Question

A team builds their application across multiple Node.js versions using a matrix. Their workflow currently defines `node: [16, 18, 20]` running on `ubuntu-latest`. They want to add ONE additional job that runs on `windows-latest` with Node.js 20 and also sets an extra variable `experimental: true` that only applies to that single combination, without altering the existing three Ubuntu jobs. Which matrix configuration achieves this?

Accepted Answer

Add an `include:` entry with `{ os: windows-latest, node: 20, experimental: true }` while keeping `node: [16, 18, 20]` and `os: [ubuntu-latest]` in the matrix.

Answer

Add `os: [ubuntu-latest, windows-latest]` to the matrix so both operating systems are combined with all Node.js versions.

Answer

Add an `exclude:` entry with `{ os: windows-latest, node: 20, experimental: true }` to isolate the new combination.

Answer

Set `experimental: [true]` as a top-level matrix key so it multiplies across every existing combination.