Gives error "Only absolute URLs are supported" even though the URL is absolute

I did

require('node-fetch')('http://localhost:3000/')

and it gave me an error: TypeError: Only absolute URLs are supported

Reproduction

Steps to reproduce the behavior:

1. Get node version 15.2.1
2. run npm install node-fetch@2.6.1
3. run node -p "require('node-fetch')('http://localhost:3000/')"

Expected behavior

I expected it to run fine without any errors and return the response. https://www.npmjs.com/package/node-fetch#fetchurl-options

Your Environment

software	version
node-fetch	2.6.1
node	15.2.1
npm	6.14.8
Operating System	Windows 10 v2004 build 19041.630

Additional context

[tbrannam]

I have had a similar issue, and the problem was multiple versions of node-fetch. In my case I was running in a monorepo and the test app and the support packages resolved to different node_modules folder. Somewhere deep in the implementation there is a check against a JS symbol which would not match in this case.

[pavelloz]

I have the same issue (for a long time, i just didnt write about it) when trying to build project with routify which depends on node-fetch. Whats weird, it works when i start i dev mode (and thats how i work around the issue… i just dont build, i leave project in dev mode forever).

It looks like a lot of people are waiting for it to be resolved: https://github.com/mailgun/mailgun-js/issues/118

node-fetch: 2.6.1 node: v16.11.0 npm: 8.0.0 macos: 10.15.7