations.
To initialize a new Deno project, run the following command in your terminal:
This will create a new directory called my_project with the following structure:
my_project
├── deno.json
├── main_test.ts
└── main.ts
A deno.json file is created to configure your project, and two TypeScript files are created; main.ts and main_test.ts. The main.ts file is where you'll write your application code, on initial creation it will contain a simple program which adds two numbers together. The main_test.ts file is where you can write tests, initially it will contain a test for your addition program.
You can run this program with the following command:
$ deno main.ts
Add 2 + 3 = 5
Deno has a built in test runner. You can write tests for your code and run them with the deno test command. Run the tests in your new project with:
$ deno test
running 1 test from ./main_test.ts
addTest ... ok (1ms)
ok | 1 passed | 0 failed (3ms)
Now that you have a basic project set up you can start building your application. Check out our examples and tutorials for more ideas on what to build with Deno.
You can learn more about using TypeScript in Deno here.
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