FHIR / FHIR/GoFSH

Error: Could not process ValueSet at node_modules/kbv.basis/KBV_VS_Base_Diagnosis_SNOMED_CT.json: Maximum call stack size exceeded

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Langage dominant
TypeScript
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40
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Description

I tried running

```
npm install gofsh
npm --registry https://packages.simplifier.net install kbv.basis@1.3.0
node node_modules/.bin/gofsh node_modules/kbv.basis/ --out gofish_output --dependency de.basisprofil.r4@1.3.2
```

This produces an error
```
...
info Processed 10 of 40 ValueSets...
error Could not process ValueSet at node_modules/kbv.basis/KBV_VS_Base_Diagnosis_SNOMED_CT.json: Maximum call stack size exceeded
info Processed 15 of 40 ValueSets...
...
```

Turns out the problem lies in this line

https://github.com/FHIR/GoFSH/blob/9895cdcba8f90ef2357d6cbfefb386bc4773d4ef/src/processor/ValueSetProcessor.ts#L44-L47

The size of an array that can be destructured into an argument list is limited by JavaScript. In my case the array has 466433 elements. Try it yourself in a node REPL.

```
[].push(...Array.from({ length: 400_000 }))
```

You will get a `RangeError: Maximum call stack size exceeded` because it cannot handle a function call with 400k arguments. Fortunately the fix for this is straight forward by not using Array.push:

```ts
const newRules: ExportableValueSet['rules'] = [
...CaretValueRuleExtractor.processResource(input, fisher, input.resourceType, config)
];
```

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