Contributing

Development

Instructions on how to build from source can be found here.

Submitting a Pull Request

Before submitting, please make sure the following is done:

  1. That there is a related issue and it is referenced in the PR text.
  2. There are tests that cover the changes.
  3. Ensure cargo test passes.
  4. Format your code with ./tools/format.py
  5. Make sure ./tools/lint.py passes.

Changes to third_party

deno_third_party contains most of the external code that Deno depends on, so that we know exactly what we are executing at any given time. It is carefully maintained with a mixture of manual labor and private scripts. It’s likely you will need help from @ry or @piscisaureus to make changes.

Adding Ops (aka bindings)

We are very concerned about making mistakes when adding new APIs. When adding an Op to Deno, the counterpart interfaces on other platforms should be researched. Please list how this functionality is done in Go, Node, Rust, and Python.

As an example, see how Deno.rename() was proposed and added in PR #671.

Releases

Summary of the changes from previous releases can be found here.

Documenting APIs

It is important to document public APIs and we want to do that inline with the code. This helps ensure that code and documentation are tightly coupled together.

Utilize JSDoc

All publicly exposed APIs and types, both via the deno module as well as the global/window namespace should have JSDoc documentation. This documentation is parsed and available to the TypeScript compiler, and therefore easy to provide further downstream. JSDoc blocks come just prior to the statement they apply to and are denoted by a leading /** before terminating with a */. For example:

  1. /** A simple JSDoc comment */
  2. export const FOO = "foo";

Find more at https://jsdoc.app/