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Access before initialization error from @val/@new #8093

@popstarfreas

Description

@popstarfreas

Rescript v12.0.1

When using @val or @new it seems possible to write rescript code that compiles fine but outputs broken javascript. This seems to have started in v12 due to the change from using var to using let

module X = {
   @val external process: unknown = "process"
}

let process  = X.process

Error:

let process = process;
              ^

ReferenceError: Cannot access 'process' before initialization

Rescript v12.0.1 Output:

// Generated by ReScript, PLEASE EDIT WITH CARE


let X = {};

let process = process;

export {
  X,
  process,
}
/* hello Not a pure module */

Rescript v11.1.4 Output:

// Generated by ReScript, PLEASE EDIT WITH CARE


var X = {};

var process = process;

export {
  X ,
  process ,
}
/* hello Not a pure module */

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