TypeScript: parse returns type unknown

[jedkass]

parse clearly returns type JavaScriptValue, which I can see in the types declaration file is:

export type JavaScriptValue = {
    [key: string]: JavaScriptValue;
} | JavaScriptValue[] | JavaScriptPrimitive;

Yet when I call parse, TypeScript is telling me the return type is unknown. If I cast the return value to JavaScriptValue, TypeScript tells me:

(alias) type JavaScriptValue = unknown

Do you know what might be happening here?

[josdejong]

Thanks for your input.

In lossless-json I tried to capture the return type with JavaScriptValue, but it doesn't really work out nicely. The build-in JSON.parse from JavaScript is defined to return any. This makes sense, since a reviver may return anything and you can't really guarantee what will be returned. So, I think best will be to remove JavaScriptValue.

I'm not sure though why TypeScript thinks that parse returns unknown. How can I reproduce your issue?

[josdejong]

I created a PR to improve the types, see #251. Does that make sense @jedkass ?

[josdejong]

I've now published v3.0.0 that has replaced the JavaScriptValue type with unknown.