ReferenceError: Request is not defined about workers-types

[armfazh]

Here it is a solution that worked for me, but I'm using jest.

Include node-fetch in your devDependencies

devDependencies{
+        "node-fetch": "^2.6.1",
}

Add these lines to a mocha setup Javascript file (not TS), or just before your tests.

+ import nodeFetch from 'node-fetch'
+ // Mocking fetch Web API using node-fetch
+ if (typeof fetch === 'undefined') {
+   global.fetch = nodeFetch
+   global.Request = nodeFetch.Request
+ }

you might be tempted to add @types/node-fetch, I tried without success.

[Stono]

Hmm looks like this might be a ts-node problem rather than worker-types TypeStrong/ts-node#711, and I've created TypeStrong/ts-node#1134 to see if anyone has any ideas there.

[xtuc]

If you are running the worker in Node. The Request Object doesn't exists. You can polyfill it using https://github.com/node-fetch/node-fetch#class-request locally to fix that issue.

[threepointone]

The above fix seems about right. But this only patches one global, and you'll have to do the rest of the environment as well. A proper (supported) option is to use miniflare, which is a full simulation of the Workers environment https://miniflare.dev/. Closing this issue.

[waldemarennsaed]

Update 2022:

The above fix worked for me as well.

Please note: Using TS will throw TS errors for not-overlapping types.
Make sure to use a plain setup.js file.