Expose the ability to run packager on custom port

[axemclion]

The packager hostname would be configurable using REACT_NATIVE_PACKAGER_HOSTNAME. Would be great to have it specify a port too.

Today, an open port above 19001 is used and the packager is started there. However, there may be firewall rules that may prevent incoming connections to that port. Making it configurable would help.

Progress on this?

[VincentKLX]

My firewall block me too, and a custom port is a good idea.
Something new about it ?

[brentvatne]

A PR to support this would be very welcome :)

[sladec]

Need this option to run on Cloud9 IDE http://c9.io, they only allow port 8080/1/2

[nickcarenza]

Make a .exprc file like this with whatever port you want.

{
	"manifestPort": 8000
}

It seems to be an undocumented config file.

[grange74]

Adding manifestPort to a .exprc file as suggested above seems to change the expoServerPort from its default of 19000. Still not sure how to change packagerPort from default 19001.
Also tried running npm start -- --port=8081 but that doesn't seem to help.

[murugaratham]

this is a really great addition, my corporate network guys do not like opening ports and exactly like what @axemclion said, CRNA already have a environment value that let us configure hostname, what about port?

[fson]

The Metro bundler port is currently configurable through the expo.packagerOpts.port property in app.json, e.g.:

{
  "expo": {
    "sdkVersion": "25.0.0",
    "packagerOpts": {
      "port": 8787
    }
  }
}

[dawnmist]

@fson Your solution does not work, because expo doesn't reset its auto-created port to what is in the app.json file prior to starting the packager.

Packager port is set here:
https://github.com/expo/xdl/blob/ec7560e3d884afa02f728ac30a4a7f3a20ad2200/src/Project.js#L1088

User settings is set here:
https://github.com/expo/xdl/blob/ec7560e3d884afa02f728ac30a4a7f3a20ad2200/src/Project.js#L1107-L1124

And they use the packagerPort variable directly without having checked for user settings to have changed it when creating the server here:
https://github.com/expo/xdl/blob/ec7560e3d884afa02f728ac30a4a7f3a20ad2200/src/Project.js#L1167-L1170