sorry if this is a stupid question, but how do I try this out? I ran node with the experimental flag on a file that calls fetch:

node server.js --experimental-fetch

Got 'fetch is not defined' reference error.

This _just landed today_. You can get it by building from master:

```

# there is more details in building.md

git clone https://github.com/nodejs/node

cd node

# may need to pass --openssl-no-asm

./configure

make -j12

./out/Release/node --experimental-fetch

```

Otherwise - wait a bit for the next v17 release to land per the normal release cycle :)