Missing basic DOM types in TypeScript project

Additional answer for testing.

If using mocha, you also need to tell mocha about the DOM environment using jsdom.

https://journal.artfuldev.com/unit-testing-node-applications-with-typescript-using-mocha-and-chai-384ef05f32b2

$ npm install jsdom jsdom-global --save-dev

So your "test" script would add -r jsdom-global/register:

{
  "scripts": {
    "test": "mocha test -r ts-node/register -r jsdom-global/register test/**/*.ts && npm run build"
  }
}

Try adding the following lib section to your tsconfig.json file.

{
    "compilerOptions": {
        "lib": [
            "es2016",
            "dom"
        ]
    }
}

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