End_of_file Exception when compiling



Sometimes i get this error when compiling my ReasonML (ReasonReact) project. After trying 2-3 times, it works without any problems. But this keeps me from running build on my Project because everytime it tries to compile, this error gets thrown with another file.

Does anyone have a solution for this? :open_mouth: Thanks in advance!

Failed to compile.

    at Array.map (<anonymous>)tal error: exception End_of_file
    at <anonymous>

bs-platform: 4.0.0 (updated today, hat the same with 3.1.5)
reason-react: 0.4.2
bs-loader: 2.0.5 (reason-scripts 0.9.0)


What do you mean by ‘trying 2-3 times’? What did you try?

Could you share what’s going on in login.re?

I don’t think this is the cause for compilation to fail, but your file name should be capitalized.


Sorry, compiling 2-3 Times. (Saving a file to trigger a new compile or Running yarn start again)

I cannot share the complete file. But it is always different file that throws the error. Kind of random. i have like 15 .re files. Ill try to recreate the behaviour with some example files that i can share with you. Im also going to use the uppercase file nameing.
I guess it must be a package im using in this project.

(Also the Login.re file does not have a line with „Array.map…“ :thinking:)


Hmm…that is strange! Could your build be stale? Have you tried cleaning your build?


i just tried that and it did not help :frowning:

Just as an example it just threw the error with my Client.re file which contains only the following:

/* Create an InMemoryCache */
let inMemoryCache = ApolloInMemoryCache.createInMemoryCache();

/* Create an HTTP Link */
let httpLink =
        object_([("Content-Type", Js.Json.string("application/json"))])

let instance =
  ReasonApollo.createApolloClient(~link=httpLink, ~cache=inMemoryCache, ());


I have the exact same problem. It will also give different filenames on every “save” of any random file. When it has walked through ~5 of these errors after ~5 “saves” it compiles successfully.
I’m also on version 3 of bs-platform, tried updating to patches and minors, didn’t solve the issue.
I also found this github issue with no fix as well :frowning: https://github.com/reasonml-community/bs-loader/issues/2

Was thinking about removing all bs-* dependencies and reinstalling.

Probably a coincidence, but I also use Apollo and have code similar to yours in my Client.re. (But the error isn’t always on Client.re)


Thats really strange…

I tried everything today (reinstalling dependencies, checking version, use another bs-platform version, create new project and add old stuff one by one), i cannot figure out when/what goes wrong.

Btw. bsb -make-world completes everytime without any problems… :open_mouth:

This is where the build process “crashes”, but i dont think its very helpful:

3 verbose stack Error: client@0.1.0 build: `react-scripts build`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:304:16)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at EventEmitter.emit (events.js:214:7)
13 verbose stack     at ChildProcess.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at ChildProcess.emit (events.js:214:7)
13 verbose stack     at maybeClose (internal/child_process.js:925:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)


I have been using create-react-app with reason-scripts. I now migrated my project to bsb -init my-react-app -theme react- Method (https://reasonml.github.io/reason-react/docs/en/installation.html). Its working way better and faster now. i dont think it is a create-react-app issue in general… But maybe it will help you to @happylinks


That fixed my problem as well! Thanks for the tip :smiley:

Wondering what causes this in react-scripts :thinking:


This is a known issue in reason-scripts for a while now :confused: I’ve never been able to get a consistent reproducible case of it, but it’s just unfortunately bad.

As far as the “Array.map” thing, that’s another weird case.


For anyone still facing this issue, according to some posts in Discord it looks like Parcel is the recommend replacement to Create React App.

This blog goes over how to set this up: https://dev.to/scastiel/bootstrap-a-reason-react-project-with-parcel--13fj.


I experienced the same issues and so ported over my stuff to Razzle: https://github.com/jaredpalmer/razzle/tree/master/examples/with-reason-react